Level transmitter LT 100

© KROHNE 09/2001 7.02363.21.00
GR/PRINTO
Level transmitter
LT 100
Status: 10/99
Variable area flowmeters
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Communications engineering
Engineering systems & solutions

Level transmitter
LT 100
For long-distance transmission of liquid
level data
Operating principle
Housing
The device operates on the float principle.
A float guided on a non-magnetic tube
follows the level of the liquid surface, thereby
actuating the reed switches located inside
the tube by means of a built-in magnet
system. The reed switches shunt over parts
of a resistor string. The magnet system
operates the reed switches according to the
position of the float and thus causes the
resistance of the resistor string to change as
a function of the liquid level. The float travel
distance can be limited by stops fitted to
the guide tube. The signal conditioner produces
an output signal from 4 – 20 mA.
Gasket
Threaded connection
Upper end stop
Guide tube
Resistor string with
reed switches
Float
Magnet system
Lower end stop
128

LT 100
Application range
Simple and
rugged design for
pressures up to
40 bar/580 psig and
temperatures
up to 130°C/266°F)
Wetted parts of
stainless steel;
for aggressive
products coated
with PVC, PP,
PVDF, PTFE
Long-distance
data transmission
up to 2000 m
Guide tube
length
0.3 – 6 m
Interface
detection also
possible
The LT 100 is designed for liquid level measurement in storage or
process tanks.
The products must not be adhesive or of high viscosity.
The min. density is 0.4 kg/l or 25 lb/ft 3
Optional: Interface level between two immiscible liquids.
The difference in density between both liquids needs to be min.100 g/l.
Typical liquids are:
● Water and aqueous liquids
● Acids/alkalis
● Organic and inorganic solvents
All wetted parts can be coated with plastic for use in aggressive media.
Product
Overview
Continuous, non-contact Switches
Ultrasonic Radar Ultrasonic Buoyancy Capacitance
Continuous, contact
Ultrasonic Buoyancy TDR
Vibration
LT 100 129

LT 100
Responsibility for suitability and intended use of our instruments rests solely with the purchaser.
Technical data
Measuring conditions
Product
Liquids
Temperature
–40 … +130°C (–40 … 266°F)
Density
≥ 0.4 kg/l (≥ 25 lb/ft)
Operating pressure
≤ 40 bar (≤ 580 psig)
Ambient temperature
Polycarbonate housing
–30 … +60°C (–22 … +140°F)
Aluminium housing
–40 … +60°C (–40 … +140°F)
Overall length
0.3 – 6 m (1 – 20 ft)
Measuring accuracy
Standard ±10 mm (±0.4’’)
Option ± 5 mm (±0.2’’)
Important: note specified float operating data, see table “Float Selection”
Materials
Housing
Standard
Option
Gaskets
Connection
Housing cover
Polycarbonate
Cast aluminium with epoxy finish
Nitriles
Buna-N
Screw connection Stainless steel 316 L (1.4435, 1.4404)
Flange
Standard Stainless steel 316 L (1.4435, 1.4404)
Option
Stainless steel, coated (PVC, PP, PVDF, PTFE)
Guide tube
Standard Stainless steel 316 L (1.4435, 1.4404)
Option
Stainless steel, coated (PVC, PP, PVDF, PTFE)
Float
See table “Float Selection”
Connection
Screw connection
G1’’, 1’’ NPT
Flanges DN 50, PN 10
DN 100, PN 40
2’’ ANSI, 150 lb
4’’ ANSI, 300 lb
Other connections on request
Protection category IP 66
Terminals (max. wire cross-section) 1.5 mm 2 (AWG 14)
Cable entry
Polycarbonate housing
PG 13.5 (polyamide)
Aluminium housing
PG 13.5, option PG 16 (nickel-plated brass)
Current output
4 – 20 mA
Electromagnetic compatibility (EMC) to EN 50081-1, EN 50082-2
130 LT 100

