Hengesbach Flush-mounted Pressure Transmitter and Switch PiezoSwitchPS Type


The pressure transmitter PiezoSwitch is well suited for measuring absolut and relativ pressure of fluids and gases in pipelines with temperature ranges from -40°C bis 125°C. Two available switch outputs enable the switching functions. The flush-mounted processconnection PZM-type with o-ring-sealing and stainless steel diaphragm is certified EHEDG Type EL-ASEPTIC CLASS 1. It is ideal for measurements with highest hygienic demands and prescriptions. The PZM-Type connection comes with a wide range of adapters and reduces sustainably the cost of operation.

For applications without any elastomer-gaskets the metallicaly sealing and adjustable version K3 can be used. The housing of the PiezoSwitch is complete of hygienic design. The pressure transmitter is resistant against overload of pressure and temperature and against CIP- and SIP applications. The sensor measuring range of the piezoresistive and vacuum-tight sensor with stainless steel diaphragm is from -1/0…1bar up to -1/0…30bar.


  • Signaloutput 4…20mA, 2-L
  • UP to 2 PNP-Switchoutputs, 24V DC, max. 50mA, with indication
  • LED-Display to show actual measured value
  • simple operation with 3 buttons only: menu supported configuration of measuring range and switchpoints directly on the unit
  • Measuring ranges from -1/0…30bar, free programmable, with TurnDown 4
  • Process connection: G1″ with sealing conus, with unionnut, without elastomers, adjustable. Alternativly EHEDG EL-ASEPTIC certified modular system type PZM with more than 8 different process adapters and welding sockets


General details
Device type / measuring principle PiezoSwitch PS / piezoresistive
Measuring ranges [bar] Relative -1/0…1 -1/0…2,5 -1/0…5 -1/0…10 -1/0…30
Absolute 0…1 0…2,5 0…5 0…10 0…30
Overload protection 3 8 15 30 90
Setting the measuring ranges with 3 keys within the transmitter
Setting ranges Measuring range begin zero : 0…..75% of the sensor’s nominal measuring span
Measuring span span : 25…100%   of the sensor’s nominal measuring span
Turndown (TD) : 4
Burst pressure DIN16086 ≥ 4-fold nominal pressure range
Output signal 2-wire: 4…20mA
Fault signal 22mA
Current limitation 21mA
Signal range 3,8…20,5mA acc. Namur NE43
Switch output 2x PNP, max. 50mA
Measuring accuracy
Reference conditions acc. DIN IEC 770
Linearity, hysteresis and repeatability as per the limit point method ≤ ± 0,5% of the sensor’s nominal measuring range
Activation time < 2s (the device will carry out a self-test)
Setting time < 1s
Long-time drift ≤ 0,2% of the span per year
Thermal hysteresis ≤ ± 0,2% of the sensor’s nominal measuring range / 10K (+20…+80°C) from 10…30bar
≤ ± 0,3% of the sensor’s nominal measuring range
Conditions of use
Installation position / calibration position Any position / standing vertically
Medium temperature -40…+125°C / 140°C 1 h
Ambient storage temperature -10…+85°C (below -20°C danger of cable breakage)
Protection class acc. to EN60529 IP 67 and IP 69K
Electromagnetic compatibility acc. to EN 61326-1
Electrical connection Round plug-in connector M12x1, 5-pole, nickel-plated brass (stainless steel available on request)
Process connection – Membrane, flush-welded, CrNiSt
– EHEDG Typ EL-ASEPTIC CLASS 1 certified connection system PZM with press screw M38x1.5 and elastomer sealing
– Process seal EPM (FDA-conform) (range -20…+150°C)
– G1“ with metallic sealing conus and union nut, adjustable (K3)
Materials – Field housing / lid: CrNiSt 1.4301 (304)
– Housing seal: FPM (Viton®)
– Pressure compensation element: Polyamide
– Process connection / connection adapter: CrNiSt 1.4404 (316L)
– Process membrane: CrNiSt 1.4435/1.4404 (316L)
Filling fluid Silicon oil (FDA)
Display and operation
Display 4 units 7-segment display incl. decimal point, 2x status LED for switch point
Operation 3-key concept
Auxiliary energy resources
Power supply / burden 24…30V DC, max. burden: 600 Ω
Accessories PiezoSwitch PS
Certificates Declaration of conformity
Material certificates acc. EN 10204 (on request)
EHEDG-Certifikate (on request)

Download Data Sheet: Flush-mounted Pressure Transmitter and Switch PiezoSwitchPS Type

Ref: Hengesbach.com

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