HUMIDITY / TEMPERATURE MEASUREMENT - Omni Instruments

1 

HUMIDITY / TEMPERATURE 

M E A S U R E M E N T 

2 0 0 2 / 2 0 0 3 

UK / Europe / USA Office 

Tel: +44 (0)8700 434040 

Fax: +44 (0)8700 434045 

E-mails - info@omniinstruments.co.uk 

East Kingsway Business Centre 

Mid Craigie Trading Estate 

Mid Craigie Road,Dundee DD4 7RH UK

Rotronic have been manufacturers of humidity instruments since 1967. Our products have been 

developed over the years to provide accurate and dependable measurements in a wide range of applications, 

at competitive prices, and with features which our customers appreciate. Throughout this 

catalogue, you will fi nd a range of units which solve the measurement requirements in almost any 

application. 

All products are developed and manufactured at our headquarters in Switzerland, where we maintain 

an ISO9001 quality system, as well as an accredited calibration laboratory, and a full repair facility. 

We have a worldwide network of subsidiary companies and distributors, who are highly trained 

to support the ROTRONIC product range. 

When you specify a ROTRONIC product, you can expect: 

ROTRONIC – The Company 

• High accuracy sensing technology. 

• Excellent long term measurement stability. 

• Sensors with a high resistance to condensation and chemical pollution. 

• Full calibration adjustment facilities. 

• Traceable humidity calibration standards. 

• Expert product support throughout the life of the product 

Many famous international organisations place their trust in ROTRONIC measurement systems, our 

customer list includes: 

SIEMENS DEUTSCHER WETTERDIENST NASA 

BARILLA HONEYWELL 

NOVARTIS INTEL ROCHE 

AGFA-GEVAERT NESTLÉ 

MÉTÉO FRANCE BAYER HOFFMAN-LA-ROCHE 

PROCTER & GAMBLE KNORR 

JOHNSON CONTROL PHILIP MORRIS HEWLETT PACKARD 

KODAK CLARIANT 

I 

N 

T 

R 

O 

D 

U 

C 

T 

I 

O 

N 

1

I 

N 

T 

R 

O 

D 

U 

C 

T 

I 

O 

N 

2 

ROTRONIC Technology 

The measurement of humidity is a complex science, and over many years we have continuously developed 

our products to provide higher precision, better long term stability and the features our customers 

demand. There are certain core technologies which are common to many of our products, and which differentiate 

ROTRONIC instruments from many alternatives on the market: 

Hygromer ® Sensor. 

The Hygromer sensor was fi rst introduced in 1979 in response to market 

demand for higher performance and lower costs. Since its launch, 

it has constantly been developed using the highest quality materials 

and the state-of-the-art production techniques. 

Today it still has the widest operating range of any %rh sensor on the 

market, working over the ranges of 0…100 %rh and –50…200 °C. It’s 

superb reputation for long term stability is second to none, and many 

examples can be seen in use after more than 20 years. It is also able to 

withstand exposure to condensation without affecting calibration. 

The Hygromer ® sensor is used in every product carrying the 

ROTRONIC brands HYGROMER ® and HYGROCLIP ® . Several versions 

are available with different characteristics, see page 109 for more information. 

The HygroClip ® Concept. 

HygroClip ® is a humidity and temperature measurement concept 

utilising an exclusive digital semiconductor technology. It is based 

on a custom ASIC*, designed specifi cally for humidity and temperature 

measurement applications and works in conjunction with the 

Hygromer sensor. 

Products based on HygroClip ® technology include features such as 

probe interchangeability, digital signal processing, digital calibration 

and much more. 

HygroClip technology is used in every product carrying the ROTRONIC 

HYGROCLIP ® brand. 

* Application Specifi c Integrated Circuit 

Custom Mechanical Components 

The precise measurement of humidity needs careful consideration of 

temperature. Even the best humidity sensor and electronics cannot 

compensate for mechanical components that do not respond quickly 

to temperature changes. 

Our in house design team have therefore created a range of custom 

mechanical components which provide the best combination of mechanical 

strength and optimum thermal properties to ensure that sensors 

have the best possible chance of accurate measurements. 

Compensation 

Hygrometers are usually only factory adjusted at ambient temperature, 

so ROTRONIC humidity instruments feature dynamic temperature 

compensation to ensure that measurement values are optimised 

across the entire working range. Even if you purchase a transmitter 

that measures humidity only, you will fi nd a temperature sensor integrated 

into the probe for this purpose. Our SCS laboratory can provide 

calibrations at higher or lower temperatures if required. 

Thanks to the use of the latest digital technology, ROTRONIC humidity 

instruments can also be specifi ed to include dynamic pressure compensation.

Contents 

Section Products: Page number range: 

Handheld Instruments HygroPalm, HygroClip probes, A1, GTS 4 - 13 

Dataloggers HygroLog, HygroClip probes, Agent D, Agent probes 14 - 25 

Transmitters HygroFlex, M-Series, Roline-L Series 26 - 67 

Meteorology MP100/400, MP100/400H, Mounting hardware 68 - 75 

Water Activity HygroLab, Aw Quick, AW-DIO, HygroClip probes 76 - 87 

Temperature Temperature Transmitters and Handhelds 88 - 91 

OEM Products HygroClip, OEM options 92 - 95 

Calibration SCS calibration standards, calibration devices 96 - 99 

HW3 Software Features and options 100 - 103 

Theory Sensors, defi nition, pollutant tables 104 - 110 

Index 111 

I 

N 

T 

R 

O 

D 

U 

C 

T 

I 

O 

N 

3

H 

A 

N 

D 

H 

E 

L 

D 

I 

N 

S 

T 

R 

U 

M 

E 

N 

T 

S 

4 

Handheld Instruments 

Measurement of humidity and temperature is essential in many production, storage, transportation, and 

test applications. Many processes can only be performed if humidity and temperature conditions are within 

a specifi c range. Materials and products do not perform correctly if climatic conditions are incorrect. 

The ROTRONIC handheld instruments are the perfect tool for portable measurements, which are the fi rst 

step to defi ne ambient conditions. 

Our range of handheld instruments are highly accurate, but are easy to use and maintain. Confi guration 

and programming is performed in the factory; however, certain models offer the possibility to alter the 

instrument programming to specifi c customer needs with user-friendly software or integrated keypad. 

A wide range of interchangeable probes means simple maintenance and application fl exibility. 

Key features 

• Accuracy and long term 

stability 

• Interchangeable digital sensor 

module 

• Compact, modern instruments 

• Large display with good contrast 

• HOLD Function 

• Wide range of probes 

• Battery powered 

Your benefi ts 

� Reliable data and reduced 

maintenance 

� Simple calibration & maintenance 

� Easy to use and handle 

� Clear observation of measured values 

� Reliably capture of measured values 

� One instrument – many applications 

� Suitable for use anywhere 

Section contents Page 

HygroPalm Handheld Instruments for HygroClip probes 6 to 7 

� Interchangeable probes 

� Large easy-to-read display 

� Optional Docking Station 

� Temperature adaptors 

� RS232 Interface 

HygroClip probes for HygroPalm Handhelds 8 to 9 

� Wide range of options to suit any application 

� 0…100%rh, -50…200 °C 

� 100% interchangeable without adjustment 

Accessories and Sets of HygroPalm Instruments 10 

� Complete equipment for measuring and calibration 

� Handy cases 

� Connecting cables 

A1 and GTS Instruments for Special Applications 11 

� Handheld for paper stacks 

� Sets including calibration material

Building Management / HVAC 

Accurate and reliable thermohygrometers 

are needed to verify 

correct system performance 

during commissioning. Rotronic 

handhelds and their ability to be 

calibrated on-site often settles 

disputes about whose instrument 

is correct! 

Climatic test cabinets 

Many products are tested over 

a variety of climatic conditions. 

The exceptionally wide measuring 

range of the ROTRONIC 

handheld units means these 

conditions can be easily spot 

checked. 

Paper Industry 

The fi rst ROTRONIC products 

were developed for the paper 

industry, and today we have 

the largest world-wide sales of 

sword hygrometers for paper 

stack monitoring. 

Handheld Applications 

Research 

Many research tests must have 

the humidity conditions defi ned 

for the results to be accepted or 

considered to be reliable. 

Health and Fitness Centres, 

Hospitals, Classrooms 

In public areas it is especially 

important to maintain correct 

humidity values to minimise 

health risks. 

Museums, libraries & 

art galleries 

Conservation applications 

require dependable measurements 

and low cost of ownership. 

Rotronic handhelds have 

been a mainstay in this markets 

for three decades. 

Warehouses & storage 

Many products need to be stored 

in certain conditions to remain in 

good condition. 

Industrial process monitoring 

The maximum measurement 

temperature of 200°C and the robust 

design of our probes means 

that even the most diffi cult process 

application can be checked 

with a ROTRONIC handheld. 

H 

A 

N 

D 

H 

E 

L 

D 

I 

N 

S 

T 

R 

U 

M 

E 

N 

T 

S 

5

H 

A 

N 

D 

H 

E 

L 

D 

I 

N 

S 

T 

R 

U 

M 

E 

N 

T 

S 

6 

HygroPalm Series 

Humidity and Temperature Display Instrument for digital HygroClip ® probes 

HygroPalm represents a new generation of portable humidity/temperature instruments utilising the very 

latest digital technology. The advantage of digital technology is clear; highest precision is assured thanks 

to data transmission in a digital form, which means no signal loss over extended cable lengths and no external 

interference can infl uence measured values. Calibration data is maintained within the probe, which 

means there is no need to calibrate the whole system, and probes can be interchanged in seconds. 

HygroPalm 1 

Key features: 

• Handheld display unit for humidity and temperature 

• Digital signal processing for maximum accuracy 

• Display of dew point or wet bulb temperature 

• Standard alkaline batteries used 

• Interface for HygroFlex Transmitters 

• One-point adjustment of probes 

• Operating range probes: -50…200°C, probe dependent 

Order code: 

HygroPalm 1 (probe must be ordered separately) 

HygroPalm 2 

Key features: 

• All functions of HygroPalm 1 

• Second probe input %rh and °C 

• Multiple point probe adjustment 

• RS232 PC interface 

• Calculation of various psychrometric parameters 

• Formula Editor 

Order code: 


HygroPalm 3 

Key features: 

• All functions of HygroPalm 2 

• Universal input for pressure, air-speed etc. 

• Dynamic pressure compensation 

• Bi-directional interface for HygroFlex transmitters 

• Formula Editor 

Order code: 


PalmDock Docking Station 

Benchtop docking station designed for use with all HygroPalm models 

for RS232* PC interface and power connection (with external power 

adaptor). 

* HygroPalm 1 does not feature RS232 interface. 

Order code: 

PD 1 without lock 

PD 2 with lock 

PalmDock-1 with HW3 Software* & datacable, without lock 

PalmDock-2 with HW3 Software, datacable, & lock 

AC1207 Power adapter 

* Further information in the chapter HW3 Software

Feature Overview 

Highly precise & stable humidity 

& temperature sensors 

Big display 

for easy readings 

HOLD function 

for display 

5-button keypad for 

easy operation 

Battery 

compartment 

HygroPalm 

Interchangeable probes 

Calibration can be updated or the 

range of applications changed 

by the simple connection of a 

different probe. 

Interface Connector 

for HygroFlex Transmitter 

Universal Probe Input 

Psychrometric 

calculations available 

Option: Lock 

Docking Station 

Socket for Power adaptor 

RS232 interface 

for use with a PC 

H 

A 

N 

D 

H 

E 

L 

D 

I 

N 

S 

T 

R 

U 

M 

E 

N 

T 

S 

7

H 

A 

N 

D 

H 

E 

L 

D 

I 

N 

S 

T 

R 

U 

M 

E 

N 

T 

S 

8 

HygroClip Probes for HygroPalm 

A range of probes for different applications are available for the HygroPalm display instruments. 

All probes are based on the digital HygroClip technology, and can be interchanged within seconds without 

need for recalibration. With special adaptor cables, even probes designed for transmitters may be used. 

HygroClip S/S1 

Standard sensor module for humidity and temperature. 

A wire mesh fi lter provides sensor protection against dust and 

high air velocity. 

Dimensions Ø15 x 100 mm. IP rating: IP65 

HygroClip S1 is specially calibrated and certifi ed to provide measurement 

accuracy of ±1 %rh. 

Measurement range: -40…85 °C , 0…100 %rh 

Accuracy (S1): ±1.0 %rh, ±0.2 K (at 23 °C) 

Accuracy: ±1.5 %rh, ±0.3 K (at 23 °C) 

Order code: 

HygroClip S1 

HygroClip S 

Ø: 15 mm Length: 100 mm 

HygroClip SC04 / SC05 

4/5 mm diameter cable probe for humidity and temperature measurements 

in small spaces such as product & packaging testing, concrete, 

electronic test and climatic chambers. 

Cable length 2m 


Accuracy: ±1.5 %rh, ±0.3 K (at 23°C) 

Order code: 

HygroClip SC04 4 mmØ probe 


Ø: 4/5 mm Cable: 2 m 

HygroClip HK 25 /HK40 

High temperature probe for measurements in ducts, dryers, 

climatic chambers etc. Probe length 250 or 400 mm. 

Measurement range: HK25: -50…150 °C, 0…100 %rh 

HK40: -50…200 °C, 0…100 %rh 


Order code: 

HygroClip HK25 (250 mm probe, max.150°C) 

HygroClip HK40 (400 mm probe, max. 200°C) 

Ø: 15 mm Probe length: 250 mm/400 mm Cable: 2 m

HygroClip SP05 

Fast response 5 mm diameter insertion probe with laser cut air slots 

for bulk goods such as corn, wheat, & granules. Also suitable for 

measurements in concrete and brick. Not suitable for powders. 

Probe length 200 mm. 

Measurement range: -40…85°C , 0…100 %rh, 

Accuracy: ±1.5 %rh , ±0.3 K (at 23°C) 

Order code: 


Ø: 5 mm Probe length: 200 mm Cable: 2 m 

HygroClip HP28 

Robust 10 mm diameter tubular probe for measurements in bulk 

products such as powders & granules. 

Probe length 280 mm, 2m cable, steel sinter fi lter. 

Measurement range: -40…85°C, 0…100 %rh 


Order code: 



HygroClip HS28 Sword Probe 

For measurements in paper stacks/rolls. Lightweight, yet robust 

aluminium blade for fast temperature and humidity equilibrium. 

Blade 280 x 18 x 4 mm. 

Measuring range: -40…85°C, 0… 100 %rh 


Order code: 

HygroClip HS28 

Sword length: 280 mm Cable: 2 m 

HygroClip Probes for HygroPalm 

H 

A 

N 

D 

H 

E 

L 

D 

I 

N 

S 

T 

R 

U 

M 

E 

N 

T 

S 

9

H 

A 

N 

D 

H 

E 

L 

D 

I 

N 

S 

T 

R 

U 

M 

E 

N 

T 

S 

10 

Handheld Sets and Accessories 

Measuring instruments often need to be transported around site, and in some cases from building to 

building. We have created a series of handheld measurement sets which securely contain most commonly 

used standard equipment and accessories. Carry cases are also useful for storing instruments when not 

in use, and help to maintain long-term stability by protecting the units from climatic variations or contamination 

in storage conditions. 

HygroPalm 1 Set 

Consists of: 

• HygroPalm 1 Handheld Instrument 

• HygroClip-S probe 

• Calibration device ER15, fi tting for HygroClip-S 

• Humidity standards 50 %rh EA50-SCS 

• Robust carrying case AC1116 

Order code: 

HygroPalm 1-Set 

HygroPalm 2-Set-HS28 

Consists of: 


• HygroClip-HS28 probe 

• Calibration device EGS, fi tting for HygroClip-HS28 



• Software HW3 

• Connection Cable 

Order code: 

HygroPalm 2-Set-HS28 

HygroPalm 3-Set-PC 

Consists of: 


• HygroClip S probe 

• Calibration device ER15, fi tting for HygroClip-S 



• Software HW3 

• Connection Cable AC1622 

Order code: 

HygroPalm 3-Set-PC 

Temperature adaptor for Pt100 probes 

The HygroPalm can also handle Pt100 probes with standard Binder 

connector, see page 89 for a range of compatible Pt100 probes. 

Order code: 

HygroClip-TH100-B5 

Windspeed probe Mini Air6 Micro 

Mini Air 6 can be connected to HygroPalm 2 & 3 types 

as well as to data loggers and industrial transmitters. 

Measuring range: 0.5 – 20 m/s 

Temperature range: -10…80°C 

Output signal: 0 – 2.0 V 

Head-Size: Ø11 x 15 x 165 mm 

Cable length: 5 m 

Order code: 

MiniAir6 Micro 20M/s 

Other windspeed probes available on request 

Suitable for: 

HVAC technicians, supervisors 

Suitable for: 

Paper processing industry, any 

user of cut-sheet material 

Suitable for: 

Users who want to record 

measured values on a PC and 

calibrate their probes.

GTS and GTS-Set 

The GTS is a classic ROTRONIC product which has stood the test on time. 

It was designed specifi cally for the measurement of humidity and temperature within stacks of paper, 

cardboard or any other cut-sheet material. 

The robust design in combination with updated electronics make the GTS the most popular instrument 

for paper and card applications. 

GTS – for paper and cardboard stacks 

• Display of relative humidity or temperature 

• Simple one button operation 

• Auto power off function 

• Low-battery indicator 

Order code: 

GTS 

GTS – Set-Measurement set for cut-sheet material 

includes: 

GTS instrument 

Robust carrying case 

Calibration device EGS 

Humidity standards EA50-SCS 

(5 ampoules 50 %rh with SCS certifi cate) 

Adjustment tool 

Order code: 

GTS-Set 

Carrying case for GTS, without instrument 

Order code: 

AC1102 Case (without accessories) 

A1 for air measurement 

Another classic design which we retain thanks to continuing demand 

from our customers. 

• Reference probe for relative humidity and temperature 

• Integrated climate probe with adjustable position 

• Large, clear display 

• Simple operation 

• Hold function 

• Auto power off 

• Battery status indicator 

• Battery or accumulator operation 

• Temperature Display in °C or °F 

Order code: 

A1 

Accessories for the A1 

• Robust and handy carry case for A1 instruments plus accessories. 

• Calibration device EGL (see page 98) 

• Calibration standards (see page 97) 

Order code: 

AC1115 Case (without accessories) 

H 

A 

N 

D 

H 

E 

L 

D 

I 

N 

S 

T 

R 

U 

M 

E 

N 

T 

S 

11

H 

A 

N 

D 

H 

E 

L 

D 

I 

N 

S 

T 

R 

U 

M 

E 

N 

T 

S 

12 

Technical Data Summary 

Features HygroPalm 1 HygroPalm 2 HygroPalm 3 A1 GTS 

Humidity sensor Hygromer ® HygroClip-S probes with Hygromer ® AC-1 Sensor AC-1 

Temperature sensor Pt100 1/3 DIN Pt100 B 

Probe connections (combined %rh/°C) 1 2 Integrated probe 

Signal input 

1 digital 2 digital 

2 digital or 

4 analogue 

Third party probe input No 0…2.5 V 

Supply for 3 rd party probe No 9 V / 10 mA No 

RS232 Interface No Yes No 

Display Humidity 

3-digit LCD 3-digit LCD 

3-line alphanumeric LCD 

Temperature 3 1⁄2 digit LCD (%rh or ° C) 

Display units %rh, °C, °F, calculated param. Freely select. %rh, °C, °F %rh, °C, °F 

Resolution 0.1%rh/ 0.1°C 0.1%rh/0.1°C 0.1%rh/0.1°C 

Probe adjustment 

1 point %rh, °C By Keypad By potentiometer 

4-point %rh, 2 point °C No By Keypad and Software No 

3-point %rh, T min./Tmax. N/A 35 / 80 / 10 % No 

2-point %rh, Tmin / Tmax N/A 35 / 80% 

Calculation & unit display 

Dew-point and wet bulb temperature Yes No 

Full psychrometric calculation No Yes No 

Pressure compensation No manually dynamically 

of calculated values adjustment with Software with pressure No 

probe input 

Humidity displayed in Aw units No Yes No 

Formula Editor No Yes No 

Remote Transmitter Control 

Transmitter adjustment No Yes No 

Transmitter adjustment 

against reference probe 

No Yes No 

Transmitter measurement display Yes No 

Transmitter status display No Yes No 

Operating ranges of electronics 

Humidity/Temperature 

Measuring ranges 

Measuring ranges (probes) 

Accuracy at 23 °C 

0…100 %rh, non condensing / -10…60°C 

Probe dependent 0…100 %rh / -50…200°C 

±1.5 %rh/ ±0.3 K 

Reproducibility < 0.5 %rh / < 0.1 K 

Long Term Stability < 1 %rh / Year 

Power Supply 

9 V PP3 alkaline battery Yes 

0…100 %rh 

-10…50°C 

5…99.9 %rh / 5…99.9 %rh 

-25…75°C -10…50°C 

±1.5 %rh / (±2.5 90%) 

±0.3 K 

9V Accumulator Yes No Yes 

230 V External supply voltage Optional, only with Docking Station No 

Type of enclosure / IP Rating IP 50 

Housing material ABS 

Dimensions in mm 295 x 70 x 35 190 x 63 x 26 420 x 70 x 40 

Weight ca. 200 g ca. 170 g ca. 400 g

GTS 

A1 

62.8 

27 

HygroPalm 

57 

150 

~40 

RH 

°C 

65 

191 167 

A1 

Dimensional Diagrams 

40 

18 

260 

5 

ø10 

H 

A 

N 

D 

H 

E 

L 

D 

I 

N 

S 

T 

R 

U 

M 

E 

N 

T 

S 

13

D 

A 

T 

A 

L 

O 

G 

G 

E 

R 

S 

14 

Dataloggers 

Long term recording of humidity and temperature measurements is essential in many production, storage, 

transportation, display and test applications. They provide valuable information on the levels and variation 

of humidity and temperature which can have a signifi cant impact on people, materials and objects. 

The ROTRONIC range of data loggers and recorders are highly accurate and stable, but are easy to use 

and maintain. Confi guration and programming can easily be performed by any operator, with user-friendly 

software or integrated keypads. Data can be presented in a graphical or statistical format. A wide range of 

interchangeable probes means simple maintenance and application fl exibility. 

Key features 

• Compact stand alone modules 

• Measurement display 

• Accuracy and Long Term Stability 

• Interchangeable sensor module 

• Wide range of probes 

• Robust IP65 housing with shock protection 

• Battery powered 

• Custom mounting hardware 

• Large memory 

• User-friendly Software 

• Validated software FDA CFR 21 part 11 


� Easy to install and fl exible 

� Easy observation of current values & alarms 

� Reliable data and reduced maintenance 

� Easy calibration & maintenance 

� One logger – many applications 

� Suitable for industrial use. 

� No installation costs and can be easily relocated 

� Professional installation 

� Long term recording up to one year 

� Easy to learn and use 

� High quality assurance 


HygroLog and HygroLog D Data logger for 

HygroClip probes 16 to 17 


� Integrated display 

� Alarm function 

� Validated, easy-to-use software 

HygroClip probes for HygroLog Data logger 18 to 19 

� Wide range of options to suit any application 

� 0…100 %rh, -50…200 °C 

� 100 % interchangeable without adjustment 

Agent D Data logger for humidity and temperature 20 to 23 

� 64000 point memory 

� Multi channel temperature only versions 

� EX rated 

� External start feature 

Accessories for HygroLog and Agent D 24 to 25 

� Installation hardware 

� Impact protection 

� Connecting cables 

� Power supplies

Store rooms and warehouses 

Production areas 

Datalogger Applications 

Museums, libraries & art galleries 

Transportation 

Clean rooms 

Controlled environments & 

cabinets 

D 

A 

T 

A 

L 

O 

G 

G 

E 

R 

S 

15

D 

A 

T 

A 

L 

O 

G 

G 

E 

R 

S 

16 

HygroLog and HygroLog D 

Humidity and Temperature logger for digital HygroClip ® probes. 

The HygroLog data logger uses the HygroClip range of digital probes for long term recording of humidity 

and temperature conditions. By using the digital signal output from the HygroClip probes, measurement 

precision is optimised with no signal loss over extended cable lengths and no external interference can 

infl uence measured values. Calibration data is maintained within the probe, which means there is no need 

to calibrate the whole system, and probes can be interchanged in seconds. In conjunction with the HW3 

software, the HygroLog can be supplied with full validation documentation. 

HygroLog 

Self contained data logger for HygroClip ® digital probes 

Key features: 

• Stores up to 2 x 5000 values for humidity and temperature 


• Logging interval from 15 seconds to 2 hours 


• Operating modes selectable: Start/stop or loop mode 

• Operating range Logger: 0…100 %rh; -30 …70°C 

(Battery-dependent; with alkaline batteries –10…50°C) 

• Measuring range Probes: -50…200°C, probe dependent 

Order code: 

HygroLog (probe must be ordered separately) 

HygroLog D 

Humidity and Temperature data logger with LCD display for 

HygroClip ® digital probes 

Key features: 

• Stores up to 2 x 5000 values for humidity and temperature 


• Logging interval from 15 seconds to 2 hours 


• Operating modes selectable: Start/stop or loop mode 

• Operating range Logger: 0…100 %rh; -10 …50°C 

(Battery-dependent; with alkaline batteries –10…50°C) 

• Operating range -50…200°C (probe dependent) 

• Visual alarm indicators on LCD for temperature & humidity 

• Battery status display 

• Status display saving / busy 

Order code: 

HygroLog-D (probe must be ordered separately) 

Software HW3 and Data Cable (FDA CFR 21 Part 11) 

The validated multilingual software HW3 is used for programming the 

loggers as well as to retrieve data. Data may be displayed in a table or 

graph form. A language editor gives the user the possibility to translate 

the text into his own language. Psychrometric calculations such as 

dewpoint may also be performed within the software, and the option 

to show these values on the graphic is also included. Calculations may 

be executed by using a pressure constant or, depending on the instruments 

connected, dynamically with a pressure probe. As the software 

can also be used with the full ROTRONIC product range, it offers a variety 

of other features, such as sending e-mails in case of alarms, data 

archiving, etc. Of course, measurement data can also be exported to 

MS Offi ce applications. 

