Hengesbach Pressure and Level Transmitter PZM/VRM 200/201


The digital pressure and level transmitters PIEZOMESS PZM / VARIMESS VRM - Series 200, with their O-ring seals, are suitable for pressure and level measurements without dead spaces, under strict cleanliness conditions, as well as for viscous and crystallising media. They have a modular, flush-mounted connection concept with various adaptors. 

The PIEZOMESS PZM / VARIMESS VRM - Series 100 consists of one basic device, which can be combined with various application-specific adaptors, e.g. welding sockets, DRD, VARIVENT, DIN 11851, Clamp, Flange DIN, etc. In combination with the advantages of digital electronics, e.g. a large measuring range and on-site adjustability, this concept results in clearly reduced storage space and spare parts and thus to a cost reduction in materials administration. During operation, various pressure units can be shown on the local display (OPUS), along with the sensor temperature as a secondary process indicator. The display and operating module has either been integrated into the field housing or is available as an external housing with a plug connection. 


  • High precision ≤ ± 0,05% FS, turn down 10, vacuum safe
  • Further scope of functions thanks to programmability
  • Optional with HART® protocol
  • Tank linearisation for standard tank shapes and special designs thanks to volumetric measurement with OPUSi
  • Diagnosis function for monitoring of devices
  • Copying of device parameters with easy transfer
  • Integrated on-site display or external OPUSi display and operating module for parametrisation and display of measuring values
  • Application strenght: highly precise measurement of content pressurised tanks / vacuum measurements with high temperatures
  • EHEDG-aseptic certified modular process connection system


General details

Device type / measuring principlePZM 200/201/200H/201H: piezoresistive   
 VRM 200/201/200H/201H: capacitive   


Measuring ranges PZM 200/201/200H/201H  
Standard nominal measuring ranges [bar]relativeOPabsoluteOP
OP = overload protection [bar]-1/0...0.351  
Special measuring ranges -1/0...5150...515
All measuring cells are vacuum-proof    
Setting the measuring rangesVia the keypad of the OPUSi display and operating module / via the integrated on-site display   
 Optional: via HART® (for the range of functions see the operating instructions)   
Setting rangesStart the measuring zero:0...90%of the sensor's nominal measuring spanTD=10
 Measuring span span:10...100%of the sensor's nominal measuring span 
Burst pressure DIN16086≥ 4-fold measuring range   


Output signal2-wire:   4...20mA with a test circuit connection in the device   
 Optional: 4...20mA HART®   
Fault signalOptional: 3.8mA, 22mA, hold (i.e. holding the last value)   
Current limitation3.85mA and 21.5mA (normal operation)   
Integration timeContinuously selectable between 0 and 300s (setting time after a pressure leap)   

Measuring accuracy

Reference conditionsacc. to DIN IEC 770   
Linearity, hysteresis and repeata bility as per the limit point method DIN IEC 770≤ ± 0.05% of the sensor's nominal measuring range   
Activation time< 5s (the device will carry out a self-test.)   
Setting time (without damping)< 200ms   
Long-time drift≤ 0.2% of the span per year   
Thermal hysteresis≤ ± 0.75% beginning of the measuring range / ≤ ± 0.8% end of the measuring range (VRM)   
≤ ± 0.2% of the sensor's nominal measuring range / 10K (-20 to +80°C) from 4bar (PZM)
≤ ± 0.3% of the sensor's nominal measuring range / 10K (-20 to +80°C) up to 0.6bar (PZM)

Conditions of use

Installation position / calibration positionAny position / standing vertically   
Medium temperaturePZM:T1:-40...+125°C (140°C over one hour at the most) 
  T2:-40...+200°C (high-temperature version) 
 VRM: -40...+140°C 
Ambient storage temperatureType 201/201H:-40...+85°C  
 Type 200/200H:-30...+75°C  
 (Below -20°C cable breakage might occur and the display's function may be impaired.)   
Protection class acc. to EN60529IP 67 and IP 69K   
Electromagnetic compatibilitySensitivity against interference:acc. to DIN IEC 61000-6-2  
 Interference radiation:acc. to DIN IEC 61000-6-4  

Download Data Sheet: Pressure and Level Transmitter PZM/VRM 200/201

Ref: hengesbach.com