Pressure Transducer xxx bar 0/4-20mA

Pressure Transducer xxx bar 0/4-20mA Type: MPOGxN.xxx 

This data sheet is valid from Software Release 1.30 . 

Short Description 

Type Measurement 

Range 

MPOGRN.001 

MPOGRN.002 

MPOGRN.005 

MPOGRN.010 

MPOGRN.020 

MPOGRN.050 

MPOGRN.100 

MPOGRN.200 

MPOGAN.500 

MPOGAN.610 

MPOGAN.620 

Order No.: see Table 1 

[bar] [psi] 

0.1 

0.2 

0.5 

1 

2 

5 

10 

20 

50 

100 

200 

Table 1: Measurement Ranges 

Dimensions in mm 

0.5 

3.0 

7.5 

15 

30 

75 

150 

300 

750 

1500 

2900 

Order No. 

0065690.001 

0065690.002 

0065690.003 

0065690.004 

0065690.005 

0065690.006 

0065690.007 

0065690.008 

0065690.009 

0065690.010 

0065690.011 

Piezoresistive transducer with 0/4...20mA output and 3-lead connection (common ground) for the continuous 

measurement of pressure and level. The transducer contains a gauge pressure sensor-element with which it 

compensates for fluctuations in the atmospheric pressure (MPOGAN.xxx: absolute pressure transducer). 

The pressure transducer is suitable for level measurements in open and closed containers (reservoir), level 

measurements using the bubble process as well as for measuring pressure in transport lines. 

The local microcontroller electronics integrated in the transducer housing calculate the pressure in 

consideration of sensor-specific data by means of a polynomial which leads to a very high accuracy. By 

means of temperature measurements directly at the piezoresistive sensor, the pressure signal is 

temperature compensated which results in a very low temperature dependence. The direct digital 

processing of the signals enables digital communication as well as parameterization with the aid of a PC. 

The working range and attenuation of the output current can, to a large extent, be freely set by means of the 

software. 

Additionally, with the aid of setting elements, the working range of the output current can be set on the unit 

within certain limits. 

The faultless functioning of the transducer is monitored by cyclic self-tests. 

9609 Amm,KUA/rt Subject to change Page 1/8 

DG DKap Stamm-Bez. Var Ind F Sp 

Data Sheet Hardware 21.210.0065690.xxx.02.4.4 

© 1999 by Rittmeyer AG, CH-6302 Zug

Pressure Transducer xxx bar 0/4-20mA MPOGxN.xxx 

Technical Data 

Type: MOGxN. 001 002 005 010 020 050 100 200 500 610 620 

Measurement range 

1) (FS) (pre-pressure) [bar] 

[psi] 

0.1 

1.5 

0.2 

3 

0.5 

7.5 

Overload [bar] 2.5 2.5 3 4 7 15 30 60 150 250 500 

Measurement range negative 

2) 

1 

15 

2 

30 

[bar] -0.1 -0.2 -0.5 -1 -1 -1 -1 -1 --- --- --- 

Linearity, Hysteresis [ FS] ≤ 0.25 ≤ 0.15 ≤ 0.15 ≤ 0.15 ≤ 0.15 ≤ 0.15 ≤ 0.15 ≤ 0.15 ≤ 0.15 ≤ 0.15 ≤ 0.15 

and reproducibility -20…+70 °C 

(-4…158°F) 

Thermal Hysteresis [% FS] ≤ 0.4 ≤ 0.2 ≤ 0.1 ≤ 0.1 ≤ 0.1 ≤ 0.1 ≤ 0.1 ≤ 0.1 ≤ 0.1 ≤ 0.1 ≤ 0.1 

Long-term stability typ. [% FS/a] 0.2 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 

Temperature influence 

(T cal = 25 °C or 77°F) 

typ. [ppm/°C FS] 

max. [ppm/°C FS] 

100 

150 

60 

100 

60 

100 

1) An overpressure of +20% of the respective measurement range end value in [bar] is permissible. An additional linearity and Hysteresis 

error of max 0.2% FS or max. 0.4% FS with 0.1bar type must however be taken into consideration. 

2) If the transducer is exposed to negative pressure, an additional linearity and Hysteresis error of max. 0.5% FS must be taken into 

consideration. 

Note: On exceeding 120% of the nominal measurement range in [bar] or on falling below the permissible negative pressure, the 

output current amounts to 0mA, independent of the current range selection. 