For extended description see section HW3 software. 

Order code: 

HygroData HL


Highly precise and stable humi - 

dity and temperature sensors 

HygroLog 

Interchangeable probes 

Calibration can be updated, 

or the range of application 

changed by the simple 

connection of a different 

probe. See next page for 

available options. 10000 point 

integrated memory 

Connection socket for probe 

or PC interface cable 

Wall mounting bracket with option 

to connect mains power adapter 

Robust IP65 enclosure 

Integrated LC display 

Includes battery status 

and alarm indicators 

Programmable 

measurement interval 

15 seconds to 2 hours 

User replaceable batteries 

D 

A 

T 

A 

L 

O 

G 

G 

E 

R 

S 

17

D 

A 

T 

A 

L 

O 

G 

G 

E 

R 

S 

18 

HygroClip probes for HygroLog Datalogger 

A range of probes for different applications are available for the HygroLog Dataloggers. All probes 

are based on the digital HygroClip technology, and can be interchanged within seconds without need 

for recalibration. With special adaptor cables, even probes designed for transmitters may be used. 

HygroClip S/S1 

Standard sensor module for humidity and temperature. A wire mesh 

fi lter provides sensor protection against dust and high air velocity. 

Dimensions Ø15 x 100 mm. IP rating: IP65 

HygroClip S1 is a specially calibrated and certifi ed to provide 

measurement accuracy of ±1%rh. 

Measurement range: -40…85°C, 0…100%rh 

Accuracy (S1): ±1.0 %rh, ±0.2 K (at 23°C) 


Order code: 

HygroClip S1 

HygroClip S 

Ø: 15 mm Length: 100 mm 


4/5 mm cable probe for humidity and temperature measurements in 

small spaces such as product & packaging testing, concrete, electronic 

test and climatic chambers. 

Cable length 2m 



Order code: 



Ø: 4/5 mm Cable: 2 m 

HygroClip HK 25 /HK40 

High temperature probe for measurements in ducts, dryers, climatic 

chambers etc. Probe length 250 or 400 mm. Wire mesh fi lter included. 

Measurement range: HK25: -50…150°C, 0…100%rh 

HK40: -50…200°C, 0…100%rh 


Order code: 

HygroClip HK25 (250 mm, max.150°C) 

HygroClip HK40 (400 mm, max. 200°C) 

Ø: 15 mm Probe length: 250 mm/400 mm Cable: 2 m


HygroClip Probes for HygroLog Datalogger 

Fast response 5 mm diameter insertion probe with laser cut air slots 

for bulk goods such as corn, wheat, & granules. Also suitable for 

measurements in concrete and brick. Not suitable for powders. 

Probe length 200 mm 

Measurement range: -40…85°C , 0…100 %rh, 


Order code: 




Robust 10mm diameter tubular probe for measurements in bulk 

products such as powders & granules. Probe length 280 mm, 

2m cable, steel sinter fi lter. 


Accuracy: ±1.5%rh, ±0.3 K (at 23°C) 

Order code: 



HygroClip HS28 Sword Probe 

For measurements in paper stacks/rolls. Lightweight, yet robust aluminium 

blade for fast temperature and humidity equilibrium. 

Blade 280 x 18 x 4 mm. 

Measuring range: -40…85°C, 0… 100 %rh 


Order code: 

HygroClip HS28 

Sword length: 280 mm Cable: 2 m 

D 

A 

T 

A 

L 

O 

G 

G 

E 

R 

S 

19

D 

A 

T 

A 

L 

O 

G 

G 

E 

R 

S 

20 

Agent-D Series 

Agent-D Series Humidity and temperature logger 

The Agent-D series is a versatile family of data-loggers with integrated LC display for the 

measurement of humidity and temperature with both integrated and cable mounted sensors. 

Measurement ranges and logging interval can be confi gured with easy-to-use Windows software, 

or via the integrated keypad. A special version is available for hazardous areas (Zone 1). All versions 

feature a 64000 point memory, user replaceable batteries and the operating range of the 

logger is -35…55°C / 0…100 %rh. Measurement range depends on the probe confi guration. (see 

Probes for Agent-D-NT & PT Series) 

Agent-D-HT2 

2-channel humidity and temperature logger 

• Integrated probe for temperature / humidity Agent-D-Clip-S 

• Optional remote probe for humidity and temperature 

• Measuring range with: 

– integrated probe: -35…55°C / 0…100 %rh 

– remote probe: -35…70°C / 0…100 %rh 

– high temp. remote probe: -35…110°C / 0…100%rh 

• Single digital input for monitoring doors etc (switch status) 

Order code: 

Agent-D-HT2 included probe Agent-D-Clip-S 

Agent-D-HT2-EX (for EX-Zone 1) included probe Agent-D-Clip-S 

Agent-D-NT3 

3-channel temperature logger with NTC probes 

• 1 integrated NTC temperature sensor 

• 2 external NTC probes connected by D-sub-15 plug 

• Measuring range: -50…140°C 

Order code: 

Agent-D-NT3 

Agent-D-NT3-EX (for EX-Zone 1) 

Agent-D-PT4 

4 channel temperature logger for Pt100 probes 

• Integrated keypad 

• Pt100 probe 4 wire connection, Lemo or D-sub connector 


• Single digital input for monitoring doors etc (switch status) 

Order code: 

Agent-D-PT4 

Probe must be ordered separately, see page 22.


Digital display for measured 

value, date, time and alarm 

(displayable down to –20°C) 

Alarm-reset, 

measuring values and 

alarm scroll via keypad 

Results may be 

printed directly 

without a PC 

External start 

(devices without keypad only), 


Display test 

Memory for 64,000 

measurement values 

Choice of sensors: 

Humidity/temperature 

combined 

or Temperature 

only see page 22 and 23 

Replaceable, commercially available 

batteries 

D 

A 

T 

A 

L 

O 

G 

G 

E 

R 

S 

21

D 

A 

T 

A 

L 

O 

G 

G 

E 

R 

S 

22 

Probes for Agent-D-NT & PT Series 

Agent-D-HT2 Probes 

Combined standard probe for temperature & humidity 

Measuring range: –35…70°C / 0…100 %rh 

High temperature probe: –35…110°C 

Refurbished (standard) probe 

Order code: 

Agent-D-Clip S Standard probe 

Agent-D-Clip H High temperature probe Agent-D-Clip H 

(with Agent-D-D12 only) 

Agent-D-Clip R Refurbished standard probe 

Temperature probe Specifi cation Probe Order code 

1 probe 1 probe 2 probe 

Lemo Plug D-sub Plug D-sub Plug 

Universal probe -50...140°C 

Cable length: 2 m NTC AC3010-NL AC3010-ND1 AC3010-ND2 

T max. Cable: 140°C 

-80...260°C 

Cable length: 4 m Pt100 AC3163-PL 


Miniature bead probe -50...140°C 

Cable length: 2 m NTC AC3055-NL AC3055-ND1 AC3055-ND2 


Surface probe 

Plug-in probe 

Robust universal probe 

Flexible universal probe 

High temperature probe 

Agent-D Probes 

-50...140°C 

Cable length: 2 m NTC AC3041-NL AC3041-ND1 


-35...55°C NTC AC3060-NL 

Pt100 AC3160-PL 

-50...140°C 

Cable length: 10 m NTC AC3090-NL 


-200...350°C 

Cable length: 5 m Pt100 AC3165-PL 


-80...500°C 

Cable length: 4 m Pt100 AC3162 - PL 

T max. Cable: 250°C


Agent-D-HT2 

8 1 5 

1 

9 

Agent-D-PT4 

8 1 5 

1 

9 

Agent-D-NT4 

8 1 5 

1 

9 

Agent-D-NT3 

8 1 5 

1 

9 

8 GND 15 RxD 

7 TxD 14 Busy 

6 + Ref. 13 NTC1 

5 A1 12 NTC2 

4 A2 11 D1, 2 

3 B1 10 DigitIn 

2 B2 9 Alarm 

1 C1, 2 

8 GND 15 RxD 

7 TxD 14 Busy 

6 Ubat 13 A2 

5 A1 12 A2 

4 A1 11 B 2 

3 B1 10 DigitIn 

2 B1 9 Alarm 

1 B2 

8 GND 15 RxD 

7 TxD 14 Busy 

6 NTC2 13 Res. 

5 +Ref 12 DigitIn1 

4 NTC4 11 Ubat 

3 NTC3 10 DigitIn2 

2 +Ref 9 Alarm 

1 NTC1 

8 GND 15 RxD 

7 TxD 14 Busy 

6 NTC2 13 Res. 

5 +Ref 12 Start/ 

Inpos 

4 Res 11 Ubat 

3 NTC3 10 Alarm 

Reset 

2 +Ref 9 Alarm 

1 NTC1 

NTC 

+Ref 

A 

B 

C 

D 

GND 

+Ref 

DigitIn 

Alarm + 

GND 

PTA 

PTA 

PTB 

PTB 

Ubat 

DigitIn 

Alarm + 

GND 

NTC 

+Ref 

UBat 

DigitIn 

Alarm + 

GND 

NTC 

+Ref 

UBat 

Start/Inpos 

Ubat 

Alarm Reset 

0…50VDC, max. 200mA 



Schematics 

Electrical connections Electrical diagrams Dimensional diagrams 

A B 

A 

B 

8 4 

3 4 

LEMO connector 

(View from the 

solder side) 

8 4 

3 4 

8 4 

3 4 

8 4 

3 4 

1 1 1 . 5 

Keyboard 

F 1 F 2 F 3 

5 8 

Replaceable humidity and 

temperature sensor module 

1 1 1 . 5 3 4 

F 1 F 2 F 3 

5 8 

1 1 1 . 5 3 4 

F 1 F 2 F 3 

5 8 

NTC sensor integrated in logger housing 

1 1 1 . 5 3 4 

5 8 

D 

A 

T 

A 

L 

O 

G 

G 

E 

R 

S 

23

D 

A 

T 

A 

L 

O 

G 

G 

E 

R 

S 

24 

Accessories 

For HygroLog 

Wall Mounting Bracket and Anti Theft Device 

Wall mounting bracket with integrated power supply connector, suitable 

for AC1207 adaptor. May be combined with Anti Theft Device 

AC1005. 

The HygroLog-IPH is fi xed on a fl at surface together with the securing 

plate by two screws. A steel rod with a padlock secures the logger in 

place. (Delivered without padlock) 

Order code: 

HygroLog-IPH Wall mounting bracket 

AC1207 AC Adaptor 

AC1005 Anti Theft Device 

Extension Cables and Adaptors 

For applications in high temperatures or in ducts, etc. where the logger 

housing may not be located in directly. Available in 2 lengths: 

Order code: 

MOK-01-DAT05 1m 

MOK-02-DAT05 2m 

12.02.1086 USB Adapter 

T7-03-DAT05 Adaptor for industrial probes 

Impact Protection HygroLog-SP 

The impact protection HygroLog-SP may be a welcome accessory 

in cases where the logger is exposed to shocks, vibrations and harsh 

environmental conditions. It protects the logger, thus saving you 

money in the long run. 

Order code: 

HygroLog-SP 

For Agent-Series 

Protocol Printer 

Thermo printer with serial interface for print-outs of the logged data 

Order Code: 

Agent-D-Print Printer 

Agent-D-DataP Data cable printer 

Agent-D-Data Data cable PC/Logger 

Probe Cables 

Extension cable for 1 or 2 Agent-D-Clip probes Agent D-HT2, 

for D-Sub connector. Lengths: 2 and 5 m 

Order code: 

Agent-D-D12 2 m / 1 Probe 

Agent-D-D22 2 m / 2 Probes 

Agent-D-D15 5 m / 1 Probe 

Agent-D-D25 5 m / 2 Probes 

Various 

Order code: 

Agent-D-SW Application Software multilingual 

Agent-D-SW-UP Software Update 

Agent-D-IPH Mounting bracket 

Agent-D-IPH-L Mounting bracket lockable 

Agent-D-AL Connector plug with screw terminals 

Agent-D-Bat Lithium battery for Agent-D

Series HygroLog HygroLog D Agent-D-HT2 Agent-D-NT3 Agent-D-PT4 

Humidity sensor HygroClip-S probe C 94 N/A N/A 

Temperature sensor with HYGROMER ® AC-1 NTC NTC Pt100 

Pt100 1/3 DIN 

Operating ranges 

Humidity 0…100 %rh 0...100 %rh 

Temperature - 35...55 °C 

- with alkaline battery -10...50°C 

- with special batteries -30...70°C -10...50°C 

Measuring ranges 

Humidity = Operating range of probe 0...100 %rh N/A 

Temperature = Operating range of probe -50...140°C -200...550°C 

Accuracy at 23°C ±1.5 %rh / ±0.3 K 

Output signal RS232 

Reproducibility < 0.5 %rh /

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

26 

Transmitters 

ROTRONIC humidity and temperature transmitters are world renowned for their excellent precision, longterm 

stability and reliability. Today our transmitter range offers an unparalleled range of innovative features 

to compliment the core ROTRONIC abilities of accuracy, reliability and long term stability. 

Transmitters are measuring instruments for fi xed installation with a specifi c signal output; primarily made 

for process applications and control. In climate control applications, ROTRONIC transmitters are used to 

optimise energy use and create a comfortable environment. Key features are accuracy, long term stability, 

time/cost saving installation, and low cost maintenance; they will easily outperform the low cost products 

typically used in commercial BMS/HVAC systems. 

Typical applications include building management systems, offi ce buildings, storage areas, clean rooms, 

hospitals, computer rooms, telecommunications centres. 

ROTRONIC industrial transmitters are robust – high quality products designed specifi cally for demanding 

commercial and industrial applications. They tolerate exposure to wide temperature variation, condensation 

and high levels of chemical pollution thanks to the unique properties of the Hygromer ® humidity sensor, 

which ensures excellent long-term stability in the most demanding applications. The highest precision 

over a wide operating range is achieved with dynamic temperature compensation (-50…200°C). 

The new generation of HygroClip industrial transmitters is based on the latest digital fl ash technology so 

probes can be interchanged with no effect on system accuracy. The modular probe concept means on-site 

calibration and maintenance is virtually eliminated. State of the art features also include calculation of a 

wide range of humidity parameters, user programmable scaling of output signals and networkable digital 

communications. 

Typical applications include process monitoring and optimisation, test cells, drying processes up to 200°C, 

climatic chambers, and high value product environments such as the pharmaceutical and semiconductor 

industries. 

Key features 

• Excellent long term stability

Power Stations 

Power generation, whether nuclear 

or fossil fuelled requires 

carefully controlled environments 

for best performance and 

reliability. 

Drying processes. 

Monitoring and control of any industrial 

drying process can have 

signifi cant benefi ts in terms of 

product quality, energy use and 

productivity. 

Environmental Test. 

Every product from mobile 

telephones to a car is today 

subjected to thorough climatic 

test conditions to establish and 

maintain reliability. Humidity 

and temperature conditions are a 

critical part of this process. 

Transmitter Applications 

High temperature. 

HygroFlex offers the highest direct 

humidity measurement currently 

available. 

Ceramics Industry. 

The measurement and control of 

the drying processes in the ceramics 

industry. 

Intrinsically safe. 

In combination with the 

HygroClip EX, the HygroFlex can 

be used to measure humidity 

and temperature in the most 

hazardous zone 0. 

Hazardous storage areas 

Explosive materials such 

as weapons or chemicals 

also need to be kept at the correct 

humidity and temperature 

conditions. 

Paper Industry 

Monitoring and control of the 

drying process. 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

27

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

28 

The Digital Advantage 

1. Measurement Accuracy: 

Digital processing of sensor signals provides much more scope and fl exibility for the compensation of error 

components such as linearity and temperature coeffi cients. ROTRONIC sensors have always been regarded 

as amongst the most precise and stable in the world; with this new technology, small errors become even 

smaller! 

2. Maintenance and Calibration: 

Digital signal communication allows components to be ‘hot swapped’ without loss of measurement precision 

– calibration and sensor data are retained permanently within each digital HygroClip probe. 

HygroClip probes can be ‘hot swapped’ in seconds, signifi cantly reducing the maintenance and downtime 

costs associated with the removal of instruments to laboratories or workshops for diffi cult, time-consuming 

calibration and repair. HygroFlex can also be fi eld calibrated and adjusted directly using the HygroPalm 3 

calibrator. 

3. Precision and Stability: 

Digital circuits are inherently more stable than analogue, and are less affected by temperature changes. 

Calibration adjustment is made purely by software, meaning no unstable, hard-to-reach potentiometers. 

The option for multiple calibration points is extended across the full measurement range. 

4. Application Flexibility: 

HygroFlex 

HygroFlex is a new generation of industrial humidity and temperature transmitters based on the very latest 

digital technology. Digital signal processing signifi cantly benefi ts humidity and temperature measurement 

in fi ve key areas: 

Measurement change? Need dew-point instead of %rh? Or the mixing ratio ? Simply connect the HygroFlex 

to a PC and change the confi guration! 

Different installation? If your application needs change, simply fi t one of the wide range of probes with an 

alternative confi guration or temperature operating range. 

Multiple point measurement? Need to expand? The HW3 software package offers a comprehensive networking 

solution for up to 32 instruments. HW3 features data logging (reporting), graphical and alarm functions 

and operates on any standard Windows based PC. 

Wiring hardly possible? Or too expensive? The HygroFlex is able to communicate by means of a radio controlled 

interface option. 

5. Measurement of Dew Point and other Parameters: 

Digital technology makes it possible to obtain parameters such as dew point or the mixing ratio with economical, 

versatile and easy-to-maintain instruments and probes. Taking the chilled mirror technology as an 

example, typical requirements and problems are eliminated: no sampling system is required in most applications, 

there is no longer any uncertainty between dew and frost, and the requirement for frequent mirror 

cleaning fully disappears.

Core features 

High quality electronics 

High quality, high stability electronics 

ensure consistent long 

term performance 

High temperature capability 

ROTRONIC transmitters 

have the widest direct 

humidity measurement 

range in the world working 

from –50…200°C. 

High quality sensor 

The Hygromer ® IN-1 humidity 

sensor is arguably the best in 

the world. Precise factory adjustment 

and superb long term stability 

provide consistent measurement 

results with minimum 

maintenance. 

HygroFlex 

Temperature compensated 

All ROTRONIC transmitters are 

dynamically temperature compensated 

to maintain best possible 

humidity measurement accuracy 

over very wide temperature 

ranges. 

Interchangeable probes. 

Across the entire ROTRONIC 

transmitter range it is possible 

to specify interchangeable 

probes; simplifying fi eld 

maintenance and maximising 

application fl exibility. 

User calibration 

All ROTRONIC transmitters can 

be adjusted by the user to provide 

optimum precision throughout 

the product’s life without 

expensive ‘return to base’ maintenance. 

Digital technology 

Digital signal processing not 

only provides the best possible 

precision, but also allows fully 

digital adjustment for all industrial 

HygroClip probes. 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

29

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

30 

Key features: 

• %rh and temperature 

• Interchangeable probes 

• Two linear analogue outputs 

• Jumper confi guration of 

analogue outputs 

• One probe input, digital or 

analogue (0…2.5 V, 10 Bit A/D; 

12 Bit interpolated) 

• Optional display/keypad 

HygroFlex 1 

Analogue outputs 

HygroFlex 1 accepts one HygroClip probe and provides two linear 

analogue outputs for relative humidity and temperature. Standard 

factory confi guration is 4…20 mA, but this can be easily changed to 

0…20 mA, 0…1 V, 0…5 V or 10 V. Scaling of the output range can be 

modifi ed from the standard 0…100%rh and 0…100°C using the internal 

service connection, connecting cable AC1623 and a PC running 

the HW3 software. 

An external test socket is standard. A HygroPalm 3 handheld instrument 

can be connected to provide a live display of the transmitters 

current measurement values. When connected, the HygroPalm 3 can 

also be used as a digital adjustment tool for any probe connected to 

the HygroFlex 1. 

The optional display & keypad gives a local display of measurement 

values and provides access to the 1 or 4 point probe adjustment directly 

from the HygroFlex 1 transmitter. 

For probe options, see page 34 to 35. 

HygroFlex 1 Ordering Information for Standard Versions 

H T S 1 1 X HygroFlex 1; 4…20 mA=0…100 %rh; 0…100°C; 12…35 VDC/24 VAC power 

H T S 1 2 X HygroFlex 1; 4…20 mA=0…100 %rh; 0…100°C; 90...250 VAC power 

H T S 1 1 D HygroFlex 1; 4…20 mA=0…100 %rh; 0…100°C; 12…35 VDC/24 VAC power; 

Display & Keypad 

H T S 1 2 D HygroFlex 1; 4…20 mA=0…100 %rh; 0…100°C; 90...250 VAC power; 


(see page 33 for order codes for special versions) 

HygroFlex 1 Standard Connection Layout 

Probe (Tuchel) Test socket 

(Binder 712, 2-pin) 

2x M16 Cable glands for 

power and signal cables

Digital output, two Probes and Calculation function 

HygroFlex 2 

HygroFlex 2 measures and transmits humidity and temperature measurements only in a digital format. The 

data is either output in an RS232 signal directly to a PC, or up to 32 transmitters can be networked together 

using RS485 for network communication, with RS232 used for PC connection. HygroFlex 2 is also supplied 

as standard with the capability to accept a second probe input and has integrated psychrometric calculation 

for parameters such as dew-point or mixing ratio. Thanks to the possibility to accept 2 probes, it is possible 

to set up a network with up to 64 probes = 128 measuring values at a very reasonable price. Probe- cables of 

up to 200m cover all applications. Standard features also include full user programmability and an external 

test socket. 

An external test socket is standard. A HygroPalm handheld instrument 

can be connected to provide a live display of the transmitters current 

measurement values. When connected, the HygroPalm can also 

be used as a digital adjustment tool for any probe connected to the 

HygroFlex. 

The optional display & keypad gives a local display of measurement 

values and provides access to the 1 or 4 point probe adjustment 

directly from the HygroFlex 2 transmitter. 


Key features: 

H T S 2 1 X HygroFlex 2; digital output only; 12…35 VDC/24 VAC power; 2 probe inputs 

H T S 2 2 X HygroFlex 2; digital output only; 90...250 VAC power; 2 probe inputs 

H T S 2 1 D HygroFlex 2; digital output only; 12…35 VDC/24 VAC power; 2 probe inputs; 


H T S 2 2 D HygroFlex 2; digital output only; 90...250 VAC power; 2 probe inputs; 




Test socket 

(Binder 712, 2-pin) 

Probe 1 (Tuchel) 

Probe 2 (Tuchel) 

• %rh and temperature 

• Display of calculated values; 

dew-point, mixing ratio, etc 

(with keypad/display option) 

• RS232 output (%rh and temperature) 

• Networkable (RS485) 

• 2 nd probe input (digital or analogue 

0…2.5V e.g. pressure) 

• Fully user programmable 

Serial connection RS232/485 

(Binder 763/ 5-pin) 

Power connection 

(M16 cable gland) 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

31

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

32 

HygroFlex 3 

Simultaneous Analogue and Digital Outputs with Absolute Humidity Calculation 

HygroFlex 3 combines all the features of the HygroFlex 1 and 2 into a highly specifi ed instrument, and 

represents probably the most advanced humidity and temperature transmitter on the market. Additional 

features include a third analogue output for greater fl exibility, a simultaneous serial output and the ability 

to dynamically compensate calculated humidity parameters for variations in application pressure. 

The comprehensive range of outputs available makes the HygroFlex 3 particularly well suited to combined 

monitoring and control applications. The analogue outputs can be connected to the applications control 

system, whilst the digital RS232 signal interfaces with a local PC where engineers can monitor the process 

and set up alarms via Email or SMS text messages. 

The dynamic pressure compensation feature is truly state of the art. In climatic test or research and development 

projects, the humidity measurements can be optimised for any condition with the inclusion of 

pressure measurement, and therefore compensation of pressure dependent calculated values such as enthalpy 

and wet-bulb temperature. All calculated parameters are based on WMO formulae. 

Key features: 

• %rh, temperature and calculated 

value (dew-point, mixing 

ratio, etc) 

• Three linear analogue outputs 

(all measured and calculated 

parameters) 

• Jumper confi guration of analogue 

outputs 

• Simultaneous digital output 

(%rh and temperature) 

• Networkable (RS485) 

• 2 nd probe input (digital or analogue 

0…2.5V e.g. pressure) 

• Fully user programmable 

• External test socket 

• Optional display and keypad 

RS485 

RS485 

RS232 

An external test socket allows the connection of a HygroPalm 3 handheld, 

which will display the actual values of the transmitter. With the 

HygroPalm 3 it is also possible to adjust the digital ROTRONIC probes 

connected to transmitter. 