LT 100
Float selection
Select float as a function of the pressure, temperature and density of the liquid.
In addition, the required degree of corrosion resistance must be considered.
Shape Dimensions Material Min. density Max. Max.
in mm (inches) kg/l (lb/ft 3 ) operating product
L ≤ 4 (≤ 13.12 ft)/ pressure temperature
L > 4 (> 13.12 ft) in bar (psig)* in °C (°F)
Ball dia. 142 x 157 x 1.0 Stainless steel 316 Ti 0.55 / 0.6 35 (507) – 40 … +130
(5.59 x 6.18 x 0.04) (1.4571) (34.34) / (37.46) (– 40 … +266)
dia. 142 x 157 x 0.7 Stainless steel 316 Ti 0.4 / 0.5 20 (290) – 40 … +130
(5.59 x 6.18 x 0.027) (1.4571) (24.97) / (31.21) (– 40 … +266)
Cylinder dia. 90 x 140 Stainless steel 316 L 0.8 / 0.9 40 (580) – 40 … +130
(3.54 x 5.51) (1.4435, 1.4404) (49.94) / (56.19) (– 40 … +266)
dia. 64 x 140 Stainless steel 316 Ti 0.9 / – 25 (362) – 40 … +130
(2.52 x 5.51) (1.4571) (56.19) / – (– 40 … +266)
dia. 90 x 100 PVC 0.7 / – 4 (58) – 10 … + 60
(3.54 x 3.94) (43.70) / (43.07) (– 14 … +140)
dia. 90 x 100 PP 0.55 / 0.55 4 (58) – 20 … +110
(3.54 x 3.94) (34.34) / (34.34) (– 44 … +230)
dia. 90 x 100 PVDF 0.9 / 0.9 4 (58) – 40 … +130
(3.54 x 3.94) (56.19) / (56.19) (– 40 … +266)
dia. 90 x 125 Hard glass** 0.8 / 0.8 4 (58) – 40 … +130
(3.54 x 4.92) (49.94) / (49.94) (– 40 … +266)
L = length guide tube
** The specified operating pressure applies to 20°C/68°F only!
** Hard glass float used for PTFE instrument version.
Float test pressure = 1.3 times the max. allowable operating pressure.
Data transmission system and electrical connections
All types supply directly a current of 4 – 20 mA via the built-in converter.
The signal conditioner PROFSI, with or without galvanically isolated output, is available for the intrinsically safe version.
With the C 90 digital indicator the liquid level can be displayed on a 4-character LED display.
Device designation …ER (ER/BRX) …ER (EExi)
Overall length
Standard ≤ 4000 mm (≤ 13 ft) ≤ 4000 mm (≤ 13 ft)
Option ≤ 6000 mm (≤ 20 ft) ≤ 6000 mm (≤ 20 ft)
Measuring error
Standard ± 10 mm (≤ 0.4’’) ± 10 mm (≤ 0.4’’)
Option ± 5 mm (≤ 0.2’’) ± 5 mm (≤ 0.2’’)
Ambient temperature –20 … +70°C (–4 ... +158°F) –20 … +70°C (–4 ... +158°F)
(higher temperatures on request)
Current output 4 – 20 mA 4 – 20 mA
Power supply 14 – 36 V DC with reverse-polarity protection 14 – 30 V DC
Max. load
(U-12 V) / 20 mA, max. 500 Ω
(U-12 V) / 20 mA, max. 500 Ω
Process temperature –20 … +135°C –20 … +135°C
(–4 ... +275°F) (–4 ... +275°F)
others supplied on request
others supplied on request
Electromagnetic compatibility (EMC) EN 50081-1, EN 50082-2
Self-inductance – negligible
Self-capacitance – negligible
Product
Overview
Vibration
Continuous, non-contact Switches
Ultrasonic Radar Ultrasonic Buoyancy Capacitance
Continuous, contact
Ultrasonic Buoyancy TDR
LT 100 131

LT 100
Signal conditioner PROFSI
Dimensions in mm (inches)
Power supply
Standard
Option
Power consumption
230 V AC, (±10%), 50 Hz
24, 48, 115 V AC, 50 Hz,
24 V DC (±10%)
AC = 4 VA; DC = 3 W
Protection category
(EN 60529/lEC 529) IP 20 (equivalent to NEMA 1)
Ambient temperature –20 … +60°C (–4 … +140°F)
Current output 4 – 20 mA
Load
≤ 850 Ω
Linearity < 0.1%
Housing
Attachment
Snap-on mounting on 35 mm, standard rail to DIN 46 277
Screw mounting Dimensions to DIN 43 604
Connection
Self-opening binding posts
Max. cross-section 2 x 2.5 mm 2
Material
Polyamide
Electromagnetic
compatibility (EMC) to EN 50081-1, EN 50082-2
Ex
PROFSI
35.5 (1.40“) 110 (4.33“)
75 (2.95“)
Digital indicator C 90
Dimensions in mm (inches)
Power supply
Standard
230 V AC (±10% ), 50/60 Hz
Option
115 V AC (±10% ), 50/60 Hz
Power consumption 6 VA
Protection category IP 63
(EN 60529/IEC 529)
Ambient temperature –20 … +70°C (–4 … 158°F)
Current output 4 – 20 mA
Load
15 Ω
Display Digital (–9999 – +9999)
4-digit with LED
Height of digits 14 mm
Housing material Makrolon
Electromagnetic
compatibility (EMC) to EN 50081-1, EN 50082-2
43 (1.69”)
90 (3.54”)
min. clearance when mounting several
digital indicators in one panel
23 (0.91”)
43 (1.69”)
≥ 10
(≥ 0.4”)
44 (1.73”)
≥ 20
102 (4.02”)
≥ 40
(≥ 1.57”)
91 (3.58”)
48 (1.89”)
7,5 (0.3”)
(≥ 0.79”)
132 LT 100