Measurement Range Independent Technical Data 

• Output current: 0 ... 20 or 4 ... 20mA 

• Resolution of D/A conversion: 12 Bit (related to the measuring range entered) 

• Measuring rate: 4 pressure measurements per second 

• progr. attenuation (damping) of current output: 0 … 600s 

• SW-Rangeability of zero point and span: as desired 

• HW-Rangeability of zero point: -5 ... +5% of nominal measurement range (FS) 

• HW-Rangeability of measuring span: 95 ... 105% of nominal measurement range 

(FS) 

• Power supply: DC 9.6 ... 28.8V (DC 12 ... 24V ±20%) 

• Current consumption (-20°C...+70°C or -4°F...+158°F): approx. 14mA + Iout ≤ 36mA 

• Resistance load of extension cable MPZVK3: 75mΩ/m (0.5mm2) 

• Permissible load in current output: Rout[Ω] ≤ (Usonde[V] - 4.6[V]) / 0.02[A] 

• Permissible load in power supply: Rsup[Ω] ≤ (Usup[V] - 9.6[V]) / 0.036[A] 

• Overvoltage protection: *) Integrated fine protection for supply and signal 

circuits for transients of up to 500V 

• Reverse polarity protection: Integrated reverse battery protection for supply 

and signal circuits for voltages up to -28.8V 

• Protection class: IP65 (NEMA 4) 

• Operating temperature range: -20oC ... +70oC ( -4°F … +158°F) 

• Storage temperature range: -30oC ... +80oC (-22°F … +176°F) 

• Humidity: 0 ... 95% rel. humidity 

• Weight of pressure transducer without cable: approx. 850g, 1.87 pounds 

• Feeder clamps: 3 terminal screws for wire cross-sections of up 

to 1.5mm2 

• Cable coupling: PG11 glands 

• Threaded connection: Gc ½" (conical), with turning adaptation SW36 

*) For field use with connection cables ≥ 5m in length or ≥ 100m within a building, the optional three-core overvoltage protection MPZOGU 

must be used. 


60 

100 

60 

100 

5 

75 

60 

100 

10 

150 

60 

100 

20 

300 

60 

100 

50 

750 

60 

100 

100 

1500 

60 

100 

200 

3000 

60 

100 





Quality Tests 

CE-conformity to the EMC terms of reference of EU (89/336/EWG) 

The unit meets all requirements for the CE-identification in accordance with: 

• EN 50081-1: 1992 

• EN 50082-2: 1995 

(see also conformity statement 21.281.0012000.001 and conformity evidence 21.280.0012000.001) 

Additional EMC tests 

• Surge ENV 50142, EN 61000-4-5 (IEC 1000-4-5): Test level 3 (2 kV) 

(together with internal overvoltage protection 

MPZOGU) 

(see also conformity evidence 21.280.0012000.001) 

Insulation tests in accordance with IEC 255-5 (without overvoltage protection 

MPZOGU) 

• Pulse withstandability test: Test level 3 (2 kV) 

• Dielectric strength: Test level 4 (AC 1000V, 50Hz, 1 Min.) 

• Insulation resistance: Test level 4 (≥ 100 MΩ) 

ClimaticTest 

Climatic test in accordance with IEC 68-2-38 fulfilled. 

Construction of Pressure Transducer 

The housing material consists of aluminium, the surface is anodized, the colour green-blue (RAL 5021). 

The parts which come into contact with the medium as well as the pressure transmitting separating 

membrane consist of corrosion-resistant steel 1.4435 (316L). The screwed connection itself consists of 

steel 1.4436 (316). 

On use in water, waste water, etc, with a freezing point of 0 o C, the operating temperature is limited to 0 ... 

+70 o C (possible damage to the separating membrane by ice formation). 

Electrical Connections 

(See conformity evidence 21.280.0012000.001 for further information about wiring) 

Terminal screw 

Earth connection 

Cable glands 






Permissible Load 

Rout: permissible load in current output (connection Iout) 

Usonde: supply voltage on the pressure transducer (connection +V) 

Rout[Ω] ≤ (Usonde[V] - 4.6[V]) / 0.02[A] 

Rsup: permissible load in the power supply 

Usup: supply voltage 

Rsup[Ω] ≤ (Usup[V] - 9.6[V]) / 0.036[A] 

Parameterization 

R[ Ω] 

1210 

530 

250 

Rout 

Rsup 

0 9.6 28.8 

U[V] 

The pressure sensor can either be parameterized by the software or, after removing the housing cover, the 

range of the output current can be set within certain limits by means of a slide switch and the zero point and 

the measuring span by means of two trimmers . 

Parameterization by software 

Note: The following software parameterization can be undertaken with the help a MPO-PC adaptation 

MPZPCA and the corresponding MS-DOS based computer software (MPZPCS). 

(see also data sheet 21.210.0065693.001 and operation manual 21.810.0065707.001). 

In order to undertake software settings, switch S2 (SW/HW) must be in the base setting off (SW) position 

(see also under hardware setting possibilities). 

• Range selection of the output current 0 ... 20mA or 4 ... 20mA 

Note: With the range selection 4 ... 20mA, the output, also in the range of ≥1 ... ≤4mA is controlled 

proportionally to the zero point and measuring span settings. Thereby negative pressure for 

example can also be measured. 