H T S 3 1 X HygroFlex 3; 4…20mA = 0…100 %rh; 0…100 °C/°C dew-point; 12…35 VDC/24 VAC power; 

2 probe inputs 

H T S 3 2 X HygroFlex 3; 4…20mA = 0…100 %rh; 0…100 °C/°C dew-point; 90...250 VAC power; 

2 probe inputs 

H T S 3 1 D HygroFlex 3; 4…20mA = 0…100 %rh; 0…100 °C/°C dew-point; 12…35 VDC/24 VAC power; 

2 probe inputs (1 optional); Display & Keypad 

H T S 3 2 D HygroFlex 3; 4…20mA = 0…100 %rh; 0…100 °C/°C dew-point; 90...250 VAC power; 

2 probe inputs (1 optional); Display & Keypad 



Probe 1 Tuchel Power connection 

& analog output 

Test socket 

(Binder 712, 2 pin) 

Probe 2 (Option) 

Binder 712, 5 pin 

Serial connection RS232/485 

(Binder 763/ 5-pol) 

(M16 cable gland)

Display and Keypad 

By specifying the HygroFlex display and keypad option you gain useful 

functions: Local display of humidity, temperature and calculated 

humidity parameters such as dew-point, mixing ratio, wet-bulb. 

Through the keypad one can access the menu functions of the 

HygroFlex where the user can confi gure display settings, access the 

probe calibration functions, obtain a system status, select which 

probe to view and display serial numbers. The keypad can be locked 

to protect critical system and calibration settings. 

Order code: 

Digidisp-HTS 

(For retrofi tting non display versions) 

see also HygroFlex order code table 

Metal Housing 

Order code table for HygroFlex 

Here you can specify the full range of options and confi gurations for 

the various HygroFlex models. 

HygroFlex Options 

In the worst industrial environments the additional protection of a 

metal instrument housing helps to extend the product life. The 

HygroFlex optional metal housing is extremely robust and is available 

for all versions, with and without the display/keypad option. 

Ordering information: see HygroFlex order code table 

Radio option: (433.92 MHz) 

Wherever cabling is too complicated or too expensive, the radio option 

of the HygroFlex is a good choice. Distances up to 400 m in 

the fi eld or ~50 m inside buildings are bridged. 

HygroFlex transmitters may even be retrofi tted in the factory. 

Note: In some countries, radio operation is not allowed or requires 

a license. 

Order code: see table below. 

Other options 

HW3 software 

The HW3 software package has a comprehensive range of functions 

which are compatible with the HygroFlex, see chapter HW3 Software 

for full information. 

USB Adapter 

The USB Adaptor is used to connect the serial data cable to a USB 

port of a PC 

Order Code: 

12.02.1086 

H T S 1 1 X HygroFlex 1; 4…20 mA=0…100 %rh; 0…100°C; 12…35 VDC/24 VAC power 

H T S 2 1 X HygroFlex 2; digital outputs only; 12…35 VDC/24 VAC power; 2 probe inputs 

H T S 3 1 X HygroFlex 3; 4…20 mA=0…100 %rh; 0…100°C/°C dew-point; 12…35 VDC/24 VAC 

power; 2 probe inputs (1 optional); 

M Metal Housing 

1 12…35 VDC /24 VAC power 

2 90…250 VAC power 

X No display and keypad 

D Optional display and keypad 

/ 9 Customized version; Parameters to be specifi ed within the given limits 

(see technical data) 

R C Radio option 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

33

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

34 

HygroFlex Probes 

Fully interchangeable range of probes, simply choose the best version to suit your application. If your needs 

change, choose a different probe! 

HygroClip IW / IW1 

For wall mounting applications (area monitoring), lightweight construction 

for fast thermal response. 

Measurement range: 0…100 %rh, -40…85°C 

Accuracy: ±1 %rh/±0.2 K for IW1; ±1.5 %rh/±0.3 K for IW 

Probe: Delrin 25/15 mmØ 

Sensor protection: Wire mesh fi lter 

Order code: 

HygroClip IW1 (±1 %rh/0.2 K) with SCS certifi cate 

HygroClip IW 

Probe length: 145 mm Diameter: 15 mm 

HygroClip IC 

Cable mounted probe for fl exible installation in varied applications 

such as high temperatures, climatic chambers, ducts etc. Two versions 

are available, 100 & 250 mm probe length. Select appropriate cable 

length. 


Probe: PPS 15 mmØ 

Cable: 2 m / 5 m / 10 m available on request, see below 

Order code: 

HygroClip IC1 100 mm probe 

HygroClip IC3 250 mm probe 

HygroClip IC-1/X X = 2 =^ 2 m cable 

X = 5 =^ 5 m cable 

X = 10 =^ 10 m cable 

Probe length: 100/250 mm Diameter: 15 mm Cable: 2 m 

HygroClip IM 

Robust stainless steel probe for duct, or through-wall installation. 

Suitable for use in the food industry. Select appropriate cable length. 

max. 200°C. 

Two versions are available, 120 & 270 mm probe length. 


Probe: Stainless steel, 15 mmØ 

Cable: 2 m / 5 m / 10 m available on request 

Order code: 

HygroClip IM1 120 mm probe 

HygroClip IM3 270 mm probe 

HygroClip IM-1/X X=2 =^ 2m cable 

X=5 =^ 5 m cable 

X=10 =^ 10 m cable 

Probe length: 120/270 mm Diameter: 15 mm Cable: 2 m

HygroClip IE 

HygroFlex Probes 

For pressurised applications up to a maximum of 50 bar and temperatures 

of 100°C. Two versions are available with different threads 1⁄2" G 

or 1⁄2" NPT. 


Probe: Stainless steel 

Cable: 2 m 

Order code: 

HygroClip IE-1 1⁄2" G pressure probe 

HygroClip IE-3 1⁄2" NPT pressure probe 

Screw-in probe Cable: 2 m 

HygroClip IC-04 / 05 

4/5 mm diameter probe for measurement in tight spaces such as 

climatic test applications, or monitoring conditions of materials. 

Max. 100°C 

Measurement range: 0...100 %rh, -40...100°C 

Probe: Nickel-plated brass 

Order code: 

HygroClip IC-04 4 mmØ probe with 2m cable 

HygroClip IC-05 5 mmØ probe with 2m cable 

Diameter: 5 mm Cable: 2 m 

HygroClip ICx with 15/25 mm probe 

HygroClip industrial probe with shaft diameter 15/25 mm to replace 

the old A-type duct probes of I-1000 and I-2000 series. 

No installation changes need to be made. 

Specifi cations are the same as for the standard HygroClip IC probes. 

The order codes are the same as for the standard probes, but with the 

extension HygroClip IC-x/15/25. The robust mechanical construction 

allows probe lengths up to 700 mm. 

Example: HygroClip IC-3/15/25 (Probe length = 250mm) 

Diameter: 15 mm Diameter: 25 mm Cable: 2 m 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

35

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

36 

SP-MSB15 

Metal slotted cap 

mounted over sensor 

Accessories 

Order code, fi lter, fi lter type, properties 

Function: Protects sensors against pollution and 

high air velocity (up to 40m/s). 

A fi lter is required for air velocity above 3m/s. 

HygroClip Industrial Probe Extension Cable 

Should you wish to extend the distance between the HygroFlex transmitter 

and probe, the extension cable AC1616 can be specifi ed with 

lengths up to 200m thanks to an integral signal booster. 

Order code: 

AC1616xxx Where required length xxx = 010 to 200 m, in steps 

of 10 m 

AC1619 Pair of connectors with electronics for customers 

own cable assembly. 

Probe options/fi lters/mounting hardware 

The robust slotted cap also functions as a fi lter holder and provides 

mechanical protection when the fi lter element is removed. 

Steel sinter fi lter SP-S15 

Wire mesh fi lter SP-M15 

Tefl on fi lter SP-T15 

Order code Type of fi lter Properties Max. air velocity 

SP-S15 Steel sinter fi lter element High level of fi ltration 

pore size ca. 5µ Marginal effect on response times. 

Not suitable for high humidity applications 40m/s 

SP-M15 Wire mesh fi lter element Minimal measuring delay 

Mesh size ca. 20-25µ Reduced fi ltration effi ciency for small particles. 

Suitable for high humidity applications 20m/s 

SP-T15 Tefl on fi lter element Good fi ltration effect 

pore size ca. 10µ Extends response time in low air velocity 

Water repellent but water vapour permeable 20m/s

ATEX 2180 

ATEX 2180 

ATEX 2180 

HygroClip EX 

HygroClip EX Digital EX Humidity and Temperature Measurement 

HygroClip EX is a series of probes for the measurement of humidity and temperature in hazardous areas 

featuring the latest digital signal processing and data transmission technology. Suitable for connection to 

the HygroFlex range of industrial transmitters, or for use as a stand alone 4…20 mA 2 wire transmitter, the 

HygroClip EX probes offer wide measurement ranges and fl exible installation options. 

The EX probes are based on ROTRONIC’s innovative HygroClip technology, which features a custom ASIC 

to provide the highest possible accuracy and features such as digital calibration and probe interchange ability. 

Each probe is constructed throughout from high grade stainless steel, with full IP65 protection. Each 

probe is fi tted with a replaceable fi lter system which protects the sensors from high air speeds, dust, grease 

etc. 

To comply with hazardous area standards, a Zener Barrier is required between the HygroClip EX probes and 

the HygroFlex, or when used as a 2 wire 4…20mA transmitter, between the probe and the control or monitoring 

system. 

All three probes measure over the range of 0…100 %rh thanks to the well proven Hygromer humidity sensor 

technology which has excellent long term stability, high tolerance to chemical contamination, and withstands 

exposure to condensation without any effect on calibration stability. Temperature range is dependent 

on the version used. 

HygroClip ID-EX 

Suitable for duct or through-the-wall installation with a robust 

250 x 15mm stainless steel probe. Temperature measuring range is 

0…100°C, provided the electronics enclosure does not exceed the Ex 

temperature rating (-20…40°C). 

Order code: 

HygroClip ID-EX 

HygroClip IC-EX 

Cable mounted probe for use in applications with high or low temperatures 

(-50…200°C) and where installation fl exibility is required. 

The robust stainless steel probe is available in two lengths, 120 and 

270 mm, and both are fi tted with a 2 m cable. 

Order code: 

HygroClip IC1-EX (120 mm) 

HygroClip IC2-EX (270 mm) 

HygroClip IW-EX 

For wall mounted applications with an external stainless probe 

(150 x 15 mm). Operating temperature: -20…40°C 

Order code: 

HygroClip IW-EX 

Note: 

The total cable length between the HygroClip EX probe and the 

HygroFlex transmitter must not exceed 200 m. 

: 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

37

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

38 

Digital EX Humidity Temp. Application 

Digital EX Humidity and Temperature Application 

Duct-mount probe Wall-mount probe Cable type

HygroClip EX Technical Specifi cations 

Specifi cations and Ordering Information 

Specifi cations HygroClip ID-EX HygroClip IW-EX HygroClip IC-EX 

Humidity measuring range 0…100 %rh 

Temperature measuring range -30…100°C* -20…40°C -50…200 °C 

Accuracy at 23°C ±1 %rh, ±0.2 K 

Repeatability < 0.5 %rh, 0.1°C 

Response Time

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

40 

+ 

_ 1 2 

B4 

B3 

B2 

B1 

1 

A L M 

HygroFlex 

HygroFlex Maintenance and Calibration 

Probe of the 

intrinsically 

safe transmitter 

Probe of the 

intrinsically 

safe 

transmitter 

HygroPalm Remote Control of the HygroFlex 

Probe calibration 

Calibration device Calibration device 

Cable type 

SPB5-WIN 

Probe of the 

intrinsically 

safe transmitter 

Function HygroPalm 1 HygroPalm 2 HygroPalm 3 

Display the readings from any probe connected to the HygroFlex • • • 

Display the HygroFlex status (confi guration, serial number, etc.) N/A • • 

1-point adjustment of any HygroClip digital probe connected to the 

transmitter, using the probe connected to the HygroPalm as a reference N/A • • 

Access the functions (except for calculate and display) of the transmit- 

ter, primarily the adjust M.PT function for multi point probe calibration N/A N/A • 

Connecting cable required: AC1621 AC1620 AC1620 

HygroFlex Confi guration by direct PC connection 

It is possible to confi gure the HygroFlex by direct connection to the PC 

using the HW3 software and a connecting cable. 

Order Code: 

HygroData HTS for HygroFlex 2 and HygroFlex 3 

HygroData HTS1X for HygroFlex 1 

The HygroPalm handheld instrument 

can be connected to the 

HygroFlex, and depending on 

the version of the HygroPalm 

used, various tools and functions 

are available by remote control 

(see table below). 

This feature is especially useful 

for HygroFlex transmitters which 

are not specifi ed to include the 

display and keypad option.

Mounting plate of the Transmitter Enclosure 

The HygroFlex is comprised of 5 parts: 

1 mounting bracket 

2 electronics housing 

3 main circuit board 

4 connector plate 

5 front cover with or without optional display and keypad 

1 

2 

4 

To attach the transmitter to a mounting surface: 

1 Attach the mounting bracket to the mounting surface using 

4 screws as shown below. 

2 Slide the electronics housing down on the wall plate to the mechanical 

stop. 

80 mm 

3 

80 mm 

HygroFlex Installation 

5 

4x Ø3…5 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

41

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

42 

HygroFlex 

Dimensional diagrams & electrical connections 

Dimensions of housing Dimensions of mounting plate 

12 to 35 VDC or 12 to 24 VAC supply voltage and voltage output signals 

TB1 (1) 12…35 VDC (-) or 12…24 VAC Neutral TB2 (1) Relative humidity (+) 

TB1 (2) 12…35 VDC (+) or 12…24 VAC Phase TB2 (2) Temperature (+) 

TB1 (3) Ground TB2 (3) Calculated Parameter (+) 

TB2 (4) Common (-) 

90…264 VAC with optional power module and current output signals 

TB1 (1) Neutral 90…264 VAC TB2 (1) Relative humidity (+) 

TB1 (2) Phase 90…264 VAC TB2 (2) Temperature (+) 

TB1 (3) Ground TB2 (3) Calculated Parameter (+) 

TB2 (4) Common (-)

HygroFlex Technical Data 

Specifi cations HygroFlex 1 HygroFlex 2 HygroFlex 3 

Inputs 

Probe connections 

(combined %rh/°C) 1 2 2 

Signal input digital or analogue: 0…2,5 V, 10 Bit A/D, 15 V DC, max. 10 mA supply 

Third party probe input 

(1 analogue) No Yes Yes 

Outputs 

Analogue outputs 2 No 3 

Type of output analogue 0…1 V, 0…5 V, 0…10 V, No 0…1 V, 0…5 V, 0…10 V, 

(jumper selectable) 0…20 mA or 4…20 mA 0…20 mA or 4…20 mA 

RS232 output 

No Yes Yes 

Networkable, RS485 (up to 32 units) No Yes Yes 

Adjustment of probes 

1 point %rh, °C/°F Yes, with display/keypad option 

4 points %rh, 2 points °C/°F Yes, with display/keypad option 

4 points %rh, 2 points °C/°F, 

via PC No Yes Yes 

Test connector for communication 

with HygroPalm handheld Yes Yes Yes 

Calculation & Unit Display 

Calculated humidity values; No full range of calculated values including Dew-point, 

display and output wet-bulb, enthalpy, mixing ratio, water vapour pressure, 

sturation vapour pressure. User defi ned scale. 

Pressure compensation 

for calculated values No Manual or automatic with optional pressure probe 

Technical Data (included probes) 

Measuring range Probe dependent, 0…100 %rh, -50…200°C, 0…2000 hPa 

Accuracy at 23°C ±1,5 %rh, ±0,3 K 

Reproducibility Better than 0.5 %rh/ 0.1°C 

Sensors Hygromer IN-1 (rel. humidity), Pt100 1/3 DIN (Temperature) 

Electronic operating range 0…100%rh (not condensed), -40…60°C, with display -30…60°C 

Display/Keypad (Option) Liquid Crystal 3 line numeric 

Display resolution (Option) 0.1 %rF, 0.1°C, 0.01 calculated value 

Housing, dimensions IP65, ABS, 207 x 150 x 58,3 mm, Metal housing optional 

Weight 310 g 

Supply voltage Standard 12…35 V DC (140 mA), 12…24 V AC 

Optional 90…250 V AC, 3,5 VA 

Electrical connections M16 cable gland (7 mm cable) 

Connection terminals18 AWG 

Analogue output Current ouput (0/4…20 mA), max. load 500 Ω, others are jumper selectable 

(Factory setting 4…20 mA) Voltage (0…1, 5, 10 V), 

min. load 1000 Ω, 

CE-Conformity Complies to norms: EN50081-2, EN50082-2 

Order code table for HygroFlex 

Here you can specify the full range of options and confi gurations for 

the various HygroFlex models. 

H T S 1 1 X HygroFlex 1; 4…20 mA=0…100 %rh; 0…100 °C; 12…35 VDC/24 VAC power 

H T S 2 1 X HygroFlex 2; digital outputs only; DC/24 VAC power; 2 probe inputs 

H T S 3 1 X HygroFlex 3; 4…20 mA=0…100 %rh; 0…100°C/°C dew-point; 12…35 VDC/24 VAC 

power; 2 probe inputs; 

M Metal Housing 

1 12…35 VDC /24 VAC power 

2 90…250 VAC power 

X No display and keypad 

D No display and keypad 

/ 9 Customized version; Parameters to be specifi ed within the given limits 

(see technical data) 

R C Radio option 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

43

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

44 

HygroClip Alarm 

We have frequent requests for an alarm solution that is independent of other manufacturers control equipment, 

and which offers fl exible options for alarm or control. With the new HygroClip Alarm, we 

can now fulfi l these customer requests. 

HygroClip Alarm is a universal programmable alarm and control system that can either be interfaced with 

the HygroFlex, HygroLab and M-series instruments on an RS485 Bus, or operates independently from 

measurement equipment and PC’s. With four relays, it is possible to control four single alarm conditions or 

a block of up to 128 AND/OR linked alarms. The confi guration of the relays and the related logic array is performed 

with the Rotronic HW3 software to precisely meet the requirements of the user. The relays can be 

directly used for switching of loads up to 2500W. 

HygroClip Alarm may be used when connected to a PC or independently. 

A timer function may, for example, be used to control a ventilation system at nighttime, control opening 

and closing of the windows of a greenhouse, or switch lights depending on time etc.. The possible applications 

are extensive. 

Features 

• 4 alarm relays assigned to independent values 

• 1 alarm computed from up to 128 measured values (OR/AND linked) 

• Dew point calculation from humidity/temperature values 

• 2 digital inputs 

• 4 relay outputs (with status LED’s) 

• Real time clock with battery backup 

• Freely confi gurable internal logic, consisting of: 

- 12 Signal delays 

- 6 Flipfl ops 

- 12 Gates (AND / OR / XOR) 

- 2 Monofl ops 

- 1 Pulse width modulator 

- 2 Alarm times from the real time clock 

- 4 virtual keys (controlled by PC-software) 

- Event protocol generation by HW3Software 

Order code: 

HygroClip Alarm 1 with power supply 12…35 VDC/12…24 AC 

HygroClip Alarm 2 with power supply 90…250 VAC 

HW3 software 

Operation 

1. Query of measured values: 

The measurement data from a HygroFlex, HygroLab or M-series 

transmitter are queried via the RS485 network. If a preset alarm 

condition is detected, the device sets an alarm by switching on one 

or more relays according to the units programming. Any of the 

parameters measured by the instruments mentioned above can be 

monitored (humidity, temperature, pressure, air fl ow etc.) 

2. Independent control unit 

HygroClip Alarm may be used as an independent control unit, and 

as such, switch various devices. For example, switching on a ventilation 

unit for 10 minutes every hour. In this mode, HygroClip 

Alarm is completely independent of any PC or other device. 

3. Remote control 

Using HW3 software, virtual keys can be operated. This may be 

useful to cancel an alarm or switch a relay remotely. 

Note: On request, we offer a programming service for this product.

Operating modes 

For HygroClip Alarm, two operating modes are available: 

Easy and Expert modes. 

Easy Mode 

In the Easy Mode, HygroClip Alarm is confi gured using the HW3 software. 

The user interface allows only the most important functions, 

which makes programming very easy. As a maximum, 4 parameters 

and 2 external signals (switches) can be processed. 

Expert Mode 

HygroClip Alarm 

In the Expert Mode, the functions can be displayed graphically and 

directly programmed by dragging and dropping various logic symbols. 

The logic links allow very complex functions. Programming is performed 

directly within HW3 software and is organised in a user-friendly 

way. 

Data logging 

Data logging is performed by the HW3 software. All alarm events are 

logged together with the measured values. 

Even if the PC is switched off (e.g. due to power failure or at night 

time), HygroClip Alarm logs up to 20 events. These may be evaluated 

afterwards from a PC. 

Technical Data HygroClip Alarm 

Power supply 90…250 VAC or 12…35 VDC / 12…24 VAC 

Power consumption 50 mA (without relays) 

Inputs 2 digital inputs 0…5 V or switches 

Outputs 4 Relays (10 A @ 250 VAC/30 VDC, 12 A @ 125 VAC) 

Clock Real-time clock 

Interface RS485 interface 

Radio interface optional 

Housing material Makrolon 

Dimensions 160 x120 x 75 mm 

Electrical connections 3x M12, 5x M16 Cable glands 

Protection class IP65 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

45

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

46 

M-Series & Roline-L Series 

The measurement of temperature and humidity in HVAC/BMS applications becomes more demanding 

with almost every year. Heating, air conditioning and ventilation get more and more sophisticated. Cooled 

ceilings provide an agreeable atmosphere, where hardly any draught may be felt. The exchange of air in 

buildings is reduced to the minimum in order to save energy. The temperature and humidity values are 

regulated within ever-smaller margins. Obviously, the accuracy of the measuring instruments must be 

better than a few years ago. In such demanding environments, the measuring equipment had to compete 

with the demands. ROTRONIC has developed new instruments that suit the requirements of today and 

certainly also of the future. However, there are still other applications, where the utmost accuracy is not 

asked for. For these, ROTRONIC has developed a new line of economically priced instruments also: The 

Roline-L. 

The new M-Line of ROTRONIC represents the latest development in digital humidity measurement. The 

well known and established FT and FH series are now replaced by the new instruments, which offer much 

greater application fl exibility due to the fact that the output signals are scaleable. Hence, the resolution 

becomes better, because it is possible to scale the output of e.g. 0…10 °C to 4…20 mA. In fact, any range 

may be scaled exactly according to your needs. For applications in which the range of the measured values 

is always in a limited range, this represents a remarkable advantage. Control can be made much more effi 

cient and accurate. ROTRONIC provides a number of standard versions types usually from stock. However, 

customized instruments are available on request from your distributor. 

Key features 


• Optional display with good contrast 

• Accuracy and long term stability 

• Interchangeable sensor module 

• Scaleable output signals 

• All standard signals available 

• Aesthetic housing 

• Psychrometric Calculations 


� Easy to handle and fl exible 

� Easy observation of measured values 

� Reliable data and reduced maintenance 

� Easy calibration & maintenance 

� Better resolution, more precise control 

� One instrument for different control systems 

� Use also in living spaces 

� No need for external calculators 

This section contains Page 

New M-Series 48 to 52 


� Optional Display 

� Scaleable Output Signals 

� Psychrometric Calculations 

� High Accuracy 

� Remote Adjustment with Handheld 

New Roline-L Series 53 to 54 

� Best price-performance ratio 

� Fixed probe 

� 2x2 wire technology 

� Single signal use 

� Remote adjustment with handheld

Storage rooms 

Railway stations 

Computer/Server rooms 

Snow Guns 

M-Series Applications Overview 

Cold stores 

Libraries 

Museums 

Green houses 

Climate control 

in offi ce buildings 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

47

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

48 

ROTRONIC M-Series Transmitters 

General Description 

The new ROTRONIC M-series transmitters are the latest development of combined humidity / temperature 

transmitters, based on HygroClip technology. Output signals of 0…1 V, 0…5 V, 0…10 V, 0…20 mA or 4… 

20 mA are available. The M-Series consists of three models; each offering different features to suit the application 

needs, and with the facilities which can be reprogrammed by the customer or reseller. The main 

differentiation between the three M Series is as follows: 

M1 Humidity and temperature transmitters with fi xed probe, with electronics based on digital technology 

M2 Humidity and temperature transmitter with interchangeable HygroClip probes 

M3 Humidity, calculated humidity (e.g. dew point, enthalpy) and temperature transmitter with 

interchangeable HygroClip probes 

M1 

Key features 

• Fixed probe 

• Wall, space and duct mounting versions 

• Combined relative humidity and temperature measurement 

• Digital technology 

• Wide measuring range 

• Excellent long-term stability 

• High accuracy 

• Remote diagnosis with handheld instrument 

• Temperature range –40…60°C 

• Standard output signals (current / voltage) 

• Wire mesh fi lter provides sensor protection against 

dust and high air velocity. 