LT 100
Dimensions and weights
The weights refer to devices with 1000 mm guide tube and DN 50 flange.
The flange DN 100 weighs an additional 0.7 kg.
Every additional 100 mm or 4’’ tube length:
≤ 4000 mm (≤ 13.12 ft) = 0.06 kg (0.13 lb)
> 4000 mm (> 13.12 ft) = 0.16 kg (0.36 lb)
Additional weight for: connection “04” = 5.4 kg (12.1 lb)
cast aluminium housing = 0.7 kg (1.6 lb)
Weights of devices with ANSI flanges equivalent to those with
the same DIN nominal size, with the following variations:
2’’ Class 150 lb/RF “07” –0.8 kg (–1.8 lb)
4’’ Class 150 lb/RF “08” –0.5 kg (–1.1 lb)
2’’ Class 300 lb/RF “09” +0.2 kg (+0.5 lb)
4’’ Class 300 lb/RF “10” +3.7 kg (+5.9 lb)
Product
Overview
Vibration
Dimensions in mm (inches)
LT 100
Polycarbonate
housing
LT 100
Aluminium
housing
Aluminium housing with
coated version
LT 100/R – PVC/03/PC
LT 100/R – PP/03/PC
LT 100/R – PVD/03/PC
4.6 kg
(10.3 lb)
Standard version
LT 100/R – /01/PC
1.8 kg
(4.0 lb)
* L > 4000 mm
* or > 13.12 ft
Coated version
LT 100/R – PTFE/03/PC
5.9 kg
(13.2 lb)
Flange version
LT 100/R – /03/PC
4.1 kg
(9.2 lb)
* L > 4000 mm
* or > 13.12 ft
Version with
aluminium housing
LT 100/R – /01/AL
2.5 kg
(5.6 lb)
Continuous, non-contact Switches
Ultrasonic Radar Ultrasonic Buoyancy Capacitance
Flange version with
aluminium housing
LT 100/R – /03/AL
4.8 kg
(10.8 lb)
* L > 4000 mm
* or > 13.12 ft
Aluminium housing
with coated version
LT 100/R – PVC/03/AL
LT 100/R – PP/03/AL
LT 100/R – PVDF/03/AL
5.3 kg
(11.9 lb)
* L > 4000 mm
* or > 13.12 ft
Aluminium housing
with coated version
LT 100/R – PTFE/03/AL
6.6 kg
(14.8 lb)
Continuous, contact
Ultrasonic Buoyancy TDR
* L > 4000 mm
* or > 13.12 ft
* L > 4000 mm
* or > 13.12 ft
LT 100 133

LT 100
Electrical connection
ER (BRX)

LT 100
Approvals
Application
Intrinsically safe hazardous-duty version for use in Zone 1
(EEx ia IIC T6)
Flameproof enclosure (EEx d IIC T6) for use in Zone 1
Signal conditioner PROFSI (EEx ia IIC) for use in Zone 1
Instrument version
LT 100/.. /ER(EExi)
LT 100/.. /ER(BRX)
Certification mark
L.C.I.E.-No. 92.C 6123X
L.C.I.E.-No. 87.B 6099X
L.C.I.E.-No. 91.C 6066X
Product
Overview
Continuous, contact
Ultrasonic Buoyancy TDR
Continuous, non-contact Switches
Ultrasonic Radar Ultrasonic Buoyancy Capacitance
Vibration
Type code
Instrument
LT 100 Level transmitter
Materials
R Stainless steel 316 L (1.4435, 1.4404)
R-PVC Stainless steel 316 L (1.4435, 1.4404), PVC coated
R-PP Stainless steel 316 L (1.4435, 1.4404), PP coated
R- PVDF Stainless steel 316 L (1.4435, 1.4404), PVDF coated
R-PTFE Stainless steel 316 L (1.4435, 1.4404), PTFE coated
Connection*
01 G1A 06 DN 100, PN 40
02 NPT 1" 07 ANSI 2", 150 lb RF
03 DN 50, PN 16 08 ANSI 4", 150 lb RF
04 DN 100, PN 16 09 ANSI 2", 300 lb RF
05 DN 50, PN 40 10 ANSI 4", 300 lb RF
Housing version
PC Polycarbonate
AL Di-cast aluminium
Application range
N Normal range
BRX Long-distance data transmission system Zone 1, EEx d IIC T6 (explosion-proof)
EExi Long-distance data transmission system Zone 1, EEx ia IIC T6 (intrinsically safe)
TS Interface detection
LT 100
*When ordering, please specify overall length.
LT 100 135

Notes