The output can be selected up to approx. 20.5mA. 

In the event of failure of the pressure sensor or within the first 5 seconds after applying the 

supply voltage, the output current amounts to 0mA. 

Output current Iout 

Imax 

Imin 

Working range of 

current output 

Inverted control 

Imax typ. 20.5mA 

Imin = 1mA at 4...20mA 

Imin = 0mA at 0...20mA 

Measurement value p 






• Rangeability of zero point and span 

Setting range: as desired 

Note: With the setting zero point > measuring span, a reversal of the output function can be 

achieved. Rising pressure thereby produces falling output current. 

• Programmable attenuation (current damping) of current output 

(Together with MPZPCS from Software Release 1.30) 

The analog output can be attenuated with a low-pass filter of 1st order in the range of 0 … 600s. 

Hint: Select a damping of zero during start-up. 

Example for setting the working range: 

Pressure transducer MPOGRN.010, nominal measurement range (FS) 1bar 

Desired working range: 4mA @ 

PA=0.25bar 

20mA @ 

PE=0.85bar 

Necessary settings: 

Current range: 4 ... 20mA 

Zero point: 0.25bar 

Measuring range: 0.85bar 

Iout 

[mA] 

20.5 

20 

• Recalibration 0% and 100% of the pressure transducer 

Setting range 0%: -5% ... +5% of nominal measurement range (FS) 

Setting range 100%: 95% ... 105% of nominal measurement range (FS) 

4 

1 

0 

0.25 

P A 

Iout 

0.85 

P E 

1 

P FS 

p [bar] 

Note: The pressure transducer is calibrated to the nominal measurement range (FS) ex works. On 

detection of an unmistakable long-term drift, the pressure sensor should preferably be 

returned to the factory for recalibration. A recalibration should only be carried out locally 

when a corresponding reference unit is available. 

Hardware Setting Possibilities 

In order to carry out hardware settings at the unit, switch S2 (SW/HW) must be in the on (HW) position. In 

position off (SW) the settings for S1 (0/4mA) and 0% (zero point), 100% (measuring range) are ineffective. 

• Range selection for the output current 0 ... 20mA or 4 ... 20mA 

S1 (0/4mA) = off: 0 ... 20mA 

S1 (0/4mA) = on: 4 ... 20mA 

Note: See also the note regarding range selection with software parameterization. 






• Rangeability of zero point 0% and measuring span 100% 

Setting range for: zero point: -5% ... +5% of nominal measurement range (FS) 

Measuring span: 95% ... 105% of nominal measurement range (FS) 

Note: Changes to the two trimmers 0% or 100% and at S1 (0/4mA) will only be effective for the 

duration of 3 minutes after switching S2 (SW/HW) from position off to on. 

On the other hand, the software settings will only be active when S2 (SW/HW) remains in 

the off position for at least 4 seconds. 

Turning trimmer 0% or 100% in clockwise direction increases the setting value. 

Standard Settings 

The pressure transducers have the following standard parameterization: 

• Parameterization: software, S2 (SW/HW) = off 

• Current range: 4 ... 20mA 

• Zero point: 0 

• Measuring span: nominal measurement range (FS) 

• Damping: 0 

Note: Settings other than those above for the working range set at the factory must be provided with 

the order. 

Dehumidifying the Unit 

In order to dehumidify the unit, the desiccator bag supplied must be clamped under the holding bracket of the 

housing cover after removing the packing material. 

According to application conditions, the desiccator bag must be checked half yearly and replaced as 

necessary. 

Accessories 

Abbreviation Order No. 

• Overvoltage protection for MPOGxN.xxx MPZOGU 00 65 698.001 

• Branch box complete, IP65 (IP67) (NEMA4) MPZAD.002 00 65 194.001 

• Branch box IP65 (NEMA4) with 2 overvolt. prot. ASBG48 MPZAD2U.002 00 65 192.001 

• Branch box with 2 overvolt. prot. ASBG.48, IP54 (NEMA3) MPZAD2U 00 65 196.001 

• Extension cable (3-wire, schielded) MPZVK3 L 04 60 503 

• Fixing material for wall or cabinet mounting MPZBMA 00 36 108.002 

• Ventilation complete MPZLU 00 65 450.001 

• Desiccator bag 00 29 201.003 

• MPO Interface to PC MPZPCA 00 65 693.001 

(incl. MPO parameterization software MS-DOS) MPZPCS 






Note on Pneumatic Level Measurement 

The regulations for pneumatic measurement in the project handbook D 48 62 100 must be observed as well 

as the standard solution for compressed air supply with compressors D 48 39 300. 

Standard Schematic 

MPOGxN.xxx 

MPZOGU 

optional 

P 

# 

1, 4 

0V 

0V 

+V 

SB IF 

μ C 

3 2 

Iout 

+V Iout 

# 


∩

Pressure Transducer xxx bar 0/4-20mA

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