• IP rating: IP65; IP52 for space version 

Ordering Information Standard M1 with fi xed probes 

Order code Description Electrical connection Applications 

M12D2HT-1X Duct-mount, 0...50 °C / 0...100 %rh 2 wire 4...20 mA, 10…35 VDC 

M12D2HT-4X Duct-mount, -30...70 °C / 0...100 %rh 

M12W2HT-1X Wall-mount, 0...50 °C / 0...100 %rh 

M12W2HT-4X Wall-mount, -30...70 °C / 0...100 %rh 

M12S2HT-1X Space mount, 0...50 °C / 0...100 %rh 

M12S2HT-4X Space mount, -30...70 °C / 0...100 %rh HVAC Applications 

M12S2HT-2X Space mount, 10...40 °C / 0...100 %rh Cold Rooms 

M13D2HT-1X Duct-mount, 0...50 °C / 0...100 %rh 12...35 VDC/24 VAC / 4...20 mA Storage rooms 

M13D2HT-4X Duct-mount, -30...70 °C / 0...100 %rh 3/4 wires Semicond. Industry 



M13S2HT-1X Space mount, 0...50 °C / 0...100 %rh Any application, where 

M13S2HT-4X Space mount, -30...70 °C / 0...100 %rh probes must not be 

M13D5HT-1X Duct-mount, 0...50 °C / 0...100 %rh 12...35 VDC/24 VAC / 0...10 V removed or exchanged. 

M13W5HT-4X Wall-mount, -30...70 °C / 0...100 %rh 3/4 wires 

M13S5HT-1X Space mount, 0...50 °C / 0...100 %rh 

M13D5HT-4X Duct-mount, -30...70 °C / 0...100 %rh 


M13S5HT-4X Space mount, -30...70 °C / 0...100 %rh 

The probe length of all duct mount transmitters is 207 mm; 52 mm for wall mount types 

For non-standard ordering information, please see table on page 51. 

HW3 software 

The HW3 software package has a comprehensive range of functions which are compatible with the M- 

Series, see chapter HW3 Software for full information.

M2 

Humidity and temperature transmitter 

with interchangeable HygroClip S probes 

Key features 

• Probe interchangeable within seconds 

• Wall and duct mounting types 

• Measures humidity and temperature simultaneously 

• Use of digital technology 

• Wide measuring range 


• High accuracy ±1.5 %rh, 0.3 K 

• Optional display 


• Temperature range –40…60°C/-30…60°C with display 

• Wire mesh fi lter provides sensor protection 

against dust and high air velocity. 

• IP rating: IP65 

HygroClip Probes for M-Series transmitters 

HygroClip S 


A wire mesh fi lter provides sensor protection against dust 

and high air velocity. Dimensions Ø15 x 100 mm. 

IP rating: IP65 


Accuracy: ±1.5 %rh, ±0.3 K (at 23 °C) 

Order code: 

HygroClip S 

Extension cable with 

1 / 2 / 5 m cable length 

for HygroClip S probes and M-Series transmitters 

Order code: 

MOK-01-DAT05 1 m 




�� 

�� 

Ordering Information Standard M2 with interchangeable probes 

Order code Specifi cation Power supply Applications 

M22D2HT-1X Duct-mount, 0...50 °C / 0...100 %rh 2 wire 4...20 mA, 10…35 VDC 

M22D2HT-4X Duct-mount, -30...70 °C / 0...100 %rh HVAC Applications 

M22W2HT-1X Wall-mount, 0...50 °C / 0...100 %rh Cold Rooms 

M22W2HT-4X Wall-mount, -30...70 °C / 0...100 %rh Storage rooms 

M23D2HT-1X Duct-mount, 0...50 °C / 0...100 %rh 12...35 VDC/24 VAC / 4...20 mA Semiconductor Industry 

M23D2HT-4X Duct-mount, -30...70 °C / 0...100 %rh 3/4 wires Light industry 


M23W2HT-4X Wall-mount, -30...70 °C / 0...100 %rh Any application, 

M23D5HT-1X Duct-mount, 0...50 °C / 0...100 %rh 15...35 VDC/24 VAC / 0...10 V where probes must 

M23D5HT-4X Duct-mount, -30...70 °C / 0...100 %rh 3/4 wires be easy to exchange. 



The probe length of all M2 standard duct-type transmitters is 250 mm; 100 mm for wall mount types. 

Order Codes Non-Standard Types M2 –please see table on page 51 

�� 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

49

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

50 

�� 

�� 

�� 


Ordering Information Standard Types M3 with Calculations & 

interchangeable Probes 

Order code Specifi cation Power supply Applications 

M33D2TC-4XW09 Duct-mount 

-30...70°C, -25...25°C / Dew-Point 

M33D2TC-4XW0B Duct-mount 

-30...70°C, -50...50°C / Dew-Point 


-30...70°C, 0...100 kJ/kg / Enthalpy 12...35 VDC/24VAC / 4...20 mA Snow Guns 

M33D2TC-4XW53 Duct-mount 3/4 wires Drying processes 

-30...70°C, 0...50 g/kg / Mixing Ratio (R) 


-30...70°C, 0...100 g/kg / Mixing Ratio (R) 

Wall mount-types are available on request; 

see order code table on next page 

M3 

The probe length of all M3 standard duct-type transmitters is 250 mm; 100 mm for wall mount types. 

Order Codes Non-Standard Types M3 – please see table on page 51. 

Humidity, calculated humidity (e.g. dewpoint, enthalpy) and temperature 

transmitter with interchangeable HygroClip S probes 

Key Features 

• Psychrometric calculations available (dewpoint, enthalpy etc.) 

• Probe interchangeable within seconds 

• Wall- and duct-mounting types 

• Measures humidity and temperature simultaneously 


• Large measuring range 


• High accuracy 

• Optional display 


• Temperature range –40…60°C; -30…60°C with display 

• Wire mesh fi lter provides sensor protection 

against dust and high air velocity. 

• IP rating: IP65 

HygroClip Probes for M-Series transmitters 

HygroClip S 



and high air velocity. Dimensions: Ø15 x 100 mm. 


Measurement range: -40…85°C , 0…100 %rh 


Order code: 

HygroClip S 

Extension cable with 

1 / 2 / 5 m cable length 

for HygroClip S probes and M-Series transmitters 

Order code: 



MOK-05-DAT05 5 m

Order Codes Non-Standard M Series 


Specifi cation 1 2 3 4 5 6 7 8 9 10 11 12 13 

Type M1 & M2 Integrated probe M 1 - 

Interchangeable probe 2 

Type of connection 2-wire 4...20 mA 2 

12...35 VDC, 24 VAC 3/4 wire 3 

Mounting Duct D 

Wall W 

Space S (M1 only) 

Output signal type 0...20 mA 1 

4...20 mA 2 

0...1 V 3 

0...5 V 4 

0...10 V 5 

Output parameters Humidity & temperature H T 

Humidity only H X 

Temperature only X T 

Output range 0…50°C / 0…100 %rh - 1 

Temperature & humidity 10…40°C / 0…100 %rh 2 

-40…60°C / 0…100 %rh 3 

-30…70°C / 0…100 %rh 4 

-40…85°C/ 0…100%rh 5 

0…100°F 6 

Options Display (not for M1) D 

No Display X 

Specifi cation 1 2 3 4 5 6 7 8 9 10 11 12 13 

Type M3 Interchangeable probe & calculation M 3 

Type of connection 12...35 VDC, 24 VAC 3/4 wire 3 

Mounting Duct D 

Wall W 

Output signal type 0...20 mA 1 

4...20 mA 2 

0...1 V 3 

0...5 V 4 

0...10 V 5 

Output parameters Humidity & calculated value H C 

Temperature & calculated Value T C 

Output range -30…70°C / 0…100 %rh - 4 

Temperature & humidity 0…100°F / 0…100 %rh 6 

Options Display D 

No display X 

Standard wire communication W 

Radio communication (M3 only) R 

Calculated parameter Dew-Point Dp in °C 0 

Wet-Bulb temperature Tw in °C 1 

Enthalpy H in kJ/kg 2 

Mixing ratio R in g/kg 5 

Output range 0…20 1 

Calculated value 0…25 2 

0…50 3 

0…100 4 

0…200 5 

0...500 6 

0...1000 7 

-20...20 8 

-25...25 9 

-40…40 A 

-50…50 B 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

51

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

52 

Technical Data Summary M-Line 

Features M 1 M 2 M 3 

Humidity sensor AC-1 

Temperature sensor Pt100 B Pt100 1/3 DIN 

Probe connections (combined %rh/°C) Fixed probe 1 for exchangeable HygroClip probes 

RS232 Service Interface Yes, by HygroPalm 

Display No Option 

Display units %rh, °C, °F, calculated parameters (M3 only) 

Resolution 0.1 %rh / 0.1°C 

Output signal type 0…1/5/10 V; 0/4…20 mA 

Trend indicator No Yes, with display option 

RS485 vernetzbar No Option 

Radio transmission No Option 

Serial number stored in EE-Prom Yes 

Scaleable analogue outputs Yes, with HW3 Software 

Remote Functions with HygroPalm 

1 point %rh, °C probe adjustment Yes 

4 point %rh, 2 point °C probe adjustm. Yes 

Reference adjustment Yes 

Calculation & Unit Display 

Psychrometric calculations No Yes 

Pressure compens. of calculated values No Possible with HW3 Software 

Standard pressure constant value No 1013.25 hPa 

Remote Transmitter Control 

Transmitter adjustment 1 point 1 point Multiple points 

Transmitter adjustment against 

reference probe Yes, with HygroPalm 

Transmitter measurement display Yes, with HygroPalm 

Transmitter status display Yes, with HygroPalm 

Operating range 

Operating range of electronics -40…60°C, with display -30…60°C 

Measuring Ranges (probes) 

Humidity 0…100 %rh 

Temperature Probe dependent; max. –40…100°C 

Accuracy at 23°C ±1.5%rh /± 0.3 K 

Reproducibility < 0.5% 

Long term stability < 1%rh / year 

Electrical Data 

Power supply 10(15)…35 VDC / 12…24 VAC or 2 wire 4…20 mA, 10…35 VDC 

Maximum load Current Output: < 250 Ohm; Voltage Output > 1000 Ohms 

Automatic load compensation No Yes 

Electrical connection Screw terminals on connection plate 

Mechanical Data 

Type of enclosure/ IP rating IP 65 

Sensor protection Type SP-W15 Wire mesh fi lter, stainless steel 

Housing material ABS 

Probe length/diameter for 

Duct type / Wall type 207/15/52/15 mm 250/15 mm/100 /15 mm 

Dimensions 154 x 73 x 48 mm 

Weight Ca. 300 g 

Schematics and dimensional diagrams see page 55 + 57

Roline-L Series Transmitters 

The Roline L transmitter has been designed for cost sensitive applications where the highest accuracy or 

widest measuring ranges are not required. Two versions are available, 2 wire 4…20mA loop and 3/4 wire 

formats for current and voltage signals. 

L12 

• 2 wire or 2x2 wire loop powered 4…20 mA 

• Integrated probe 

• Duct and wall mounting versions 

• Combined humidity and temperature measurement 

• Humidity or temperature only versions 



• Good accuracy 

• Temperature range 5…50°C 

• Humidity range 10…100%rh 

L13 

• 3/4 wire model for 10…35 VDC /12…24 VAC supply 

• 4…20 mA, 0…20mA, 0…10 V outputs 

• Integrated probe 

• Duct and wall mounting versions 

• Combined humidity and temperature measurement 

• Humidity or temperature only versions 



• Good accuracy 

• Temperature range 0…50°C 

• Humidity range 0…100 %rh 

Ordering Information Standard Versions Roline L 

Key features 

Roline-L Serie 

The transmitters that are defi ned in the table below represent the most popular versions. 

Customized versions may be ordered according to the table on the next page. 


• Good long term stability 

• All standard output signals 

available 

• Aesthetic housing 


� Easy to install 

� Reliable data and reduced 

maintenance 

� Compatible with most control 

systems 

� Suitable for public areas 

Orde code Description Supply / Output Applications 

L12DHT2 Duct-mount, 0…50°C / 0…100 %rh 2-wire 4…20 mA ; 10…28 VDC HVAC applications, 

low installation costs 

L12DHX2 Duct-mount, 0…100 %rh Humidity measurem. only 

L12DTX2 Duct-mount, 0…50°C Temp. measurement only 

L12WHT2 Wall mount, 0…50°C / 0…100 %rh HVAC applications, 


L12WHX2 Wall mount, 0…100 %rh Humidity measurem. only 

L12WTX2 Wall mount, 0…50°C Temp. measurement only 

L13DHT2 Duct-mount, 0…50°C / 0…100 %rh 3/4-wire 4…20 mA; HVAC applications, 

10 (15)…35 VDC; 12…24 VAC low installation costs 





L13WHX2 Wall mount, 0…100 %rh Humidity measurem. only 

L13WTX2 Wall mount, 0…50°C Temp. measurement only 

L13DHT5 Duct-mount, 0…50°C / 0…100 %rh 3/4-wire 0…10 V; HVAC applications, 

10 (15)…35 VDC; 12…24 VAC low installation costs 





L13WHX5 Wall mount,, 0…100 %rh Humidity measurem. only 

L13WTX5 Wall mount,, 0…50°C Temp. measurement only 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

53

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

54 

Roline-L Series Transmitters 

Ordering Information & dimensional diagrams Roline-L Series 

Features 1 2 3 4 5 6 7 

Roline-L types with integrated probes L 1 

Type of connection 2 wire loop power 4...20 mA 2 

12*...35 VDC, 3/4 wire 3 

Mounting Duct (Probe length 205 mm) D 

Wall ( Probe length 55 mm) W 

Output Parameters Humidity & Temperature H T 

Humidity only H X 

Temperature only T X 

Output Signal Type 0...20 mA (not for L12) 1 

* for 0/4…20 mA and 0…10 V outputs 

4...20 mA 2 

0...1 V (not for L12) 3 

0...5 V (not for L12) 4 

0...10 V (not for L12) 5 

Technical Data Summary Roline-L Series 

Specifi cations L 12 L13 

Humidity sensor Hygromer AC-1 

Temperature sensor Pt 100 B 

Output signal type 2 x 2 wire 4…20 mA loop power 0…1/5/10 V; 0/4…20 mA 

Probe adjustment In conjunction with HygroPalm handheld instrument 

Operating & measuring ranges 

Humidity 0…100 %rh, non condensing 

Temperature -40…60°C 

Air speed duct type 20 m/s max. 

Temperature compensation Yes 

Accuracy at 23°C ±3 %rh; ±0.5 K 

Reproducibility < 0.6 %rh / 0.5 K 

Long Term Stability < 1.5 %rh/Year 

Power Supply 2 wire 4…20mA loop power; 10…28 VDC 10(15)…35 VDC 

Power consumption Max. 20 mA /output < 50 mA 

Max. load

M-Series & Roline-L Series 

ACML 232 

ACRL 

ACRLXB5 

ACRLYB5 

Schematics and dimensional diagrams 

Schematic diagrams 3/4 wire supply 2 or 2x2 wire supply 

Service cable 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

55

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

56 

The I-1020 series has been ROTRONIC’s best selling product for industrial applications for many years, and 

is still in great demand, especially in 2x2 wire loop power applications. This is why ROTRONIC still produces 

the I-1020 despite of the availability of the HygroFlex series. Its high precision, reliability and extensive 

range of confi guration options make it ideally suited to the most stringent demands of the industrial sector. 

Ø 25 Ø 15 

A B 

L 

A = 150 mm 

B = 100 / 250 / 400 / 550 mm 

L = 250 / 400 / 550 / 700 mm 

L 

Ø 15 

(130 mm to 80 °C) 

L = 100 / 130 / 250/400/ 

550 / 700 mm 

Cable lengths 1 m / 2 m 

L 

(130 mm to 80 °C) 

Cable lengths 1 m / 2 m 

L 

L = 120 / 270 / 420 mm 

Transmitter I-1020 

L 

L = 100 mm 

Ø15 mm 

L = 100 / 130 / 250 / 400/ 

550 / 700 mm 

Ø15 mm 

I-1020 

Key features 

• Excellent precision and long-term stability 

• Wall, duct or cable mounting 

• Measurement of relative humidity & temperature 

• Wide operating ranges: 0…100 %rh, -50…150°C 

• 2x2 wire loop power output : 4…20 mA 

Probes 

Passive PPS probe with sealed cable, used for all three mounting confi 

gurations. 

Advantage: No hollow spaces, therefore no possibility of leakage or 

trapped condensation. Various combinations of transmitters 

and probes are available for the different demands 

in all types of applications 

Wall mount type P 

Temperature range: -20...50°C 

Length: 100 mm 

Probe: PPS, sealed against condensation 

Duct Mount Type A 

Standard probe length: 250 mm 



Duct Mount Type P 

Standard probe length: 250 mm 



Cable mount type P 



Cable lengths: 1 or 2 m 

Cable mount type M (option) 


Probe: Steel V2A 

Cable lengths: 1 or 2 m 

Length: 120 / 270 / 420 mm 

Diameter: 15 mm

Sensor protection, fi lters 

M-Series Schematics Model M3 with calculation 

M1 M2 + M3 

I-1020 Sensor protection, fi lters 

The robust slotted cap also functions as a fi lter holder and provides mechanical protection when the fi lter 

element is removed. 

SP-MSB15 

Metal slotted cap 

mounted over sensor 

Order code, fi lter, fi lter type, properties 

Function: Protects sensors against pollution and 

high air velocity (up to 40 m/s). 

A fi lter is required for air velocities from 3 m/s. 

Steel sinter fi lter SP-S15 

Wire mesh fi lter SP-M15 

Tefl on fi lter SP-T15 

Order code Type of fi lter Properties Max. air velocity 

SP-S15 Steel sinter fi lter element High level of fi ltration 

pore size ca. 5µ Marginal effect on response times 

Not suitable for very high humidity applications 40m/s 

SP-M15 Wire mesh fi lter element Minimal measuring delay 

Mesh size ca. 20–25µ Reduced fi ltration effi ciency for small particles. 

Suitable for high humidity applications 20m/s 

SP-T15 Tefl on fi lter element Good fi ltration effect 

pore size ca. 10µ Extends response time in low air velocity 

Water repellent but water vapour permeable 20m/s 

Power Supply 

+ 1 Supply, max. 35 V DC, 24 V AC 

– 2 GND (common) 

+ 3 Temperature [V, mA] 

+ 4 Calculated value [V, mA] 

+ 5 

] RS485 

– 6 

Dimensional Diagrams M-Series 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

57

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

58 

I-1020 

Order code table series I-1020 

Parameter column number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 

Example: 1 - 1 0 2 2 C C 0 2 P 3 C W 1 V 1 X 

Supply voltage: 2x2 wire 4…20 mA 2 

Temperature measuring range 

No temperature measurement 0 T 

0…50°C 1 C 

0…100°C 2 C 

0…150°C 3 C 

–30…70°C 4 C 

other in °C 9 C 

0…10°F 1 F 

0…200°F 2 F 

other in °F 9 F 

Type of mounting 

Wall (100 mm probe length) W X X 

Duct R X X 

Cable-probe 1 m (incl. probe) C 0 1 

Cable-probe 2 m (incl. probe) C 0 2 

Probe type 

PPS probe type A 25/15 mm Ø A 

PPS probe type P 15 mm Ø P 

Metal probe 15 mm Ø (Cable type only) M 

Probe length 

Mounting type W and C: 100 mm 

Metal probe: 120 mm Not available for probe type A 1 

Mounting type R und C: 130 mm (up to 80°C) Not available for probe type A 2 

Mounting type R und C: 250 mm Metal probe: 270 mm 3 

Mounting type R und C: 400 mm Metal probe: 420 mm 4 

Mounting type R und C 550 mm 5 

Mounting type C 700 mm 7 

Measured parameter 

Humidity & Temperature measurement C W 

Temperature measurement only C T 

Output signal: 

Current: 4…20 mA, 2 wire 6 A 

Current: 2x4…2 0mA, 2x2 wire 8 A 

Cable connections: 

1 M16 cable gland 1 

Tuchel plug 7 pin 7 

Special version 9 X 

Filter options 

to be ordered separately 

Order code: 

SP-S15 Steel sinter fi lter element 

SP-M15 Wire mesh fi lter element 

SP-T15 Tefl on fi lter element 

Service cable for adjusting of the transmitters 

Order code: 

ET-86.1708.0501

Technical data series I-1020 

Humidity sensor HYGROMER ® IN-1 

Temperature sensor Pt100 1/3 DIN 

Operating range 


Temperature (sensor) -50…150°C 

Temperature (Electronics) -20…50°C 

Technical data series I-1020 

Air velocity Without fi lter up to 3m/s, with fi lter up to 40m/s 

Measuring range 


Temperature See order code table 

Temperature compensation: Within temperature range 0…100°C 

Output signals humidity and temperature 2-wire loop power 4…20 mA 

Accuracy humidity at 23 ±2°C Humidity ±1.5 %rh, 0…100 %rh 

Temperature ±0.3 K 

Reproducibility 0.5 %rh, 0.1 K 

Long-term stability

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

60 

Dimensions of the electronics housing 

I-1020 

Order codes Screw fi tting Probe Ø max. temperature AG H (mm) Flange 

AC1301 Perbunan 15 mm 100 °C 1⁄2"G 28 AC 1305 

AC1301-M* Perbunan 15 mm 100 °C M 25 x 1.5 26 On request 

AC1302 Perbunan 25 mm 100 °C 1"G 33 AC 1306 

AC1302-M* Perbunan 25 mm 100 °C M 32 x 1.5 31.5 On request 

AC1303 Viton 15 mm 200 °C 1⁄2"G 28 AC 1305 

AC1303-M* Viton D 15 mm 200 °C M 25 x 1.5 26 On request 

AC1304 Viton 25 mm 200 °C 1"G 33 AC 1306 

AC1304-M* Viton 25 mm 200 °C M 32 x 1.5 31.5 On request 

* M = Metric thread 

I-1020 

Fitting Flange Version B 

Remark: 

The dimensions in brackets apply to probes with 25 mm Ø. 

Aluminium housing 

on request 

Mounting accessories for all transmitters with 15 mm probes 

1. Wall mounting: no accessories required. Electronics housing mounted on wall. 

2. Duct mounting: 

A: Electronics housing mounted on air duct. No accessories required 

B: Probe mounted by AGRO screw fi tting and fl ange ( Duct and cable types) 

The fl ange is only required, if the AGRO screw fi tting cannot 

be fi xed alone; e.g in small ducts with no access

Installation of ROTRONIC transmitters is easy. The various models can be mounted either by a mounting 

plate, onto which the whole transmitter is fi xed, by a connecting plate, which is screwed onto the wall or 

duct, or by direct mounting onto a duct by fi xing the probe with an AGRO fi tting. See also previous page. 

Mounting of M-Series Transmitters 

1. Mount the base/mounting 

plate onto the wall and connect 

the wiring. 

2. Plug in the probe/electronics 

module 

The base/mounting plate is 

absolutely identical to the old 

versions of the FTW65, DPT and 

FH types. 

The M1 space mount version 

features a retractable probe. 

This is especially convenient for 

calibration. In areas with no air 

movement, the measurement is 

much more accurate due to the 

better adaptation to the temperature. 

Mounting of Roline-L Types 

Fix the housing by screwing it directly 

onto the wall, or by means 

of an AGRO fi tting. 

Mounting of I-1020 types 

52 

52 

Installation and Maintenance 

M1 M2 + M3 

The I-1020 type can be screwed onto a duct or wall by 4 screws located 

inside of the housing, or by an AGRO fi tting in the same manner as 

M-series or Roline-L series. Fixing by means of a screw-fi tting is also 

possible. 

Maintenance 

ROTRONIC transmitters require hardly any maintenance. Due to the 

excellent long term stability, a calibration interval of one year will be 

suffi cient in most cases. However, in some applications, it may be 

advisable to perform more than one calibration per year. For detailed 

calibration information, please refer to the chapter calibration. 

In dusty and otherwise polluted environments, the sensor protection 

fi lters require some maintenance. We recommend to have a spare 

fi lter ready and to exchange it on site. The replaced fi lter may be 

cleaned in the workshop with soap and water. Ultrasonic cleaners may 

also be used. Let the fi lter dry thoroughly before re-use. 

40 

40 

ø82 

90 

101 

ø82 

90 

101 

ø15 

ø15 

~155 

~155 

18.5 

18.5 

~43 

~43 

40 

40 

207 

Probe 

Sensors 

207 

ø15 

ø15 

~40 

~40 

Electronic 

housing 

Sensors 

ø82 

~103 

ø82 

~103 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

61

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

62 

What is the HygroClip? 

HygroClip Introduction 

The HygroClip ® is a high quality probe for the measurement of humidity and temperature. 

It is used in a wide range of applications including handheld instruments, data-loggers and transmitters. It 

provides digital and analogue output signals for both temperature and humidity. The humidity is measured 

in the range of 0…100%rh, corresponding to 0…1V; the temperature between either –40…85°C = 

-0.4…0.85 V, or –40…60°C = 0…1V. The two versions are distinguishable by different colours of the housing 

material. The digital one-wire data signal is ideally suited for OEM applications. The probes may 

be adjusted digitally by either software or handheld instruments. Calibration data is stored in an EE-Prom. 

Thus, the probes may be used in any ROTRONIC display instrument or transmitter and even in OEM instruments 

without the need for on-site adjustment. ROTRONIC offers an exchange service for the HygroClip 

probes. Every refurbished HygroClip comes with a new sensor, fully calibrated and with a factory certifi cate. 

Make use of the experience of ROTRONIC, and the revolutionary advantage of exchangeability. Being the 

fi rst supplyer in the world-wide market, we already satisfi ed the needs of thousands of customers. In continuous 

contact with our customers, we expand the advantages of the products to the benefi t of our customers. 

