Pressure Measurement

Pressure Transducer / Transmitter

Model PTM

sts model PTM pressure transducer transmitter


STS Model PTM is a pressure transducer / transmitter with pressure range of up to 1000 bar. It contains a Wheatstone bridge which is essentially a divided bridge circuit used for the measurement of static or dynamic electrical resistance. The output voltage of the Wheatstone bridge is expressed in millivolts output per volt input. The Wheatstone circuit is also well suited for temperature compensation.

  • Model PTM Pressure Transducer has a piezoresistive measuring element
  • Adjustable 1:4 of the nominal range within -5% to +105% FS
  • All pressure ranges between 0…50 mBar and -1…1000 bar available
  • Pressure units adjustable
  • Re-calibration function for zero and span
  • Adjustable time delay
  • Reverse polarity and short circuit protected
  • Interface RS485 (MODBUS) Output: pressure and temperature
  • Active compensated (option) – Digital temperature compensated
STS Model PTM is used in the following applications:
  • Industrial Measurement
  • Process & Control
  • Food & Beverage
  • Hydraulic Test benches

Technical Details

Pressure Range (Bar)0.1…0.5>0.5~2>2~25>25~600>600~1000
Overpressure3 bar3 x FS (Minimal 3 bar)3 x FS3 x FS (Maximum 850 bar, optional to 1500 bar)1500 bar
Burst Pressure>200 bar>200 bar>200 bar>850 bar
(Optional to 1500 bar)
>1500 bar

Thermal Shift [± % FS/°C]

(0~70°C)≤0.06 (4)≤0.03≤0.015≤0.015≤0.015
(-25~85°C)≤0.08 (5)≤0.04≤0.02≤0.02≤0.02
Active Compensated
[Z+S] (-10~50°C)≤0.01/0.015≤0.01/0.015≤0.01/0.015≤0.01/0.015≤0.01/0.015
[Typ./Max.] (-25~85°C)≤0.015/0.02≤0.015/0.02≤0.015/0.02≤0.015/0.02≤0.015/0.02
Accuracy (1)≤ ± 0.25 % FS
≤ ± 0.1 % FS, ≥ 500 mbar
≤ ± 0.1 % FS, activ compensated (option)

Electrical Specifications

Supply VoltageRange: 9…30 V DC
Supply voltage influence: <0.1 % FS
Analog OutputStandard: RS485 (pressure) and 4…20mA (pressure)
Activ compensated: RS485 (pressure and temperature) and 4…20mA (pressure and temperature)
Resolution: ≤ ± 0.025 % (analog output), ± 0.01 % (digital output)
Output at 4 mA: adjustable between -5% FS …105 % FS
Output at 20 mA: adjustable between -5% FS… 105 % FS
Span: adjustable between 25% FS…110% FS, min. 50 mbar
Adjustable time delay: 100 ms, 1 s, 10 s, (standard approx. 30 ms)
Temperature output (precision): ± 1°C
Load ResistanceRL = UB [V] – 6V / 0.02A, 1 kOhm max.
Load Resistance Influence<0.1 % FS
ProtocolMODBUS, Layer 7
Interface (3)VART199 incl. PC-Program (VART244)


Process Connection, Diaphragm, HousingStainless steel 1.4435 (316L) other materials (e.g. titanium) on request
Seals (Standard)Viton (other materials see ordering code)

Electromagnetic Compatibility

StandardLevelTypical Interferences


EN 61000-6-3Generic emission standard
EN 55022Emission, class B


EN 61000-6-2Generic immunity 
EN 61000-4-2Electrostatic discharge4kV contact, 8kV air  
EN 61000-4-3Radiated electro-magnetic field10V/m, 80-1000 MHz, 80% AM 1kHzCellular phones, radio sets 
EN 61000-4-3Radiated electro-magnetic field (GSM)10V/m, 950 MHz, 200Hz on/offDigital portable phones 
EN 61000-4-4Fast transients (burst)2 kVMotors, valves 
EN 61000-4-6Conducted radio-frequency10V, 0.15-80 MHz, 80% AM 1kHzCellular phones, radio sets 
EN 61000-4-5Surge10 kA (8/20 μs) (2)Lightning strikes 

(1) Zero based non-conformity according to DIN 16086, including hysteresis and repeatability
(2) Only with optional surge (lightning) protection
(3) Interface not included
(4) 50 – 99 mbar: ≤ 0.12
(5) 50 – 99 mbar: ≤ 0.16
Note: Specification are subject to change without noitce.