Key features 

• Simple replacement within seconds 

• No on-site adjustment necessary 

• Global availability from stock 

• Digital output signal 

• Analogue interface 

• Wide range of supply voltage 

OEM applications and advantages 


� Negligible down-time; reduction of servicing costs 

� No specifi c knowledge required 

� Available from your local dealer 

� High accuracy and interchange ability 

� Also suitable for analogue display instruments 

� Suitable for almost every OEM instrument 

The availability of digital and analogue output signals and the wide supply voltage range of 3.5 to 50 VDC 

makes the HygroClip suitable for a wide variety of applications. The application range of 0…100 %rh and 

–40 to 85°C is unique. 

HygroClip S is the standard-type. However, ROTRONIC is capable of manufacturing customized types according 

to your requirements. The HygroClip is ideally suited as an integral part of complete humidity and 

temperature measurement systems, such as: 

• Display devices 

• Process control applications 

• Multi channel data loggers 

• Handheld instruments 

• High precision climate control 

• Electronic cabinets 

• Incubators and environmental chambers 

• Fermentation chambers 

• EDP applications 

• Gas detection systems & portable instrumentation 

• Air-conditioned containers 

Section contains 

HygroClip Probe 

� Standard HygroClip S 

� HygroClip S3 for meteorological applications 

� Accessories for HygroClip probes


Universal probe for various applications 

Very small size-suitable for 

many application 

IP-65 protection 

Available for standard and 

meteorological application 

3.5...50 VDC Supply voltage 

OEM-types available 

HygroClip 

Replaceable sensor 

protection fi lter 

Body fi lled with resin 

to avoid condensation 

Analogue and digital 

interfaces 

Sockets with lockring 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

63

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

64 

HygroClip S and Accessories 

HygroClip S, HygroClip S3 

• 100% interchangeable 

• 1 digital output and 2 analogue outputs 

• ROTRONIC Hygromer humidity sensor 0…100 %rh 

• Accuracy ±1.5 %rh 

• Long-term stability better than 1 %rh/year 

• High precision Pt100 temperature sensor 

• HygroClip S3 (white) temperature range 

of 0…1V for –40…60°C 

Order code: 

HygroClip S (anthracite) –40…85 °C = –0.4…0.85 V 

HygroClip S3 (white) –40…60 °C = 0…1 V 

HygroClip R (standard, refurbished) 

HygroClip R3 (white, refurbished) 

MOC, MOC3 

• Mounting connector for HygroClip S 

• 30 cm connecting wires 

• Mounting hole 12.7 mm diameter or PG7 thread 

• HygroClip connector with bayonet locking ring 

• MOC3 in white for HygroClip S3 

Order code: 

MOC (anthracite) 

MOC3 (white) 


• HygroClip S with miniature cable probe: 

Length = 51mm, diameter = 4/5mm, length of probe cable = 2m 

• 100% interchangeable 

• 1 digital and 2 analogue outputs 

• ROTRONIC Hygromer humidity probe 0…100 %rh 

• Accuracy ±1.5 %rh / ±0.3K 

• Long-term stability less than 1 %rh drift per year 

• Temperature sensor Pt100 1/3 DIN 

• Probe operating temperature –30 °C…100°C 

Order code: 

HygroClip SC04 4 mm Ø probe 

HygroClip SC05 5 mm Ø probe 

MOK, MOK3 

Passive extension cables for HygroClip S and S3 (no electronics) 

• 1…5m connection cable with stripped wires 

• 5 pin connector or DAT05 connection to extend cable length 

Active adapter: with integrated amplifi er 

• Ranges 0…1V, 0…2,5V, 0…5V, 0…10V 

at 0…100%rh and, for example -40…60°C 

• Length of connection cable up to 20m 

• MOK3 in white for HygroClip S3 

Order codes: 

see next page

Order codes passive MOK adaptors 

Order codes passive adaptors 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 

Standard type (anthracite) M O K - 

White housing 3- 

Cable length: 1 m 0 1 

2 m 0 2 

5 m 0 5 

Stripped wires - X X 

Binder 5 pin connector B 5 

DAT05 connector (HygroClip-plug) D A T 0 5 

Order codes active adaptors 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Remarks 

Anthracite housing (Standard type) M O K - 

White housing 3- 

Cable length: 1 m 0 1 

2 m 0 2 

5 m 0 5 

10 m 1 0 

20 m 2 0 

Stripped wires X X 

Output signal Max. cable length: 

0…1 V (min. supply 5.5 V) - 0 0 1 V 2 m 

0…2.5 V (min. supply 5.5 V) 0 2 5 V 5 m 

0…5 V (min. supply 10 V) 0 0 5 V 10 m 

0…10 V (min. supply 15 V) 0 1 0 V 20 m 

Temperature range - 

0…100°C ( not possible for MOK3-XX) 1 

-30…70°C (not possible for MOK3-XX) 2 

-40…60°C 3 

Load: 1 kΩ/V 

HygroWin 

• Probe for direct connection to a PC 

• Measuring range 0…100 %rh, -40…85°C 

• Accuracy ±3 %rh, ±0.5 K 

• Comprehensive software with data storage 

• Low cost 

Order code: 

HygroWin 

MOK-WIN 

• Adapter cable for direct connection of HygroClip S to your PC 

• Cable lengths: 1m, 2m, 5m 

• Comprehensive software with data storage 

Order code: 

MOK-01-WIN (with 1 m cable) 



Note: HygroClip probe must be ordered separately 

Reference HygroClips 

Reference HygroClips generate a fi xed value for temperature und humidity 

in digital format. As the accuracy of digital values is absolute, 

the user can calibrate the system with them. 


Order code: 

HygroClip-S-35RH/15C simulates 35%rh and 15°C (others on request) 

HygroClip-S-65RH/25C simulates 65%rh and 25°C 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

65

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

66 


HPH Signal Booster 

• Allows cable lengths up to 99 m 

• Cable length compensation, therefore no measuring errors when 

using long cables 

• ROV interface (10 mV/ %rh, 10 mV/ °C, 0 %rh, 0°C = 0V) 

Ordering information HPH 

Order code Description 

Technical data of the HPH signal booster 

Outputs Humidity 0…100 %rh = 0…1 V 

HPH-CG05B5 Booster, 5 m connecting cable with Binder 5 pin connector 

HPH-CG99B5 Booster, conn. cable up to 99m selectable, Binder 5 pin conn. 

HPH-CG05XX Booster, 5 m connecting cable, stripped wires 

HPH-CG99XX Booster, connecting cable up to 99m selectable, stripped wires 

Temperature -40…85°C= 0.4…0.85 V 

Cable length 5…99 m 

Cable compensation Up to 99 m 

Connecting cable Open terminations or 5 pin connector 

HygroClip Technical data, Order Information 

Supply voltage HygroClip 3.5…50 VDC 

Current consumption HygroClip Ca. 4 mA 

Operating range Humidity /Temperature 0…100 %rh / -40…85°C 

Accuracy at 23 °C Humidity /Temperature ±1.5 %rh / ±0.3 K 

Output signals HygroClip S Humidity /Temperature 0…100 %rh = 0…1V / -40…85°C = -0.4…0.85V 

HygroClip S3 Humidity /Temperature 0…100 %rh = 0…1V / -40…60°C = 0…1V 

Digital output signal One Wire DIO 

Start up time 2.7s fi rst measurement; 0.7s subsequent 

Resolution: Humidity 100 %rh / 12 bit analogue, 16 bit digital 

Temperature 250°C/12 bit analogue, 16 bit digital 

Adjustment Via PC (EE-Prom) or compatible instrument 

Sensors Humidity / Temperature Hygromer AC-1 / Pt100 1/3 DIN 

Output load >10 kOhm 

Cable length max. 5m 

Sensor protection Wire fi lter (max. 20m/s) 

Dimensions with MOC 100 x 15 mm 

Type of enclosure IP65 

Colour HygroClip S Anthracite RAL 7016 

HygroClip S3 White 

Pin and colour confi guration MOC, MOK, MOK-WIN 

MOC, stripped wires MOK B5 Plug HPH B5 Plug MOK-WIN 

Term Wire colour Pin Wire colour Pin Wire colour Term D-sub 25 plug 

+VDC Green 2 Green 2 Green TXD 2 

GND Black 3 Grey and Blue 3 Grey RXD 3 

Shield (GND) N/C 3 Shield N/C RTS 4 

Temperature Brown 1 1 Brown SG 7 

Humidity White 5 5 White DTR 20 

DIO Signal Red 4 Yellow 

Compensation N/A N/A N/A 4 Yellow

HygroClip 

HPH Signal Booster 


Pin Colour Function 

1 brown Temperature 

2 green +VDC 

3 black GND 

4 yellow DIO 

5 white rel. humidity 

Pin Colour Function 

1 brown Temperature 

2 green +VDC 

3 grey GND 

4 yellow Compensation 

5 white rel. humidity 

T 

R 

A 

N 

S 

M 

I 

T 

T 

E 

R 

S 

67

M 

E 

T 

E 

O 

R 

O 

L 

O 

G 

Y 

68 

In meteorology, the accuracy of the measurements is essential for accurate forecasting and decision-making. 

ROTRONIC humidity probes have an excellent reputation for providing reliable results even in the most 

demanding conditions where high humidity and low temperatures pervade. Our current product range 

offers high performance, a wide range of confi gurations and price levels compatible with any application’s 

demands. 

Especially with respect to humidity measurement, it is essential to carefully consider correct temperature. 

Relative humidity is very temperature dependent. In recognition of this fact, ROTRONIC has developed a 

range of enhancements to improve temperature effects and measurement accuracy. These include ventilated 

weather and radiation protection shields that provide very good shelter from rain, snow and radiation, 

and most importantly, improve the performance of temperature measurement. 

Why is correct temperature essential? 

In the past, temperature and humidity probes have been built into weather stations, or screens (Stevenson) 

usually made of wood and painted white. Despite of the white colour, the screens tended to heat up by 

suns radiation, and the deviation from actual temperature could be quite high. Such a deviation obviously 

must lead to incorrect measurement of the humidity, because relative humidity is so dependent of temperature. 

Example: 

Meteorology 

Assuming an absolute humidity Q of 5 g/kg, the relative humidity at 20 °C is 34.74 %rh; at 21 °C 32.66 %rh 

and at 19 °C 36.97 %rh. Hence, it becomes obvious that a wrong temperature must lead to a wrong humidity 

value. 

ROTRONIC ventilated weather stations minimise thermal effects and provide for better temperature accuracy, 

as the probe is not heating up in the sun. The airfl ow constantly cools the shield, whilst air temperature 

is measured at the air inlet. 

Key features 

• High accuracy and stability 

• Probe exchange without tools 

• Digital probes 

• Ventilated shields 

• Compact mounting system for 

various probes 

• Easy mounting 


� Reliable measurement data and low maintenance costs 

� Saves installation and on-site costs 

� No on-site calibration required 

� Optimum temperature performance 

� One shield for all probe types 

� Saves installation and on-site costs 


Ventilated Weather Protection Shields VHTS2 70 

Non-Ventilated Weather Protection Shields 

Probe adaptors for VHTS2 

Analogue Meteorological Probes 71 to 75 

Digital HygroClip Probes 

MOK Adaptors for HygroClip S

Meteorology Applications 

ROTRONIC Weather Station for Temperature and relative Humidity 

Snowguns 

Weatherstations 

BMS/HVAC applications 

Agronomical applications 

Alpine observation applications 

Ice warning systems 

M 

E 

T 

E 

O 

R 

O 

L 

O 

G 

Y 

69

M 

E 

T 

E 

O 

R 

O 

L 

O 

G 

Y 

70 

Weather and Radiation Protection 

Ventilated weather/radiation protection 

Designed to minimise the infl uence of thermal radiation on humidity 

and temperature measurements. Provides optimum protection even in 

horizontally driving wind and rain. 

Key features 

• Easy-to-install protection shield with built-in ventilator 

to prevent heating-up of probe and shield 

• Special white paint against radiation 

• Probe mounting without tools 

• Various adaptors for different probes 

• 12 V or 24 V fan supply 

Order code: Suitable for Fan supply 

VHTS2-W-T7/12 MP100 / MP400 probes 12 VDC 

VHTS2-W-T7/24 24 VDC 

VHTS2-W-C/12 

12 VDC 

MPH probes 

VHTS2-W-C/24 24 VDC 

VHTS2-W-M/12 

12 VDC 

HygroClip with MOK adaptors 

VHTS2-W-M/24 24 VDC 

VHTS2-W-I/12 

12 VDC 

HygroClip industrial probe IC3 

VHTS2-W-I/24 24 VDC 

Adaptors for retrofi tting older shields with a thread in the 

lower end of the tube are available. 

Order code: Used for probe type: 

VHTS-X-MP1 MP100-series 

VHTS-X-MP4 MP400-series 

VHTS-X-MPH MP100H /MP400H series 

VHTS-X-MOK HygroClip probes with MOK adaptors 

VHTS-X-IC3 HygroClip IC3 probes 

VHTS-X-SCREW Screw for all types; must always be ordered 

separately 

VHTS2-SP Option Snow protection 

Weather and radiation protection shield 

with natural ventilation 

The naturally ventilated shield is recommended for applications where 

the accuracy is less important than in meteorology applications. 

Fairly good protection against radiation and precipitation with natural 

ventilation. 

Suitable for humidity and temperature probes series MP100A, 

MP400A, MP100H, MP400H 

Protects even against horizontally driving wind and rain up to 68 km/h 

Including probe protection tube 

Order code: Suitable for: 

AC1002/AC1012 MP100A series 

AC1003/AC1012 MP400A, MP100H, MP400H 

AC1002/AC1012/AC1015 HygroClip S 

AC1004 For HygroClip S3C03 probes, HygroClip S+MOK

MP100A with linear voltage output 

MP400A with linear current output 

Order codes of non-standard types MP100 & MP400 

Specifi cation 1 2 3 4 5 6 7 8 9 10 11 12 13 14 

Example: M P 1 0 1 A - T7 - W 4 W 

Output signals: Voltage M P 1 0 

Specifi cation: 

Humidity: 0…1 VDC = 0…100 %rh 

Temperature: -0.4…0.6 V=-40…60°C 1 

0…1 VDC= -30…70°C 2 

0…1 VDC=-40…60°C 3 

Auxiliary Pt100 for 4/4 wire connection 6 

Output signals: Current M P 4 0 - - 

Common terms for MP100 & MP400 

MP100A / MP400A 

Key features: 

• Accuracy and long term stability 

• Resistant to condensation and air-borne pollutants 

• Temperature operating range: -40…60°C 

• Temperature measurement by direct Pt100 resistance or linear 

analogue output 

• Cable length compensation circuit; no signal errors for cables up to 100m 

• Universal power supply 4.8…30 VDC 

Order codes of standard types: 

Humidity Range: 0…100 %rh = 0…1 V / 4…20 mA 

Order code Temperature range Tuchel plug Cable compensation (see page 75) 

MP101A-T4-W4W 

Tuchel 4 pin 

-0.4…0.6 V = -40…60°C 

MP101A-T7-W4W Tuchel 7 pin Yes 

MP102A-T4-W4W 

Tuchel 4 pin 

0…1 VDC = -30…70°C 


MP103A-T4-W4W 

Tuchel 4 pin 

0…1 VDC = -40…60°C 


MP106A-T7-W4W Direct Pt100 Tuchel 7 pin 

MP408A-T4-W4W 4…20 mA = -40…60°C Tuchel 4 pin N / A 

MP408A-CGXX-W4W 

4…20 mA = -40…60°C N / A 

0…20 mA = 0…100 %rh /Pt100, 4 wire 0 

4…20 mA = 0…100 %rh /Pt100, 4 wire 1 

4…20 mA = 0…100 %rh /2 wire, %rh only 2 

4…20 mA= 0…100 %rh/2 wire,/Pt100 4 wire 3 

0…20 mA = 0…100 %rh 0…100°C 4 

0…20 mA = 0…100 %rh -40…60°C 5 

0…20 mA = 0…100 %rh -30…70°C 6 

4…20 mA = 0…100 %rh 0…100°C 7 

4…20 mA = 0…100 %rh -40…60°C 8 

4…20 mA = 0…100 %rh -30…70°C 9 

Cable type 

Version: A 

XX = cable length in m 

Integrated plug: Tuchel 4 pin connector T4 

Tuchel 7 pin connector T7 

Connection cable: PUR cable, grey CG 

Cable length: 2m (for example) 02 

Cable plug: Cannon 4 pin connector C4 

Without plug, stripped wires 00 

Sensor protection: Wire fi lter 

Operating range: -40…60 °C 

Humidity sensor: IN-1 

M 

E 

T 

E 

O 

R 

O 

L 

O 

G 

Y 

71

M 

E 

T 

E 

O 

R 

O 

L 

O 

G 

Y 

72 

Order codes standard types: 

Order codes for non-standard probe MP100H & MP400H 

Specifi cation Column No. 1 2 3 4 5 6 7 8 9 10 11 12 13 

Basic model voltage output MP100H- 

Basic model current output MP400H- 

Without auxiliary Pt100 0 

With auxiliary Pt100, active signal 1 

With auxiliary Pt100, passive signal 2 wire 2 



Output signal for MP100H 

0…1 V = 0…100 %rh, -40…60°C = -0.4…0.6 V 1 

0…1 V = 0…100 %rh, -30…70°C 2 

0…1 V = 0…100 %rh, -40…60°C 3 

Output signal for MP400H 

MP100H / MP400H 

MP100H/MP400H with interchangeable 

HygroClip probe 

Humidity Range: 0…100 %rh = 0…1 V / 0(4)…20 mA, 3 m cable length 

Order code Temperature range Remarks 

MP100H-010300 -0.4…0.6 V = 40…60°C 

MP100H-030300 0…1 V = -40…60°C 

Key features: 

• Humidity and temperature measurement using interchangeable 

HygroClip sensor module (see chapter on HygroClip products) 

• Temperature measurement option: accurate measurement by additional 

direct Pt100 sensor 

• Temperature operating range: -40…60°C 

• Current or voltage output signal 

MP100H-130300 0…1 V = -40…60°C Auxiliary Pt100, active signal 

MP400H-050300 0…20 mA = -40…60°C 

MP400H-080300 4…20 mA = -40…60°C 

MP400H-180300 4…20 mA = -40…60°C Auxiliary Pt100, active signal 

0…20 mA = 0…100 %rh, 0…100°C (max. 60°C) 4 

0…20 mA = 0…100 %rh, -40…60°C 5 

0…20 mA = 0…100 %rh, -30…70°C 6 

4…20 mA = 0…100 %rh, 0…100°C (max. 60°C) 7 

4…20 mA = 0…100 %rh, -40…60°C 8 

4…20 mA = 0…100 %rh, -30…70°C 9 

PUR connection cable (3m standard) 0 3 

Maximum 99m 9 9 

7 pin Tuchel plug (not for 3/4 wire auxiliary Pt100) T 7 

Stripped wires 0 0 

Auxiliary temperature sensor Pt100 1/3 DIN - 0 3 D I N 

Pt100 1/5 DIN 0 5 D I N 

Pt100 1/10 DIN 1 0 D I N

HygroClip S3C03 for agricultural applications 

Typical applications include weather stations and data acquisition 

systems. Available with 3 m cable, stripped wires 

• Precise and stable measurement of temperature and humidity 

• Economical price 

• Confi gured for outdoor measurements 

• Compact dimensions 

• Weather protection shield available 

• Technical data equal to HygroClip S3, except cable 

Measurement range: 

HygroClip S3: -40…60°C, 0…100 %rh = 0…1 V 


Order code: 

HygroClip S3C03 

HygroClip S3 



and high air velocity. 

Dimensions: Ø15 x 100 mm 


HygroClip S3 is designed for meteo applications. 

Measurement range: 

HygroClip S3: -40…60°C, 0…100%rh = 0…1 V 


Order code: 

HygroClip S3 

HygroClip S3C03 

MOK Adaptors for Meteo Applications with HygroClip Probes 

The MOK adaptors provide a simple and low cost means 

of connecting a HygroClip probe to a 5 V signal processing 

device. They are used in conjunction with the weather 

protection shields. 

Output signal: 0…5 V = 0…100 %rh/-40…60°C 

Cable length: 5 m 

Supply: min. 5.5 V, max. 26.5 V 

Order code: 

MOK3-05-XX-005V-3 

Other types available on request. (See page 65) 

M 

E 

T 

E 

O 

R 

O 

L 

O 

G 

Y 

73

M 

E 

T 

E 

O 

R 

O 

L 

O 

G 

Y 

74 

Technical Data 

Technical data, MP100A, MP400A, MP100H, MP400H 

Series MP100A MP100H MP400A MP400H 

Protection (IP-rating) IP65 

Option: humidity only (2 wire, 3 wire) Yes N/A Yes N/A 

Output signal Voltage Current 

Supply voltage 4.8…30 VDC Min. 8 VDC +0.02 x load 

Power consumption: 

4 wire with current output N/A 50 mA 45 mA 

2 wire with current output N/A 20 mA 

4/5 wire with voltage output 6 mA 10 mA N/A 

3/4 wire with voltage output 3.5 mA 10 mA N/A 

Load >1000 Ω

Dimensional Diagrams MP100A / MP400A 

30 

25 

210 

40,5 

Dimensional Diagrams MP100H / MP400H 

Pinning of Tuchel Plugs for MP100 & MP400 Series 


MP100A-T7 MP100A-CG 

TUCHEL PLUG 7P 

HOUSING: WHITE 

Cable Length Compensation 

The integrated cable length compensation allows the use of a connection 

cable up to 99 m long, without an adverse affect on measurements. 

The additional “0” cable wire is connected according to the 

diagrams shown. 

The combination of ROTRONIC instruments with ROTRONIC cables 

includes the cable length compensation facility as standard. 

The connection from probe to display instrument consists of a 5 core 

cable, where the shielding may also be used for the common earth. 

The “0” cable compensation is connected to the common earth 

“GND” at the display instrument. It is possible to use the probe with 

a non-ROTRONIC instrument, such as a data-logger, chart recorder or 

controller and retain the compensation, by connecting the cable compensation 

“0” to the common earth “GND” of the termination point 

(the load). 

The cable compensation “0” can be connected with the common earth 

“GND” at the plug, if a 5core cable is extended by a 5core cable. If this 

is terminated by a 4pin plug, in this case the cable compensation is 

effective in the 5 core cable up to the 4pin plug. 

Probes with integrated 4 pin connector: 

The cable compensation is effective up to the connector. 

52 

7 

PG7 WITH KINK PROTECTION 

HOUSING: WHITE 

MP100H / MP400H /-0 MP100H /MP400H / 1…4 

Tuchel T4 Tuchel T7 MP100 Tuchel T7 Auxiliary Pt100 

252 

40,5 

M 

E 

T 

E 

O 

R 

O 

L 

O 

G 

Y 

75

W 

A 

T 

E 

R 

A 

C 

T 

I 

V 

I 

T 

Y 

76 

Water Activity 

The measurement of Water Activity, or Equilibrium Relative Humidity, as it is sometimes known, is a key 

parameter in the quality control of any moisture sensitive product or material. 

ROTRONIC have designed and manufactured instruments for the measurement of Water Activity for over 30 

years. Our product range is based on our comprehensive application experience, which when combined with 

the very latest digital technology and software, offers the user the ideal combination of features, performance 

and competitive pricing. 

Water activity Contaminant 

a w = 0.91…0.95 most bacteria 

a w = 0.88 most yeast 

a w = 0.80 most mildew 

a w = 0.75 halophile bacteria 

a w = 0.70 osmiophile yeast 

a w = 0.65 xerophile mildew 

Key features 

Why is water activity measured? 

Water activity defi nes the active part of a product’s moisture content, 

or ‘free’ water. It infl uences the microbiological, chemical and enzymatic 

stability of perishable products such as foods, grain and seeds. 

The table shows typical growth thresholds below which the specifi ed 

contaminant cannot replicate, and therefore spoil the product. Control 

of water activity therefore has a signifi cant impact on shelf life. 

For similar reasons, water activity is equally relevant in the pharmaceutical 

industry where it also provides useful information regarding 

properties such as the cohesion of tablets, agglomeration of powders, 

and adherence of coatings. 

• Wide operating range 

• Aw Quick mode 

• High measurement precision 

• Long Term Stability 

• Interchangeable measurement stations 

• Multi channel display units 

• Validated PC analysis software 

Section contents: Page 

HygroLab Laboratory Display Units/Analysers 80 

� Digital technology 

� Multiple probes inputs 

� Networkable 

� Validated, easy to use software 

HygroPalm AW Portable Analysers 81 

� Digital technology 

� Integrated AW quick function 

� Measurement sets 

HygroClip water activity stations and probes 82 to 83 

� Wide range of measurement options to suit any application 

� Digital calibration 

� 100% interchangeable without adjustment 

Accessories for Water Activity measurement 84 

� Sample holders 

� Disposable sample containers 


Water Activity Theory and reference, Technical Data 85 to 87 

� What is water activity? 

� Water activity or moisture content? 

� Suitable for any product or application 

� Results in 4…6 minutes 

� Reliable data every time 

� Reduced maintenance and calibration 

� Simple calibration & maintenance 

� 2 or 4 simultaneous measurements 

� Secure data acquisition and data 

handling

Petfoods – its important our 

best friends eat well! 

Horticulture – 

seeds – preven - 

tion of germination 

during storage 

Pharmaceutical 

industry; tablet and 

powder ERH 

Building materials 

Water Activity Applications 

Tobacco industry 

Bakery products 

Food industry – cheese 

Food 

industry – 

meat products 

Paper manufactur ing, 

converting, storing 

and printing 

W 

A 

T 

E 

R 

A 

C 

T 

I 

V 

I 

T 

Y 

77

W 

A 

T 

E 

R 

A 

C 

T 

I 

V 

I 

T 

Y 

78 

Introducing Water Activity Products 

The ROTRONIC range of water activity instruments uses the latest digital technology to introduce new levels 

of measurement performance, application fl exibility and new features. Multiple probe inputs, PC based data 

handling, instrument networking, software based calibration, and interchangeable measurement stations 

are just some of the features included in our latest range. 

The humidity sensors used in our measurement probes have an enviable reputation for precision and reliability. 

Their performance is now augmented by software based analysis modes and new developments in 

mechanical probe design. These combine to achieve consistently high levels of performance with signifi - 

cantly reduced sampling times, and extremely cost effective pricing. 

Our range of water activity measurement stations and probes feature the HygroClip digital signal processing 

technology, including signal transmission and calibration. This produces a signifi cant gain in accuracy, 

data integrity and stability, as well as convenient features such as simplifi ed PC based confi guration, data 

acquisition and calibration using easy-to-use Windows software. 

Bench top display instrumentation is also now complemented by a handheld portable solution; using the 

same high precision measurement technology to ensure consistently precise results and full interchangeability 

between laboratory and production data. 

HygroLab 

HygroLab is a range of three high quality benchtop display instruments 

for the laboratory environment. HygroLab 1 is a cost effective 

2 channel instrument with measurements displayed in %rh and °C 

units. HygroLab 2 has 4 probe inputs plus the option to display measurements 

in aw units, and an RS232 interface for display, data acquisition 

or confi guration. 

HygroLab 3 is the fl agship of our range, with all the features of the 

HygroLab 2, plus the addition of HygroData Quick which has specialised 

features specifi c to water activity analysis including rapid equilibrium 

in typically 5 minutes or less, plus automatic capture of fi nal 

values. 

HygroPalm AW1 

In some instances, the ability to measure water activity in production 

or storage environments can be very useful. For example, when bulk 

deliveries are received, they can be checked on receipt to make sure 

that supply specifi cations are met. 

The new HygroPalm AW has been specially confi gured to offer the key 

functions of the HygroLab 3, including HygroData Quick in a portable 

package 

Aw Quick 

Aw Quick is advanced software for water activity analysis which is 

either integrated within the HygroLab 3 or HygroPalm AW display instruments, 

or can be run on a PC connected to a HygroLab. 

Aw Quick provides the user with fi nal measurement results in typically 

fi ve minutes or less, or can run a conventional water activity analysis 

with automatic detection and capture of equilibrium values.

LC Display: 

Includes probe input indicator, 

three line numeric display 

MENU: 

Press this key to activate 

the functions menu 

Up to 32 HygroLab 2 + 3 

instruments can be 

networked together. 

128 measurement probes 

controlled by one PC! 

HygroLab Feature Overview 

UP/DOWN: 

Changes displayed probe and 

navigates. 

Multiple inputs: 

4 probes simultaneously 

ENTER: 

Confi rms selection 

ON / Off 

W 

A 

T 

E 

R 

A 

C 

T 

I 

V 

I 

T 

Y 

79

W 

A 

T 

E 

R 

A 

C 

T 

I 

V 

I 

T 

Y 

80 

HygroLab 

HygroLab 1: 

Basic two-probe bench top indicator of %rh & °C. 

Key features: 

• Accepts 2 ROTRONIC digital or analogue probes 

• Display of %relative humidity and temperature 

• Software-based probe calibration (1-point or multi-point) 

Order code: 

HygroLab 1 

HygroLab 2: 

Bench-top display instrument with four probe inputs, display in 

Aw units, %hr and °C. 

Key features: 


• Full psychrometric calculations 

• Software-based probe calibration (1-point or multi-point) 

• Can use one of the four probes as a reference to perform a 

1-point adjustment of the other probes 

• RS232 interface for PC running HW3 software 

• RS485 interface for networking instruments together 

• Optional analogue outputs 

• Optional: Accelerated water activity measurement with up to 

4 probes: (AwQuick mode): allows the measurement of most 

products in typically 5 minutes; requires HW3 software 

Order code: 

HygroLab 2 

HygroDATA Lab Software HW3 and RS cable 

HygroData Quick: HygroQuick function 

HygroLab 3 

Water activity analyser with four probe inputs and integrated AW 

Quick. 

Key features: 

• Accelerated water activity measurement with up to 4 probes: 

(AwQuick mode): allows the measurement of most products in typically 

5 minutes 

• Full equilibration measurement with up to 4 probes (Standard 

mode) with automatic detection of equilibrium conditions 


• Full psychrometric calculations 

• Software-based probe calibration (single-point or multi-point) 

• Can use one of the four probes as a reference to make a 1-point adjustment 

of the other probes 

• RS232 interface for PC running HW3 software 

• RS485 interface for networking instruments together 

Order code: 

HygroLab 3 

HW3 Software 

The HW3 software package has a comprehensive range of functions 

which are compatible with the HygroLab. 

Order code: 

HygroDATA Lab Software HW3 and RS cable 

See chapter HW3 Software for full information.

HygroPalm AW1 

The HygroPalm AW1 is a portable instrument specifi cally confi gured 

for the measurement of water activity. It includes many of the advanced 

features of the HygroLab, including the Aw Quick mode for 

results in 4–6minutes. This makes it perfectly suited for users who 

wish to perform water activity analysis in production, goods receiving 

or storage areas where portable instrumentation is more convenient. 

Key features: 

• Accelerated water activity measurement: 

(AwQuick mode): allows the measurement of most products in typically 

5 minutes 

• Full equilibration measurement (Standard mode) with automatic 

detection of equilibrium conditions 

• Single digital probe input 

• Single or multiple point digital calibration directly with the keypad 

• Aw display units 

• Available as a set with carry case 

• Optional docking station for battery charging or mains operation 

Order code: 

HygroPalm AW1 

PD1 Docking Station for AW1 with connector 

for AC1207 power adaptor 

AC1207 Power adaptor 

HygroPalm AW Sets 

For on-site measurements, or for the fi rst time user, the HygroPalm 

Aw sets are a perfect solution. The sets are supplied in a lightweight 

but tough ABS carry case, and include all the items required to perform 

measurements and maintain the instrument. 

HygroPalm AW 

The difference between the two sets is the size of the sample holder 

and sample containers. AW1-Set/14 includes the WP14/PS14 for sample 

sizes such as tablets, powders, seeds, powdered spices, tea etc. 

AW1-Set/40 includes the WP40/PS40 for larger samples such as petfood, 

ore, nuts, beans, etc. (see also “Accessories & Consumables” for 

more information) 

HygroPalm HygroPalm 

AW1-Set/14 AW1-Set/40 Description 

HygroPalm AW1 HygroPalm AW1 Handheld display instrument 

AW-DIO AW-DIO Measurement probe 

WP-14-S WP-40 Sample holder 

PS-14 PS-40 13/6 sample container 

EA35-SCS EA35-SCS 35 %rh calibration standards 




AC1119 AC1119 Case 

W 

A 

T 

E 

R 

A 

C 

T 

I 

V 

I 

T 

Y 

81

W 

A 

T 

E 

R 

A 

C 

T 

I 

V 

I 

T 

Y 

82 

Water Activity Probes 

Based on HygroClip digital electronics technology for high perfor mance and convenient digital calibration, 

our selection of probes will suit almost any application. All water activity stations and probes incorporate 

temperature measurement as standard. 

AW-DIO Water Activity Station 

The AW-DIO is a water activity measurement station which measures 

over the range 0…1 aw (0…100 %rh) and provides a digital output 

signal to interface with HygroLab and HygroPalm Aw display units. 

Digital calibration can be performed using the display instrument. 

Minimised internal volume of the sensor chamber ensures fast equilibrium 

with all products, and an all metal construction ensures good 

temperature stability during measurements, with stainless steel used 

on all critical surfaces. Sample holders, sample containers and a sealing 

mechanism are detailed in accessories. 

AW-DIO is now the single option for water activity measurements in 

a sample chamber. It replaces previous products such as the WA-14, 

WA40, AS-ST, and WAO. It also has superseded the AWVC model 

with integrated air circulation fan. Through our continuous research 

and development program we have been able to match or better the 

equilibrium performance of the ventilated system with our new Aw 

specifi c sensor, and improved mechanical design. 

Measuring range: 0...100 %rh (0...1 aw), 5...50°C 

Order code: 

AW-DIO 

Dimensions of AW-DIO probe 

Temperature Control 

Stable temperature during measurements can be very important with 

some products in order to obtain precise results. Our measurement 

probes are designed with a high thermal mass to prevent variations 

during measurement, but for the highest precision or where laboratory 

temperature changes, temperature control solutions are avail able. 

Please contact ROTRONIC or your local distributor for more information.

HygroClip SP05 Insertion Probe 

For direct measurement of water activity in bulk samples. Applications 

include tablets, gel capsules, grain and plastic granules. HygroClip 

SP05 features a precisely engineered 5 mm-diameter stainless steel 

probe with laser cut slots to allow the humidity measurement sensor 

exposure to water vapour in the air (not suitable for powders or dusty 

products). 

Measuring range: 0...100 %rh (0...1aw), -40...85°C 

Order code: 

HygroClip SP05 5 mm insertion probe 

MOK-02-B5 Cable, HygroClip SP05 to 

HygroLab/HygroPalm Aw1 


HygroClip HP28 Insertion Probe 

For direct measurement of water activity in bulk samples. 

Applications include powders, granules, grain and cereals. HygroClip 

HP28 features a robust 10 mm-diameter stainless steel probe with replaceable 

sintered steel dust fi lter to allow the humidity measurement 

sensor exposure to water vapour in the air or product. 


Order code: 

HygroClip HP28 10 mm insertion probe 




HygroClip SC04 /SC05 

Suitable for air measurement in small spaces thanks to the 5 mm probe 

diameter and compact dimensions. For customers measuring water 

activity, the HygroClip SC05 is useful for the measurement of humidity 

and temperature in packaging, storage containers and incubators. 


Order code: 

HygroClip SC04 4 mm cable mounted probe 

HygroClip SC05 5 mm cable mounted probe 



Ø: 5 mm Cable: 2 m 

Water Activity Probes 

W 

A 

T 

E 

R 

A 

C 

T 

I 

V 

I 

T 

Y 

83

W 

A 

T 

E 

R 

A 

C 

T 

I 

V 

I 

T 

Y 

84 

Accessories and Consumables 

Sample Holders 

Stainless steel sample holders that are precisely engineered to work 

with the AWC/VC water activity chamber. Two sizes are available, 

WP14-S is for small product samples (14mm depth) and WP40 for 

larger materials (40mm depth). Both products provide excellent sample 

containment and optimum temperature stability. WP-40TH has an 

integrated water jacket for temperature control. Recommended temperature 

control level max. ±5°C from ambient temperature. 

Order code: 

WP-14-S for PS14 

WP-40 for PS14 and PS40 

WP-40TH with water jacket for temperature control 

Sample Containers 

Disposable sample containers that ensure the optimum sample volume 

is introduced into the WP-14-S and WP-40. They help to prevent 

the sample holders from coming into direct contact with product being 

tested, and hence prevent soiling or cross contamination. The 

sample containers also provide a convenient means of collecting and 

storing samples. 

Order code: 

PS14 Pack 100 sample containers to suit WP-14-S 

PS40 Pack 100 sample containers to suit WP-40 

Clamp Sealing Mechanism 

In some circumstances additional mechanical sealing of the AW measurement 

station and sample holder is required to prevent external 

conditions infl uencing the sample. The AW-KHS provides a strong 

mechanical seal, and is compatible with all available sample holders. 

(Only in combination with WP-40 and WP-40TH) 

Order code: 

AW-KHS 

Humidity Standards 

The ROTRONIC SCS certifi ed humidity standards provide a reference 

value against which instruments can be calibrated. They are supplied 

in packs of 5, complete with certifi cates of calibration. They can be applied 

to all probe types, with Water Activity probes using sample holders 

and containers, for other probes (HygroClip SP05, SC04 and HP28) 

a calibration device is required. 

Order code: 

EA-xx-SCS Where xx = 00, 05, 10, 11, 20, 35, 50, 65, 75,80 & 95%rh 

Calibration Devices 

Provide a sealed environment around probes where ROTRONIC humidity 

standards can be applied. 

Order code: 

ER-05 for 5 mm diameter probes (HygroClip-SP05 / SC05) 

ER-15 for 15 mm diameter probes (HygroClip S) 

EGL for 10 mm diameter probes (HygroClip HP28) 

Aw-DIO can be calibrated in combination with the sample holder and 

container (WP-14/PS14).

What is Water Activity? 

Water Activity Explained 

Water Activity (aw) is the relative humidity which is reached at equilibrium in a sealed container in which 

a hygroscopic product has been placed, but expressed on a scale of 0…1. Water Activity measurement is 

most commonly used in the food industry, where it is used to determine shelf life and quality. 

What is Equilibrium Relative Humidity? 

Equilibrium Relative Humidity (ERH) is the value of relative humidity into which a Hygroscopic product can 

be placed where no net exchange of moisture between the product and the surrounding environment can 

take place. It is expressed on a scale of 0…100%. ERH is typically used in the paper and pharmaceutical 

industries, but can be applied to almost any product that is sensitive to moisture, or where the presence of 

moisture can effect product handling. 

Aw or ERH? 

Both aw and ERH are an expression of the amount of free water vapour present on a product, both at its 

surface and within its structure, and are practically the same measurement expressed in a slightly different 

way. Throughout this data sheet we will refer to Water Activity, but this can be interchanged with ERH. 

Where specifi ed, ROTRONIC products offer the user the possibility to select display units of aw or %rh. 

What is Moisture Content? 

Moisture content, when referring to a solid material, is an expression of the percentage of the materials 

weight which is water (both in liquid or gaseous phase); usually referred to as ‘percent moisture content’. 

This term is widely used in many areas of industry. 

Water Activity or Moisture Content? 

There is frequently confusion between Water Activity and moisture content measurements. In many industries, 

moisture content is used to control the amount of water present in a product for quantitative reasons. 

For example, if a product is sold by weight, controlling its moisture content may be useful in maintaining 

product quality, but can also impact on profi tability (more water equals more profi t). 

Water activity is more signifi cant for qualitative considerations such as product stability shelf life (e.g. 

microbiological & enzymatic stability, aroma retention), handling characteristics (e.g. agglomeration of 

powders), physical properties (e.g. dimensions of paper) and chemical stability (e.g. pharmaceuticals). 

Sorption Isotherm 

Water Activity and Moisture Content can be related by a graph 

called a Sorption Isotherm (see diagram) so if the user has the ability 

to measure both parameters, the relationship can be defi ned 

and each parameter derived from the other (interpolation). 

In practice, the Sorption Isotherm may be impractical to use, because, 

not only does the relationship between aw and moisture 

content change with temperature of measurement, but also any 

variation in the material composition has a modifying effect. This 

is especially the case with products of natural origin such as food 

and paper. The user should therefore decide which parameter of 

measurement is best suited to their product and processes. For 

quality control purposes moisture content limits are easily converted 

to Water Activity limits by very simple comparative tests. 

Water Activity offers a non-destructive, easy to use measurement 

in a wide range of convenient confi gurations for both laboratory 

and on-site use. 

W 

A 

T 

E 

R 

A 

C 

T 

I 

V 

I 

T 

Y 

85

W 

A 

T 

E 

R 

A 

C 

T 

I 

V 

I 

T 

Y 

86 

Adr. 0 Adr. 1 Adr. 2 Adr. 31 

WP-14-S WP-40 

WP-40TH 

Schematics and Diagrams 

Networking (HygroLab 2 and 3) 

The optional HW3 software offers a simple means of quickly establishing a PC based network. Up to 32 

HygroLab indicators and/or HygroFlex transmitters can be connected together on a network. Any instrument 

can be used either as a slave or a master, without special confi guration. Each unit must be given a 

unique network address with the HW3 software (0 to 31). The master is automatically the unit that is connected 

to the COM port of the PC by means of the RS232 port. See Connectors – RS232 / RS485 for details. 

RS232 (3 wires) 

max. 12 m 

Dimensional diagrams 

RS485 (2 wires) 

max. 1000 m 

~160 

AW-KHS 

~220 

200 x 120

Technical Data 

Key Features HygroLab 1 HygroLab 2 HygroLab 3 HygroPalm Aw 1 

Probe Connections 2 4 4 1 

PC Interface No RS232/485 RS232/485 No 

Networking No Up to 32 instruments using RS485 No 

Aw Quick mode No With HygroData Integrated & with Integrated 

Quick (Software HygroData-LAB 

and PC) (HW3 Software 

and conn. cable) 

Calibration functions 1 point Using keypad Using keypad Using keypad 

with keypad or PC; 1 or or PC; 1 or 1 point %rh (aw), °C/F, 

4 point %rh (aw), 4 point %rh (aw), 4 point %rh, 

2 point °C/h 2 point °C/F 2 point °C/F 

Display units %rh, °C, °F, %rh, aw, °C, °F, calculated parameters aw, °C, °F, 

Calculated parameters None Dew-point, wet-bulb, None 

enthalpy, mixing ratio, 

moisture content, 

partial water vapour pressure, 

saturation water vapour pressure 

Audible signal 

upon measurement end: No No Yes No 

Accuracy at 23°C ±1.5 %rh, ±0.3 K ±1.5 %rh, ±0.015 aw, ±0.3 K 

Repeatability Better than 0.5 %rh Better than 0.5 %rh/0.005 aw, 0.1°C/0.2°F 

0.1°C/0.2°F 

Sensors Probe dependent 

Instrument 

operating range 0…99 %rh, -10…60°C (14…140°F) 

Display Type Liquid Crystal 3 line alphanumeric 

Trend indicator No Yes Yes Yes 

Display resolution 0.1 %rh/0.1°C/F 0.1 %rh, 0.001 aw, 0.1°C/F, 0.01 calculated value 

Housing Aluminium, 220 x 170 x 55 mm ABS 

Power 9 V Power adapter, +tip PP3 battery, or 9 V 

power adapter +tip 

through PalmDock 

CE Conformity EMV: EN50081-2 EN/EN50082-2 

Note: 

Many older products have been replaced by new ones, that perform better. 

ROTRONIC will continue to support the old products as long as possible. 

Our customers are used to the fact, that we still maintain probes and instruments that are over 20 years old. 

We will continue this tradition for the benefi t of our customers who will thus always get the best price / performance 

ratio and have their investments secured. 

W 

A 

T 

E 

R 

A 

C 

T 

I 

V 

I 

T 

Y 

87

T 

E 

M 

P 

E 

R 

A 

T 

U 

R 

E 

88 

Temperature Measuring Instruments 

Temperature Measuring Instruments T1, T51, T55 

The measurement of temperature is essential in many production processes, storage, drying and transportation 

applications, and even at home for a comfortable climate. In many countries, the law demands that 

in the food- and pharmaceutical industry temperature is controlled and recorded. ROTRONIC offers handheld 

instruments and transmitters for this purpose, which are used in the pharmaceutical industry, as well 

as in dairy food chains, the transportation sector, warehouses etc. The easy handling and installation, and 

the wide measuring ranges make them suitable for most applications. The M-series and Roline-L-series 

transmitters are also available for temperature measurement only. 

Handheld measuring instrument T1 for Pt100 probes 


• Plug in Pt100 probes, see next page 

• Automatic range adjustment at 200°C 

• Large, 3 1 /2 digit LCD display 

• DATA HOLD 

• °C/°F selectable on PCB by jumper 

• Adjustable 

Order code: 

T1 

Handheld measuring instrument T51 

• Interchangeable thermocouple type K, see page 90 

• Max. display 

• DATA HOLD 

• Impact protection 

• Includes one wire probe 

• °C/°F switch selectable 

Order code: 

T51 

Handheld measuring instrument T55 

• 2 interchangeable thermocouples type K or J, see page 90 

• Min/max display 

• DATA HOLD 

• Temperature difference T1-T2 

• Stopwatch function 

• Impact protection 

• Includes two wire probes 

• °C/°F switch selectable 

Order code: 

T55 

TI Transmitter for Pt100 probes 

• Transmitter for the most demanding industrial processes 

• IP65 housing 

• Linear output signals 

• Probe connector on housing 

• Connectable Pt100 probes, see next page 

• Optional digital display 

Order code: 

see table on page 91

Temperature Measuring Probes Pt100 Probes 

Order code Probe type Specifi cation Material Cable All Probes with Binder 4 pin plugs 

AC 1900 Rod Type, -70...300°C DIN 1.4401 N/A 

100 x 3 mm Pt 100 Class A 

AC 1901 Rod Type -70...500°C DIN 1.4401 N/A 

250 x 3 mm Pt 100 Class A 

AC 1902 Penetration Type -70...500°C DIN 1.4401 1m 

250 x 3 mm Pt 100 Class A PUR 

Tmax Cable: spiral 

80°C 

AC 1903 Cable Type -70...500°C DIN 1.4401 2m 

200 x 6 mm Pt 100 Class A Silicon 

Tmax Cable: straight 

180 °C 

AC 1904 Cable Type -50...120°C DIN 1.4401 2m, 

50 x 6 mm Pt 100 Class A Thermoplast 


120°C 

AC 1905 Surface Type -70...300°C Brass 2m 

40 x 10 x 5 mm Pt 100 Class A Silicon 


180°C 

AC 1907 Surface Type, 0...200°C DIN 1.4401 1m 

angle 90 °, Pt 100 Class B PUR 

250/60 x 5 mm Tmax Cable: spiral 

80°C 

AC 1908 Handheld, for -50...200°C DIN 1.4401 1m 

measurement in air Pt 100 Class A spiral 

250 x 5 mm Tmax Cable: 

80°C 

AC 1909 Rod, for -50...200°C DIN 1.4401 2m 

measurement in air Pt 100 Class A Silicon 

100 x 5 mm Tmax Cable: straight 

180°C 

AC1910 Screw in, -70...500°C DIN 1.4401 N/A 

1⁄4" G, 30 mm Pt 100 Class A 

Tmax Cable: 

180°C 

AC 1911 Screw in, -70...500°C DIN 1.4401 N/A 

1⁄4" G, 50 mm Pt 100 vA 

Tmax Cable: 

180°C 

AC 1912 Screw in, -70...500°C DIN 1.4401 N/A 

1⁄4" G, 100 mm Pt 100 Class A 

Tmax Cable: 

180°C 

AC 1913 Foil 0...200°C Silicon 1m 

25 x 32 x 1 mm Pt 100 Class A 

Pt100 Probes 

30 

ø4.5 

100 

40 

1/4"G 

10 

200x5 

ø5 

30 50 L 

1/4"G 

ø5 

30 50 L 

1/4"G 

ø5 

30 50 L 

25 

32 

5 

1 

60x5 

T 

E 

M 

P 

E 

R 

A 

T 

U 

R 

E 

89

T 

E 

M 

P 

E 

R 

A 

T 

U 

R 

E 

90 

Temperature Measuring Instruments 

Order Code Probe Type Specifi cation Useed for All Probes 

with K-type plug 

44.10.1885 TCP-A -50...800°C Measuring in the 

Penetration probe K-element, food industries in 

150 x 4 mm semi-compact material 

such as jelly etc. 

44.10.1890 TCP-B -50...800°C Measuring in liquids 

Immersion probe K-element and jellies etc. 

200 x 2 mm 

44.10.1486 RO40017 -50...480°C Multi purpose probe 

Universal probe K-element, 

28 x 57 mm 

44.10.1900 TCP-F -50...800°C Fast measuring 

Surface probe K-element on surfaces 

150 x 10 mm 

44.10.1475 S533 -50...250°C For measuring in air, 

wire probe K-element liquids etc. 

1000 x 1.3 mm 

Accessories 

AC 2001 Screw-in measuring-sleeve for 3 mm 

probes; Thread 1⁄4" G 

Immersion depth 50 mm 

AC 2002 Screw-in measuring-sleeve for 3 mm 

probes; Thread 1⁄4" G 

Immersion depth 100 mm 

HygroClip TH100-B5 Adaptor for all Pt100 probes 

for HygroPalm 2/3 & HygroLab instruments 

with Binder 5-pin plug

Order Code TI Temperature Transmitters 

Temperature Transmitters 

Order code 1 2 3 4 5 6 7 8 9 10 11 12 13 14 

Example: TI1 - 2 - B 4 - 4 A 1 X - 1 4 

Transmitter Series TI1 - 

Power supply: 230 VAC 0 

115 VAC 1 

4…20mA loop power (Umin =10 V+0.02 x load) 2 

24 VAC galvanically separated 3 

10(15)…35 VDC/12…24 VAC 8 

PT100 connector Binder 4-pin B 4 

Output signal 0…20 mA 0 A 

4…20 mA 4 A 

0…1 V 1 V 

0…5 V 5 V 

0…10 V 0 V 

Cable connection 1 M16 Terminals 1 

2 M12 Terminals 2 

Tuchel plug 7-pin 7 

Display None X 

With Display D 

Temperature Range = 0…50°C 1 0 

Output signal -30…70°C 1 1 

0…100°C 1 4 

-40…60°C 1 9 

0…200°C 2 0 

-50…150°C 2 1 

-100…100°C 2 2 

-100…200°C 2 3 

-100…300°C 2 4 

Technical Data Temperature Measuring Instruments 

Series T1 T51 T55 TI-Series 

Instrument type Handheld Transmitter 

IP Protection rating IP50 IP-50, rubber impact protection IP65 

Power supply AC/DC/mains 

9 V PP3 alkaline battery Yes No 

10…35 VDC/24 VAC N/A Option 

115 /230 V AC N/A Option 

Galvanic separation N/A Option 

4…20 mA loop power 

(Umin =10 V+0.02 x load) N/A Option 

Number of Probe inputs 1 1 2 1 

Connection type of probe 3-wire 2-wire 3-wire 

Operating range electronics 0…50°C / 0…90%rh -20…50°C 

Measuring range withPt100 -100…500°C N/A N/A 

with K-Type N/A -50…1300°C -200…1370 °C Probe dependent 

with J-Type N/A N/A -200…760 °C 

Accuracy at 23°C Pt100 ±0.1 K ±0.3 K 

1000°C N/A ±0.5% +1 K ±0.3% +1 K N/A 

Reproducibility 0.1 K 

Display 31⁄2 Digits 4 Digits Option, not for 

loop power 

Auto Power Off Yes No N/A 

Low Battery Indicator Yes N/A 

Hold Function Yes N/A 

Tmax. recording No Yes N/A 

Differential Temp. No Yes N/A 

Stop Watch No Yes N/A 

T 

E 

M 

P 

E 

R 

A 

T 

U 

R 

E 

91

O 

E 

M 

P 

R 

O 

D 

U 

C 

T 

S 

92 

OEM 

Original Equipment Manufacturers (OEM’s) require individual solutions to suit the needs of their customers. 

ROTRONIC have been producing customised humidity measurement products to suit the OEM for 

many years, and have a wide breadth of experience in satisfying this specialist need. 

Today, our OEM capability is greater than ever, from the simplest sensor 

supply, right through to complex transmitters for the industrial 

process market. One thing is clear, the demands of the customer and 

the end use are rarely the same, so the need for a professional and 

fl exible supplier is key. 

As each project is different, our experienced sales team will discuss 

project objectives, technical requirements and target costs at a preliminary 

meeting. We will then formulate an initial proposal based on 

this discussion and submit this to the customer. 

After agreeing a fi nal specifi cation, samples can then be submitted for 

technical approval and testing. During this phase, ROTRONIC are able 

to participate in the customer assessment of product suitability, and if 

required, provide secondary testing of the completed assembly in our 

own accredited test facilities. We are also able to advise on the fi nal 

assembly and calibration process. 

Wherever possible, we will utilise existing products or sub assemblies 

in the creation of an OEM solution. This can provide signifi cant advantages 

in design and development costs, as well as reducing the start 

up times. 

ROTRONIC OEM Product Capability 

• %rh sensors 

• Calibrated sensor modules 

• Transmitter or probe sub assemblies 

• Standard ROTRONIC products with customers own branding 

ROTRONIC OEM Support Capability 

• Custom design 

• Custom packaging 

• Labelling and barcodes 

• Documentation, including manuals 

• CAD drawings for manufacturing records 

• Calibration materials and systems 

• Training of customers technical and sales staff

%rh Sensors 

OEM 

In many high volume applications, the supply of only the %rh sensor 

is a cost effective option. In these circumstances the OEM should carefully 

consider the process of calibrating the fi nal measurement circuit 

to obtain the required performance. When calculating the actual cost 

of the implementation of humidity measurement, the sensor cost 

must include provision of the calibration process, circuit design and 

fi nal assembly. In many cases, the specifi cation of a pre-calibrated 

measurement module can be equally cost effective, and can reduce 

the ongoing costs of production. 

ROTRONIC can supply a range of %rh sensors based on capacitive or 

resistive technologies. Various standard products are available with 

pre-defi ned specifi cations, dimensions and characteristics. We are 

also able to offer customised sensor production to suit specifi c project 

requirements. 

Calibrated %rh Sensor modules 

The advantage of implementing a pre-calibrated sensor module is that 

the OEM does not have to develop a measurement circuit or an inhouse 

calibration system. 

The appropriate product can be specifi ed to be compatible with existing 

interface and power supply requirements, and with simple connection 

to the fi nal application prior to delivery. The whole specifi cation, 

design and supply of the humidity measurement element of the OEM 

need can be handled by ROTRONIC, leaving the customer to focus on 

their core product development and support. 

ROTRONIC in house calibration procedures have been developed over 

many years, and proven in many thousands of instances. The end result 

for the OEM customer is a well developed production process that 

assures best possible measurement performance with zero investment. 

%rh Transmitter or Probe Sub Assemblies 

For OEM customers who offer their own branded range of %rh sensors, 

for end uses such as HVAC/BMS, process control or data-acquisition, 

ROTRONIC can supply a completed and calibrated product to fi t 

the customers own housings. 

In these circumstances, the customer has two main advantages. The 

responsibility for product design, assembly and calibration is handled 

by ROTRONIC, which minimises production costs and component 

stock risk. The customer also benefi ts from an ‘own brand’ product 

which has the very best performance capability, and has access to 

ongoing development to keep the product at the leading edge of the 

humidity market. 

Standard products with customers own branding 

Throughout the pages of this catalogue you will fi nd a range of humidity 

measurement products that are market leading in terms of performance, 

features and price. ROTRONIC are happy to effect a simple 

‘re-brand’ of the standard product range so that the OEM can offer a 

class leading product with no development cost and minimal stock 

risk. 

Ancillary products such as calibration materials, replacement fi lter 

elements and software are of course already available. Support documentation 

such as manuals, software validation, type approvals and 

drawings can be easily re-branded on behalf of the OEM customer. 

O 

E 

M 

P 

R 

O 

D 

U 

C 

T 

S 

93

O 

E 

M 

P 

R 

O 

D 

U 

C 

T 

S 

94 

Example OEM Products 

The products described are standard OEM products which are mass produced for many existing cus tomers. 

They are available on very short delivery times, often from stock, and require no further development 

or documentation. Full technical datasheets are available in standard formats and show full technical 

and mechanical specifi cations. The range of products shown is by no means defi nitive, we could fi ll the 

whole of this catalogue with the OEM products in current production at ROTRONIC, so please contact us 

if the product you need is not shown. 

Technical Data: 

CS %rh sensor 

The CS %rh sensor is a substrate based capacitive %rh sensor. It is 

designed specifi cally for applications where high quality is as important 

as cost. Three standard versions are available to suit most applications. 

Features overview: 

• Wide range of operating temperatures 

• Chemically resistant 

• Long term stable 

• Fast response times 

• Low hysteresis 

• Heated version for high humidity applications (CS70) 

• Compact dimension and high sensitivity(CS10) 

• Fast response & solvent resistant (CS30) 

CS10 CS30 CS70 

Humidity measuring range 0...100 %rh 0...100 %rh 0...100 %rh 

Temperature operating range -30...150°C -40...190°C -10...50°C 

Typical capacitance at 30 %rh and 23°C 140 pF ±40 pF 300 pF ±40 pF 250 pF ±50 pF 

Typical sensitivity (15 ... 95 %rh) 0.4 pF / %rh 0.45 pF / %rh 0.45 pF / %rh 

Linearity at 23°C ± 1.5 %rh ±2.0 %rh ±2.0%rh 

(20...90%rh) (20...95 %rh (20…95 %rh) 

Hysteresis < 1.5 %rh < 2.0 %rh < 2.0 %rh 

Response Time t90

HygroClip 

Example OEM Products 

The HygroClip-S is a standard humidity and temperature sensor module 

which is widely used throughout the ROTRONIC product range 

on end-user products such as handheld instruments, data loggers and 

transmitters. It is already in widespread use by third party OEM instrument 

manufacturers thanks to its excellent performance and price. 

HygroClip is available as standard in a wide range of confi gurations 

to suit almost any end use, and in addition, can be customised to 

suit speci fi c OEM needs. Variations in mechanical packaging, colour, 

connectors and cable lengths can all be incorporated into a unique 

design. 

Further information and full technical specifi cations can be found 

on page 62 to 67. 

Transmitter sub assembly 

H290 is an OEM humidity and temperature product with an impressive 

specifi cation. It is particularly well suited to applications such as climatic 

chambers and drying systems. It is available either as a pcb and 

probe combination for fi tting into the customers own enclosures or 

housings, and can also be supplied in an industry standard IP65 case. 

H290 provides a liners analogue output of 4…20 mA or 0…10 V from 

a power supply of 10…35 VDC or 12…24 VAC. Temperature measurement 

is by direct connection to a Pt100 or Thermistor, depending on 

the customers requirements. 

Also featured on the H290 is a compensation system for operation 

over a wide –50…200°C range, with integrated cable length compensation. 

This means that whatever the measurement temperature, or 

the differential in temperature between sensors and electronics, optimum 

results will be obtained. 

THT Series 

A range of humidity transmitters with excellent stability and very cost 

effective pricing. The THT series offers a range of analogue outputs 

such as 4…20mA and 0…10 Volt, for both humidity and temperature. 

There is also as the option to connect directly to a temperature sensor 

such Pt100 or Thermistor. 

THT is highly suitable for close control applications such as air conditioning 

or building monitoring where steady state conditions are 

usual. 

Roline L 

Our standard low cost transmitter is particularly well suited to OEM 

application thanks to its excellent combination of performance and 

price. It has a wide choice of measurement ranges and output signals, 

and its compact printed circuit board dimensions means that it can be 

easily integrated or reconfi gured into existing housings. 

See pages 53 to 55 for further details. 

For full technical specifi cations, dimensions, and specifi c product features, please request 

the individual datasheets. 

O 

E 

M 

P 

R 

O 

D 

U 

C 

T 

S 

95

C 

A 

L 

I 

B 

R 

A 

T 

I 

O 

N 

96 

Calibration 

ROTRONIC instruments have excellent long-term stability characteristics, with better than ±1%rh stability 

over a year in normal conditions, but we still recommend that regular calibration checks are performed 

(once per year typically). Normal conditions can be defi ned when high temperature or humidity, or MAC 

(Maximum Allowable Concentration) levels of chemical pollutants are not typical. Many company operating 

procedures call for calibrations more frequently, depending on internal quality assurance systems. 

Why is calibration essential? 

Today, many companies are working under to ISOO9000 standards and are therefore obliged to calibrate their 

measuring equipment on a regular basis. Organisations such as the FDA (The Food and Drug Administration 

in the USA) also demand that the devices are calibrated and traceable to national standards. Last but not 

least, the quality standards defi ned by each company ask for best possible accuracy and proof of traceability. 

Hence, it is in the interest of the user, to have equipment calibrated and adjusted in order to maintain optimum 

performance. 

We offer calibration devices and accessories for all probes manufactured by ourselves, and also for products 

produced by other manufacturers. Please contact us for guidance on the most appropriate calibration device 

and standards. 

Key features 

• Non-saturated salt solutions 

• Sealed glass ampoules 

• Ready-to-use solutions 

• SCS-certifi ed 

• Specifi c calibration devices 


Section contains Page 

Humidity Standards 97 

� Certifi ed and traceable 

� Long shelf life 

� Precise and easy to handle 

� Ready for use – no solution-preparation 

Calibration devices 98 

� Easy to use 

� Robust 

� Optimised chamber volume 

Calibration with PC 99 

� HygroLab calibration 

� HygroFlex calibration 

� Simple handling, low temperature dependence 

� Long shelf life – 10 years guaranteed 

� No mistakes during preparation 

� Traceable to national standards 

� Optimum volume for each probe 

Rotronic and some Rotronic distributors or subsidiaries offer calibration 

seminars for their customers. 

Ask your distributor or Rotronic subsidiary for further information.

SCS* humidity standards 

The humidity standards from ROTRONIC are delivered in boxes of 

5 sealed ampoules of the same humidity value. Each ampoule is 

marked with the %rh value and a serial number. 

SCS* certifi ed humidity standards 

Order code: Humdity value 

EA00-SCS 0.5%rh 




EA20 SCS 20.0%rh 







Uncertainty of Rotronic 

SCS* Humidity Standards 

Humidity in %rh Measurement uncertainty at 23 ±2°C 

5 ± 0.1 %rh 

10 ± 0.3 %rh 

11.3 ± 0.3 %rh 

20 ± 0.3 %rh 

35 ± 0.5 %rh 

50 ± 0.9 %rh 

65 ± 0.9 %rh 

75.3 ± 0.9 %rh 

80 ± 1.2 %rh 

95 ± 1.2 %rh 

* SCS: Swiss Calibration Services 

Humidity standards 

The most frequently used values are 35 and 80%rh, which are used to 

perform a 2-point calibration. All ampoules contain a non-saturated 

salt solution, apart from the 0% standard, which uses a highly porous 

ceramic material (molecular sieve). An SCS certifi cate stating the 

traceability and uncertainty of the humidity standard is enclosed with 

every pack. 

Instruments produced by other manufacturers may require different 

values for adjustment. ROTRONIC offer a complete range of %rh values 

to suit most requirements. 

C 

A 

L 

I 

B 

R 

A 

T 

I 

O 

N 

97

C 

A 

L 

I 

B 

R 

A 

T 

I 

O 

N 

98 

EM-15/25 

EMV-15/25 

EGL/ER-15 

ERV-15 EGS 

EDM-15/25 

Calibration devices 

Calibration Devices 

Calibration devices 

Order code: Suitable for Mounting / Orientation 

ER-05 probes with 4/5 mm ø push-on 

EGL probes with 10 mm ø (A1) push-on 

ER-15 probes with 15 mm ø push-on 

ER-18K probes with 18 mm ø push-on 

ER-20K probes with 20 mm ø push-on 

ERV-15 probes with 15 mm ø push-on / vertical 

EM-15 probes with 15 mm ø push-on 

EM-25 probes with 25 mm ø push-on 

EMV-25 probes with 25 mm ø push-on / vertical 

EMV-15 probes with 15 mm ø push-on / vertical 

EDM 15/25 2 probes, 15 & 25 mm ø screw-in 

EM-G screw-in probe type E, HP...E... screw-in 

EGS for all ROTRONIC sword probes push-on 

EAS for bell probe AS-ST 

EAWC for AWC-measuring station 

EBFC for web probe BFC 

ERA for bell probe for rolls 

WP-14 for probe AWD, AWVC, AW-DIO 

The ROTRONIC calibration devices are small, airtight chambers, that 

fi t exactly to the respective probes. The lower part is a screw-mount 

lid, into which the humidity standard is fi lled, together with a textile 

pad. After a period of stabilisation, typically 60 minutes at stable temperature, 

the required humidity value is attained. The instrument can 

now be calibrated against the humidity reference value. 

Calibration devices are available for the entire range of Rotronic 

products, and we can also supply calibration devices for third party 

probes. 

The inner volume of the calibration device should not be too large; it 

should not exceed 50 ml of free space when the probe is fi tted. When 

the volume is too large, the correct humidity may eventually not be 

generated and the calibration reference incorrect.

Calibration of HygroClip probes 

with HygroLab 2 & 3 

Calibration 

The digital HygroClip probes may easily be calibrated in quantities 

by using the bench-top instrument HygroLab2. Up to 4 probes can be 

connected simultaneously to a single HygroLab 2. When the software 

HW3 is used, as many as 32 HygroLabs can be networked together, 

thus offering the possibility of calibrating or adjusting 128 probes. For 

customers who must calibrate many probes, this is a solution that 

saves a lot of time. 

As the instruments, probes and humidity standards can be maintained 

in a single room, not only the acclimatisation time can be reduced but 

also the accuracy will be improved. 

The HygroLab may be connected to any digital HygroClip probe for 

calibration. 

Calibration with a PC and HW3 software 

Up to 64 probes connected to a HygroFlex network of max. 32 transmitters 

may be calibrated by a PC, with the HW3 software. 

The calibration devices can be mounted on all probes on the respective 

transmitters, and fi nally, the calibration or adjustment 

be made with a few mouse clicks. 

The system will also print calibration reports if required. 

Calibration by direct PC connection 

Using the MOK connection cable and HW3 software 

Order code: 

MOK-02-WIN Adapter cable 

HW3 Universal software 

C 

A 

L 

I 

B 

R 

A 

T 

I 

O 

N 

99

H 

W 

3 

S 

O 

F 

T 

W 

A 

R 

E 

100 

HW3 Core Features 

HW3 Software 

Thanks to advances in digital technology, most of the instruments 

now produced by ROTRONIC feature a bi-directional RS232 interface. 

This works with PCs to display measured data, download recorded 

measurements or confi gure the system. In the past, the user often 

had a to use separate software for each instrument, which meant 

they had to learn different programs to be able to operate, and make 

the best use of their instrument. Today, ROTRONIC provides a single 

software package, HW3, which is compatible with our entire range of 

products, so that the user has only one system to learn for every humidity 

measurement application. 

HW3 software is developed and maintained in house at ROTRONIC 

by a skilled team of software developers. They are also involved in 

the development of our instrumentation, so are familiar with entire 

systems operation fi rst hand. This ensures that we are able to offer 

immediate support for products in the fi eld, and make sure that when 

new features and software routines are introduced, they are always 

compatible with the instrumentation hardware that we supply, or have 

supplied in the past. 

As well as our in-house developers, ROTRONIC has a second excellent 

source of software developers – our customers. Over many years of 

supplying PC compatible instrumentation, we have received many 

customer requests for new features or improvements. The feedback 

we receive is always considered when we are developing improvements 

to our software, so that over many years, it has evolved into 

one of the most comprehensively featured and user friendly packages 

on the market today. 

The range of features within HW3 is extensive, and the confi guration of the instrument connected of course 

infl uences what is possible, so check the specifi cation of your instrument of choice to determine compatibility 

with the following features: 

• Display of measured values directly on your PC 

• Alarm setting and monitoring 

• Audible, visual, email or SMS alarm notifi cation 

• Display of recorded values from data loggers 

• Display of an entire network of connected instruments 

• Data acquisition of measured values from a network of connected instruments 

• Archiving of measurement data 

• Instrument confi guration 

• Instrument identifi cation 

• Instrument status 

• Probe recalibration 

• Production of calibration certifi cates 

• Calculation of different psychrometric parameters such as dewpoint, wet-bulb temperature, 

mixing ratio, etc. 

• Accelerated Water Activity analysis (HygroData Quick upgrade) 

• …and many more… 

HW3 Validation 

Many ROTRONIC customers have learnt to depend on the accuracy and reliability of our humidity and temperature 

measurement systems. The advent of PC compatible products for measurement display and storage, 

as well as instrument confi guration and maintenance, has opened new many application possibilities. 

In many high value and critical applications accurate measurement is only part of the story. Data integrity 

and security is today an essential requirement, and in many circumstances, software must be validated for 

the measurement data to be accepted. HW3 is regularly submitted for software validation, and certifi cates 

of compliance are available to our customers. Of particular importance is the FDA regulation 21 CFR Part 11, 

which HW3 meets (documentation available on request).

Connect handheld instruments 

for confi guration, 

calibration, display and 

record measured values. 

Monitoring and display of water 

activity measurements including 

accelerated analysis and automatic 

data capture. 

HW3 Feature Overview 

Connect transmitters for 

confi guration, calibration, 

measurement display and 

data acquisition. 

Display measured values from a 

network of 32 HygroFlex or HygroLab 

instruments. Up to 128 probes simultaneously. 

Validated software 

FDA 21 CFR Part 11 compliant. 

Program data loggers 

and download data. 

Setting and notifi cation of 

alarms, audible, visual, SMS 

or e-mail. 

Control the calibration and 

adjustment of digital probes, 

including production of 

calibration certifi cates. 

H 

W 

3 

S 

O 

F 

T 

W 

A 

R 

E 

101

H 

W 

3 

S 

O 

F 

T 

W 

A 

R 

E 

102 

HW3 Features 

Features in More Detail 

Instrument Display Form 

With HW3 running on a PC and a compatible instrument connected, the 

measured values with trend indicators are displayed live on the monitor, 

together with instrument identifi cation. From this view it is possible to 

activate data acquisition of the measured values directly to the PC’s hard 

drive. 

For handheld instruments this feature is useful for logging local conditions 

to the PC, or if a cable mounted probe is fi tted, conditions inside a climatic 

test chamber or incubator. 

Transmitters are displayed in the same way, and when a multi point transmitter 

network is used, 32 instruments, each with up to 2 probes can be 

monitored simultaneously. 

If alarms are programmed, visual indication on this display form can be 

supplemented with audible signals and user notifi cation via email or SMS 

messages. 

HW3 Vision Graphic Display Module 

HW3 Vision display module presents either logged data fi les or live 

measurements in a convenient graphical format (scrolling). From this 

screen graphs can be either directly printed, or copied and pasted into 

documents or reports. Usual data analysis tools such as zoom, ruler and 

gridlines are included. 

Various formatting options are available through on screen icons, these 

include changing the graph background, trace colour, legends, gridlines 

and axis. The base text used within the HW3 Vision graph display module 

can also be confi gured by the user to suit specifi c application or operational 

needs. 

Instrument Confi guration Form 

If the ROTRONIC instrument you purchase has an RS232 interface, the 

Instrument Confi guration Form provides you with the tools to fully confi - 

gure or reconfi gure directly from the PC. 

Using a system of confi guration upload and download means that settings 

can be stored on the PC for future use or reference. This also means that 

programming several instruments with the same confi guration can be less 

time consuming. 

Instruments settings that can be modifi ed through this option include; 

probe type, display settings, units of measurement (International variations 

all included), measuring ranges, psychrometric calculations, analogue 

output scaling and serial communications setting (data format, network 

address etc). 

Each instrument can also be digitally renamed by the user to enable identifi 

cation of use or location, and notes describing the instruments history 

can also be stored with the confi guration data on the PC’s hard drive. 

HygroData Quick 

All current versions of HW3 are shipped with advanced water activity analysis 

software integrated. To access this function requires an additional 

license; see ordering information. For a full description of this feature, 

please refer to the Water Activity section of this catalogue. 

SoftCal Probe Calibration 

One of the most important features of HW3 is the SoftCal utility that controls 

the calibration process of our digital probes, which of course do not feature 

traditional analogue potentiometers. Within SoftCal you can perform 

zero, slope and linearity adjustment for humidity, and zero and slope for 

temperature. It is also possible to make a single point adjustment against 

a defi ned reference.In all cases the user can choose defi ned ROTRONIC 

calibration values, or make their own selection. As a precaution against incorrect 

adjustments, SoftCal automatically rejects adjustments greater than 

5%rh, as this is likely to be an indication or incorrect calibration method, or 

a faulty instrument.

Psychrometric Calculations 

All ROTRONIC instruments measure percentage relative humidity 

(%rh) and temperature (°C/F). From the two values it is possible to calculate 

other psychrometric values such as dew-point, frost-point, wetbulb 

temperature, mixing ratio, absolute humidity, enthalpy, partial 

water vapour pressure, saturation vapour pressure and more. 

The calculation software in HW3 uses WMO* verifi ed formulae to 

make these calculations, and also provides the user with the option to 

input their own parameters (e.g. input mixing ratio & temperature to 

calculate %rh). Other advanced options such as dew/frost-differentiation, 

and pressure or altitude compensation are included. 

*World Meteorological Organisation 

Alarms 

Specifi cations and Hardware Requirements 

Processor Recommended Pentium 233 Mhz or better 

Operating System Microsoft Windows 95, 98, ME, NT, 2000 

Audio Sound card or integral speaker for playback of alarm .WAV fi les 

Network LAN or modem for email or SMS alarm feature 

Memory 64 Mb or better 

Disk space 20 Mb 

Monitor VGA/SVGA 

Resolution 800 600 or better, High Colour 16Bit or better (256 colour minimum) 

Connection RS232 (Com 1…4) 

Supply format CD (mini type suits all CD drives) 

Upgrades Available on-line to registered users 

Manual On CD HTML format 

HW3 Ordering Information 

HW3 Features and Ordering Information 

Our HygroPalm, HygroLab, HygroFlex and M Series instruments with 

RS232 interface can all provide a continuous stream of measurement 

data for display and data acquisition within HW3. It is also possible to 

defi ne 4 alarm limits (High and Low, humidity and temperature). 

When alarm conditions are reached, HW3 can inform the user with 

either audible (.WAV fi les) or visual indication. In addition, the software 

can be confi gured to send an email or SMS text message (requires 

LAN or Modem connection). 

HW3 is typically supplied as a HYGRODATA bundle with the serial RS232 cable to suit the different instruments, 

please consult the relevant section of this catalogue. The main options are detailed below: 

Order code Description RS232 Cable order code 

HW3 Software only supplied on CD ROM N/A 

HygroData HP HW3 software and connecting cable to suit HygroPalm 2 and 3 AC1622 

HygroData HL HW3 software and connecting cable to suit HygroLog AC1590 

HygroData Lab HW3 software and connecting cable to suit HygroLab 11.01.6218 

HygroData HTS HW3 software and connecting cable to suit HygroFlex 2 and 3 AC1627 

HygroData Quick Upgrade License to add AW Quick modes to HW3 N/A 

H 

W 

3 

S 

O 

F 

T 

W 

A 

R 

E 

103

T 

H 

E 

O 

R 

Y 

104 

Theory 

Humidity measurement in air 

Humidity in the form of water vapour is always present in the air. It is measured either as absolute or relative 

humidity. These two terms are defi ned as follows: 

Absolute humidity of a gas mixture 

The absolute humidity of a gas mixture is defi ned as the quantity of water vapour (kg) contained in each 

volume of the gas mixture. It is expressed in terms of kg water vapour per kg gas mixture. 

The water vapour present in the gas mixture generates a pressure, which is part of the total barometric 

gas pressure. The vapour pressure and the absolute humidity cannot exceed the saturation level at a given 

temperature. Above this level, water is separated out in liquid form. The maximum pressure is described as 

saturation pressure and is highly temperature-dependent. 

The absolute humidity of the air is of limited practical signifi cance, because one essential factor, the temperature, 

is not taken into account in the determination of absolute humidity. 

Relative humidity of a gas mixture 

Relative humidity is defi ned as the ratio of the actual water vapour pressure to the highest possible water 

vapour pressure: 

%rh = 100 x p/ps 

p = Water vapour pressure in the 

gas mixture at ambient temperature 

ps = Saturated water vapour pressure 

at ambient temperature 

Therefore, 100%rh corresponds to the maximum amount of water vapour, which a gas mixture can contain. 

Below the saturation level, the water vapour pressure p and hence also the relative humidity (%rh) are proportional 

to the total barometric pressure. Since the highest possible water vapour pressure ps is extremely 

temperature-dependent, the relative humidity is also temperature-dependent. The relative humidity therefore 

decreases, when the temperature rises, and vice versa. 

Infl uence of temperature fl uctuations of ±1°C at various temperatures and humidities: 

%rh 10 °C 20 °C 30 °C 50 °C 70 °C 

10 %rh ±0.7% ±0.6% ±0.6% ±0.5% ±0.5% 

50 %rh ±3.5% ±3.2% ±3.0% ±2.6% ±2.3% 

90 %rh ±6.3% ±5.7% ±5.4% ±4.6% ±4.1% 

It is extremely important that the probe and the sample to be measured have the same temperature to 

achieve useful measurements. 

To gain a better understanding of the relationships, we refer to the h-x diagram of humidity in air 

(Mollier’s diagram). This illustrates clearly the relationship between temperature, moisture content and relative 

humidity. 

Relative humidity below 0°C 

At temperatures below 0°C, the saturation pressure above water in liquid form (supercooled): e w differs 

from the saturation pressure above ice: e i . 

e w = Water vapour saturation pressure 

e i 

above water at ambient temperature 

= Water vapour saturation pressure 

above ice at ambient temperature 

T e w e i %rh 

°C hPa hPa – 

0 6.11 6.11 100 

–5 4.22 4.02 95 

–10 2.87 2.60 91 

–15 1.91 1.65 87 

–20 1.26 1.03 82 

–25 0.81 0.63 78 

–30 0.51 0.38 75 

For this reason, a measurement of 75%rh at -30°C corresponds to saturation (100%rh) above ice.

Humidity measurement in solids 

Theory 

Similar to gases, solids such as paper or food can also absorb and retain water or desorb it. Materials with 

this property are called hygroscopic. Depending on the point of view, there are two different observations 

that characterise the humidity state of a material. 

Water content 

The water content of a material is the amount of water contained in the material, expressed in percentage 

of weight. This aspect is interesting for situations, where a material is sold by weight. However, if we talk of 

the physical properties of a material, then the water content is of no interest, as it provides no meaningful 

information. 

Equilibrium humidity 

A hygroscopic material tries to establish equilibrium of its humidity with that of its environment. The presence 

of water in the material produces a water vapour pressure (pm) on the material surface. If this pressure 

(pm) is equal to the water vapour pressure (p) of the ambient atmosphere, then the material achieved 

equilibrium humidity with its environment. Any difference between the pm and the p produces a water exchange 

and therefore a change of the water content of the material concerned, until equilibrium is achieved. 

Equilibrium humidity of a material is therefore defi ned as the relative humidity of the ambient atmosphere 

that has to prevail in order to cause no exchange of water. 

Water activity 

The relative humidity, which must prevail in the surrounding atmosphere to avoid water exchange between 

material and air, is defi ned as water activity. It is practically the same as the equilibrium humidity of a material 

in the defi nition, but is not stated in 0….100%, but in 0…1Aw. The water activity is a measure of the 

degree of freedom of the water retained in various ways in a material. 

The water activity directly determines the physical, mechanical, chemical and microbiological properties of 

the material as well as interactions, such as pourability, lump formation, cohesion, static electricity, etc. In 

the food industry, water is a highly signifi cant factor in the shelf life of semi-fi nished and fi nished products. 

Sorption isotherms 

At equilibrium, the relation between water content and equilibrium humidity of a material can be displayed 

graphically by a curve, the so-called sorption isotherm. 

For each humidity value, a sorption isotherm indicates the corresponding water content value of the material 

at a given, constant temperature. If the composition or quality of the material changes, then its sorption 

behaviour also changes. Because of the complexity of sorption processes, the isotherms cannot be determined 

by calculation, but must be recorded experimentally for each product. Therefore in practice, water 

content and water activity should be viewed as two independent parameters. 

T 

H 

E 

O 

R 

Y 

105

T 

H 

E 

O 

R 

Y 

106 

h-x diagram

1 Explanations of characters 

Explanations to the h-x diagram 

1.1 ß: Dry air quantity in kg per m 3 process air 

1.2 t: Temperature of the process air in °C 

1.3 x: Water vapour content in g per kg dry air of the process air 

1.4 h: Heat content (enthalpy) in kJ per kg dry air of the process air 

1.5 ϕ: Relative humidity of the proces air 

1.6 Δh : Heat consumption in kJ per kg water 

Δx 

NB: We designate prcess air as air in different states, as found during drying (fresh air/warmed 

air from the furnace and/or a heater/conditioned air, also exhaust air). 

2. Use of the h-x diagram 

2.1 Dry air porition ß in kg per m 3 process air 

Example: 

Measured values of the exhaust air in a drying plant tA=46°C; ϕ = 80%rh; 

exhaust air quantity 12000m 3 /h 

The line drawn parallel to the dotted lines of the diagram through the status point of the exhust 

air (Intersection of the t-line 46°C and the humidity curve 80%) results in its extension at 

the Intersection with the left margin scale at ß=1,018kg dry air per m 3 of this exhaust air. At 

12000m 3 /h, the dry air quantity is thus 12000 • 1,018=12200kg/h. 

2.2 Water vapour content in g per kg dry air of the process air 

2.2.1 The vertical line drawn through the status point (in our example 46°C; 80 %rh) results at the 

intersection with the horizontal abscissa a water vapour content of x 2 =54g per kg dry air of this 

exhaust air. 

2.2.2 If the hot air fed into the drying chamber is created by heating outside air (in the example temperature 

20°C; 70%rh) this hot air brings x 1 = hot water per kg dry air with it (determined 

of x 1 = 10g hot water per kg dry air with it (determination of x 1 as described in 2.2.1]). 

this means that each kg of dry air has absorbed Δx = x 2 - x 1 =44g Wasser aufgenommen hat. 

2.2.3 With 12200kg dry air/h, 12200 • 0,044=536,8kg water are withdrawn from the product being 

dried per hour. 

2.3 Heat content inkJ per kg dry air of the processed air. 

2.3.1 The line drawn parallel to the lines of equal heat content (h lines) through the status point (in 

our example 46°C; 80%rh) results on the one hand at the intersection with the inclined abscissa 

in a heat content h 2 =185kJ/kg dry air of this exhaust air. 

(Conversion to kcal: 1kcal=4,1868kJ). 

On the other hand this extended parallel line in the upper part of the diagram helps to determine 

the approximate hot air temperature (see 2.5) for this heat content. 

2.3.2 The heat content of the outside air (in our example 20°C; 70%) is h 1 =45kJ, 

(determined as described in 2.3.1) so that heating by Δh=h 2 -h 1 =140kJ per kg dry air is necessary 

for drying. 

However, the actual heating must be higher than this Δh, due to various heat losses such as 

radiation, heating of the goods to be dried, the drying cars and frame etc. But for well insulated 

plants, no more than 15 kJ/kg dry air. 

2.3.3 The theoretical heat consumption in our example is thus: 

12200 • 140=1,708 million kJ/h. 

2.4 Theoretically required heat quantity per kg of expelled water: 

The parallel line drawn through the zero point to the connecting line of the status points for outside 

air and exhaust air indicates the theoretical heat consumption at the intersection with the right margin 

scale: 

Δh 

=318 

kJ 

theor. heat consumption 

Δx kg 

per kg H2O calculation: 

Δh (from 2.3.2) = 140 = 3182 kJ 

Δx (from 2.2.2) 0,044 kg 

2.5 Hot air temperature 

The vertical line drawn through the status point of the outside air (see 2.2.2) intersects with the h line 

of the exhaust air (see 2.2.1) at a particular point. If one draws a line through this point parallel to the 

lines of equal temperature (t lines), one obtains the theoretically required hot air temperature at the 

intersection with the ordinate, in our example 157°C. 

T 

H 

E 

O 

R 

Y 

107

T 

H 

E 

O 

R 

Y 

108 

Humidity defi nitions 

Theory 

Relative humidity (%rh) 

Is defi ned as the ratio of the quantity of water vapour present in the air to the maximum possible water vapour 

at the same temperature. 

Dew point (Dp) 

The dew point is that temperature, where gas being cooled, begins to condense water vapour into liquid 

water. The dew point may also occur below 0°C (super-cooled water). This point has to be distinguished 

from freezing point (see below). 

Frost point (Fp) 

The frost point is that temperature, where gas being cooled begins to condense water vapour in the form of 

ice. Freezing point occurs only at temperatures below freezing. 

Water vapour density (Dv) in g/m 3 

This is the ratio between the mass of the water vapour to the volume of the gas mixture, in which the water 

vapour is. 

Water vapour content (Q) in g/kg 

This is also called specifi c humidity and is the ratio between the mass of the water vapour to the mass of 

the gas mixture, in which the water vapour is. 

Mixing ratio ( R) in g/kg 

This is the ratio of the mass of the water vapour to the mass of the dry gas mixture, in which the water vapour 

is. 

Water vapour partial pressure (E) in hPa 

This is the pressure of the gaseous phase of the water in a gas mixture. 

Water vapour saturation pressure (Ew) in hPa 

This is the maximum pressure that the water vapour can reach at saturation for the appropriate temperature. 

Enthalpy (H) 

Enthalpy is the measurement for the determination of the energy required, to change the gas mixture from 

a certain temperature/humidity state to another. Enthalpy is not used as an absolute value, but as the difference 

between two points of particular interest. The choice of 0 °C and 0 %rh for zero enthalpy was arbitrary. 

Mixing ratio/Volume (PPMv) 

This is the relationship between the number of water vapour molecules to the number of molecules of the 

other components in the gas. Once this value is determined, it does not change with pressure or temperature. 

Common faults/remedies 

Not only humidity, but also many other physical parameters are measured in industrial processes. The 

most important are temperature, pressure, air speed, etc. The measurement of humidity is different to other 

parameters in one important aspect, namely that humidity cannot be considered as an absolute value, because 

the measuring principle is based on the exchange of water vapour between the sensor and the surrounding 

gas or gas mixture, e.g. air. 

In our capacity as experienced manufacturer, we are well aware of our responsibility to provide our customers 

with instruments, that will withstand even the most demanding operating conditions and which 

are at the same time easy to use and require little maintenance. However, we wish to remind our customers, 

that our instruments will provide an excellent service and provide accurate results, if the following list 

of simple operation and maintenance instructions are followed: 

1. Analysis of the measuring medium, in which the probe is to be used. What suspended matter and/or 

chemicals are present and in what concentration? 

2. The probe should be mounted at the correct measuring location, and not where it is most convenient. 

3. In case of doubt please contact your ROTRONIC representative. 

4. The fi lter has to be changed regularly, if the probe is used in demanding environments. ROTRONIC fi lters 

can be cleaned in an ultrasonic bath with suitable detergents. However, it is advisable to keep a spare set 

in stock. 

5. The perfect function of the sensor should be checked every 6 to 12 months. 

6. Calibration of the sensor can be performed by the user with the help of the SCS certifi cated humidity 

standards, supplied by ROTRONIC. Calibration of the instruments will ensure, that your measurements 

are always verifi able.

ROTRONIC Humidity sensors 

Theory 

With the HYGROMER ® series, ROTRONIC provides the most advanced capacitive polymer sensor system 

for relative humidity measurement. It is the sensor with the largest temperature range (-50…200 °C) available 

on the market. This measuring principle is recognised internationally and is based on the change of the 

dielectric properties of a polymer as a function of the prevailing relative humidity. The polymer used for 

the HYGROMER ® sensor is hygroscopic and has a natural tendency towards equilibrium with the humidity 

environment which surrounds it. A corresponding water vapour pressure is formed at the surface of the 

polymer depending upon the temperature and the amount of water absorbed into the polymer. Any difference 

between this water vapour pressure and the water vapour pressure of the environment is balanced 

by an exchange of water molecules until the two are equal. These changes are measured electrically, amplifi 

ed and indicated as relative humidity. The amount of water which is absorbed into the polymer is determined 

by the ambient humidity and temperature, thus the resulting dielectric properties of the sensor 

refl ect the percentage relative humidity (%rh) to which the sensor is exposed. 

For many years, the ROTRONIC HYGROMER ® C94 was the best sold sensor. With the disappearing of the 

Hygrolyt sensors, new elements were developed in order to even better fulfi l the customers requirements. 

An industry sensor does not necessarily need the same properties as a sensor for Water Activity or a sensor 

for high-humidity applications. The new sensors represent the results of a continuous research and development. 

Sensor Designation Used for Improvements: 

HYGROMER ® IN-1 Industry applications Gold connectors, 

Temperature range: Meteorology better chemical resistance, 

-50...200°C Food technology no corrosion after condensation 

Laboratories 

Cold rooms 

Drying processes 

Incubators 

HYGROMER ® AC-1 HVAC applications Better chemical resistance, 

Temperature range: Cold rooms better Long-term-stability 

-30...100°C Storage and transport 

Wine cellars 

Greenhouses 

Museums 

Churches 

HYGROMER ® WA-1 Water Activity- applications Optimised dimensions for 

Temperature range: Food/pharma quality assurance minimal chamber volume, 

-30…100°C Product stability Very little hysteresis 

Shelf life determination 

HYGROMER ® RS-70 High humidity- applications Heated sensor, 

Temperature Range: Cheese stocks no condensation, 

-50…180°C Meat processing better accuracy in 

Tropical greenhouses high range of humidity 

Test environments 

Climatic chambers 

HYGROMER ® RS-20 Brick- and tile making Mechanical stability 

Temperature range: Wood-industry Fast response 

-50…180°C 

HYGROMER ® humidity sensors are always fi tted to a probe or instrument. Thanks to the ROV interface, 

probes and instruments with HYGROMER sensors can be connected to any display unit with ROV input. 

(10 mV/ °C and 10 mV/%rh) 

Characteristics of the sensor 

Response time/Time constant 

The time constant of a sensor is defi ned as the time required to perform 63% of a humidity change. The 

time constant is larger at low temperature, low air movement and high humidity. The time constant also 

increases when a fi lter is used. The fi lter reduces the airfl ow over the sensor and a slower diffusion of water 

molecules results in a slower response time. Therefore humidity equilibrium is reached after an extended 

period of time. 

Reproducibility 

The specifi cations stated refer to a humidity cycle of 10-95-10 %rh. 

T 

H 

E 

O 

R 

Y 

109

T 

H 

E 

O 

R 

Y 

110 

Pollutant table 

Theory 

The following gases have, in the given concentrations, no or little infl uence on the sensor and the humidity 

measurement. The data is only a guide. The resistance of the sensor depends strongly on the temperature 

and humidity conditions and the duration of the exposure to the pollutant. 

Allowed fault caused from the pollutant: ±2%rh 

Pollutant Formula Maximum Workplace Allowed Concentration 

Concentration Continuous Operation 

ppm mg/m 3 ppm mg/m 3 

Acetic acid CH3COOH 10 25 800 2000 

Acetone CH3COCH3 1000 2400 3300 8000 

Ammonia NH3 25 18 5500 4000 

2-Butanone (MEK) 300 1200 150000 

Chlorine Cl2 0.5 1.5 0.7 2 

Ethanol C2H5OH 1000 1900 3500 6000 

Ethyl acetate CH3COOC2H5 400 1400 4000 15000 

Ethylene glycol HOCH2CH2OH 100 260 1200 3000 

Formaldehyde HCHO 1 1.2 2400 3000 

Hydrochloric acid HCl 5 7 300 500 

Hydrogen sulphide H2S 10 15 350 500 

Isopropanol (CH3)2CHOH 400 980 4800 12000 

Methylethylketon C2H5COCH3 200 590 3300 8000 

Nitrogen oxides NOx 5 9 5 9 

Ozone O3 0.1 0.2 0.5 1 

Sulphur dioxide SO2 5 13 5 13 

Toluene / Xylene C6H5CH3 100 380 1300 5000 

Xylol C6H5(CH3)2 100 440 1300 5000 

Practical limits 

The specifi ed operating ranges must be complied with, otherwise signifi cant errors can arise or the measuring 

element could be destroyed. 

A replaceable dust fi lter must be used in dusty environment. 

Oil and grease vapours will damage the sensor, as they can condense on the sensor and thus prevent or 

inhibit response (insulating layer). Flue gases can therefore not be measured . 

A fi lter must be used at air velocities above 3 m/s. The sensor must also be protected mechanically from the 

high air velocities above 40 m/s (for fi lters, see general accessories). 

Sensor properties HYGROMER ® 

Operating range IN-1 AC-1 WA-1 RS-20 RS-70 

Humidity 0…100%rh 

Temperature in °C -50…200 -30…100 -20…180 

Air velocity in m/s without 

ohne Sensorschutz 3 m/s 

Air velocity in m/s with sensor 

protection sensor protection 20–40 m/s 

Output signals capacitance range 

Reproducibility better than 0.5%rh 

Long-term stability

Alphabetical Index 

Keyword Page 

A 

A1 11, 13 

AC-Adaptor 24 

Agent-Accessories 24 

Agent-D HT2-EX 20 

Agent-D-DataP 24 

Agent-D-NT3 20 

Agent-D-PT4 20 

Alarm device 44–45 

Anti theft device 24 

AW Quick function 78 

B 

Bacteria 76 

C 

Calibration device 98 

Carrying case AC1115 11 

Ceramics industry 27 

Customer branding 92, 93 

D 

Dataloggers 14 

Digital output signal 31 

Docking station 5 

Drying process 27 

E 

Equilibrium relative humidity 76, 85 

Extension cable 39 

F 

FDA21 CFR Part 11 100 

Filters 36, 39, 57 

G 

GTS-Set 11 

H 

Halophile bacteria 76 

High temperature applications 27, 29, 34 

HPH Signal booster 66 

Humidity standard 96, 97 

HumidityTheory 104 

HW3 software 16, 100 

hx diagram 106 

HygroClip, various 8, 9, 18, 19, 34, 35, 37, 39,64 

Hygrodata quick 102 

HygroFlex 30ff 

HygroLab 80 

HygroLog Accessories 24 

HygroLog, HygroLogD 16 

Hygromer sensor 109 

HygroPalm /1/2/3 16 

HygroPalm Aw1 81 

HygroPalm-Set 10 

Hygrowin 65 

I 

I-1000 Transmitter 56–61 

Impact protection 24 

Industrial probes 34 ff 

Installation 43 

Intrinsically safe 56 

Humidity and temperature measurement 

Keyword Page 

M 

M1/M2/M3 48–52 

Meteorology probes 71–75 

Mildew 76 

MOC, MOC3 64 

Moisture content 85 

MOK, MOK3, MOK-WIN 50, 64, 65 

Mounting Accessories 60 

M-Series Transmitter 46ff 

N 

Networking 24 

O 

OEM Products, OEM Sensors 92ff 

Osmiophile yeast 76 

P 

Paper industry 11, 27 

Pollutant table 110 

Portable Analyser 76, 81 

PPS probe 8, 56 

Pressure probe 32 

Printer, Printer cable 24 

Probe extension cable 24, 36, 65 

Probe Simulator 65 

Psychrometric calculations 103 

R 

Radio Option 33 

Remote control 

Roline L Transmitters 53–55 

S 

SCS 46, 97 

Sensor protection 36 

Software validation 16, 100ff 

T 

Temperature Adaptor 12 

Temperature Logger 20 

Temperature probes 22 

Transmitter 28ff 

V 

VHTS2-shield 70, 74 

W 

Wall mounting bracket 24 

Water Activity 76ff 

Weather protection shield 70 

X 

Xerophile mildew 76 

Y 

Yeast 41 

Z 

Zener barrier 37, 39 

I 

N 

D 

E 

X 

111

O 

N 

- 

L 

I 

N 

E 

S 

H 

O 

P 

S 

112 

Switzerland: 

www.humidity-shop.ch 

www.humidity-shop.ch 

France: 

www.rotronic.fr 

www.rotronic.fr 

ROTRONIC On-Line Shops 

Visit us On-Line! 

Germany: 

www.rotronic-shop.de 

www.rotronic-shop.de 

England: 

www.humidity-shop.co.uk 

www.humidity-shop.co.uk

1. General 

1.1 These general conditions of sale and supply 

shall be binding when such have been 

stated as being applicable in an offer or 

confi rmation of order of and by ROTRONIC 

Instruments (UK) Ltd 

1.2 Orders shall only become binding upon 

ROTRONIC Instruments (UK) Ltd after it has 

issued a written confi rmation of order. 

1.3 These general conditions of sale and supply 

shall become valid as from January 1, 2000. 

2. Prices 

Prices shall be deemed net plus transportation 

and packaging charges (V.A.T. at prevailing rate 

applies), provided that alternative conditions have 

not already been agreed. ROTRONIC Instruments 

(UK) Ltd however hereby reserves the right to 

make price adjustments to cover defi nite increases 

in costs as for example the cost of wages, goods 

and materials. 

3. Delivery period 

The delivery period shall be the date laid down 

in the contract of sale and such may be extended 

should diffi culties arise that may have been caused 

by act of God or force majeure such as war, epidemics 

and among other things storm and tempest. 

4. Despatch 

All deliveries shall be effected for the account and 

the risk of the customer. Any complaints concerning 

damage, loss or delay are to be reported to 

ROTRONIC Instruments (UK) Ltd within 7 days after 

the receipt of the consignment; but complaints 

concerning any faulty packaging shall be rendered 

on the same day as the receipt of the consignment. 

5. Works deliveries 

Should the consignment and invoicing be directly 

effected by the works supplier of ROTRONIC 

Instruments (UK) Ltd, the conditions of sale and 

supply of that particular works supplier shall be 

valid for customers in respect of that particular 

contract. In such cases, these present conditions 

of sale and supply shall have no validity and damage 

indemnity claims or claims of any other nature 

cannot be made enforceable against ROTRONIC 

Instruments (UK) Ltd hereunder. 

6. Return of goods and materials 

The return of goods and materials shall require 

the written permission of ROTRONIC Instruments 

(UK) Ltd and may only be effected if the goods and 

materials are in irreproachable condition and still 

in their original packaging, and only then if such 

are usually maintained in stock by ROTRONIC 

Instruments (UK) Ltd. A copy of the delivery note 

or the invoice must be enclosed. Returns without 

either a copy of the delivery note or the invoice will 

not be accepted. An appropriate surcharge will be 

levied by ROTRONIC Instruments (UK) Ltd on the 

purchaser to defray the cost of any inconvenience 

caused. 

Terms and Conditions of Trading 

7. Settlement 

Provided that alternative conditions have not already 

been agreed, invoices are to be settled net 

within 30 days without any deductions. Purchasers 

will be charged the usual bank overdraft rate of interest 

in respect of overdue payments. 

8. Retention of ownership rights 

All goods and materials supplied shall remain the 

property of ROTRONIC Instruments (UK) Ltd until 

full payment of the debited invoice amount shall 

have been received. The purchaser and the holder 

of the goods and materials shall in addition be under 

a duty hereunder to contract insurance cover 

for the goods and materials and, in their capacity 

as the insured, to assign any insurance claim of the 

purchaser to ROTRONIC Instruments (UK) Ltd 

9. Warranty 

ROTRONIC Instruments (UK) Ltd will grant a warranty 

for plant and equipment for a period of 24 

months from the date of delivery in respect of 

any evidenced faulty workmanship and materials. 

Should a delivered consignment prove to be 

contrary to contract upon inspection, the customer 

shall grant ROTRONIC Instruments (UK) Ltd the 

opportunity hereunder of removing the fault, or 

else the customer may demand replacement. 

Should the supply or delivery of any improvement 

or replacement not prove possible, the customer 

may choose between having the purchase price 

reduced or in demanding the contract of, sale to 

be rescinded (conversion). Damage resulting from 

natural wear and tear, act of God, force majeure, 

non compliance with the operating instructions 

shall be excluded from the warranty as well as mechanical 

interference by the customer or by third 

parties with plant and equipment of ROTRONIC 

Instruments (UK) Ltd without its written permission. 

10. Cancellation 

Cancellation of orders shall only be possible hereunder 

with the written approval of ROTRONIC 

Instruments (UK) Ltd. Any costs which shall have 

already been incurred or price increases as a result 

of reductions in amounts ordered shall be for the 

account of the purchaser. Partial supplies of an 

order contracted upon call shall be claimed within 

the agreed supply and delivery periods, otherwise 

ROTRONIC Instruments (UK) Ltd may cause the 

relative consignment and invoice billing there fore 

to be made. 

11. Place of jurisdiction 

The place of jurisdiction hereunder shall be 

London, England. The purchaser expressly declares 

and agrees hereunder to waive the usual 

place of domicile as place of jurisdiction in favour 

of the foregoing jurisdiction agreed hereunder. 

Legal relationships hereunder shall be subject to 

UK law.

HUMIDITY / TEMPERATURE MEASUREMENT - Omni Instruments

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?