Process Control Instruments, Field Devices and Industrial Automation
SKU# (154)


  • Overview
  • Benefits
  • Specs
  • Documents

EH Ceraphant PTC31 Absolute and gauge pressure switch with oil-free ceramic sensor for measurement in gases or liquids. 12 to 30V DC. 100mbar to 40bar measuring cell. Threads process connection and Robust Stainless Steel housing. 4-20mA analogue or PNP switch communication.

Part# with Options:        PTC31-A1A11C1AC1A
Price with Options:        Please Email us your request for quote   


Electrical Connection
(1) Electrical Connection for EH PTC31
Power Supply & Output
(2) Power Supply & Output for EH PTC31
Measure Range & Sensor Overload Limit
(3) Measure Range & Sensor Overload Limit for EH PTC31
Calibration & Unit
(4) Calibration & Unit for EH PTC31
Process Connection
(5) Process Connection for EH PTC31
Sensor Seal
(6) Sensor Seal for EH PTC31
Additional Option
(7) Additional Option for EH PTC31

  Availability 5 Days  ]


Pressure switch for monitoring absolute and gauge pressures in gases, vapours, liquids and dust with ceramic process isolating diaphragm;

  • Finely graduated measuring ranges from vacuum to 400 bar (6000 psi)
  • Versions for use in hygienic applications
  • Electronic versions
    • one PNP switch output
    • two PNP switch outputs
    • PNP switch output with additional analog output 4...20 mA (active)
Your benefits

This compact pressure switch impresses with the latest in technology being used:

  • Integrated switching electronics for decentral and economic process monitoring and control
  • Quick and flexible process integration thanks to modular connections
  • High reproducibility and long-term stability
  • Function check and information on site thanks to LEDs and digital display
  • Ceraphire process isolating diaphragm: corrosion proof, abrasion-proof and extremely overload-resistant
  • Excellent accuracy and briefest response time right to the smallest measuring range
  • Operation and visualisation also with personal computer and ReadWin 2000 or FieldCare
  • Upper part of housing can be rotated by 310, therefore best readability of measured values in all orientations
  • DESINA compliant
  • 3A and EHEDG approved
Measuring principle

The process pressure acts on the ceramic process isolating diaphragm and the pressure-dependent change in capacitance of the ceramic sensor is measured. A microprocessor evaluates the signal and switches the output or outputs the corresponding measured value. The ceramic sensor is a dry sensor i.e. no fill fluid is needed for pressure transmission. This means that the sensor can fully support a vacuum. Extremely high durability, on a par with the material Alloy, is achieved through the use of the highly pure material Ceraphire as a ceramic.

Measuring Principle Pressure switch
Characteristic Intelligent pressure switch with ceramic, vacuum tight measuring cell, longterm stable and overload resistant
Supply voltage 12...30VDC
Reference Accuracy 0,5%
Long term stability 0,15% of URL/year
Process temperature -40C...100C
Ambient temperature -40C...85C
Measuring cell 100mbar...40bar
Max. overpressure limit 60bar (900psi)
Process connection Threads
Communication 1x PNP switch
2x PNP switch
1x PNP switch + 4...20mA analogue
Design approvals EN10204-3.1

Specialities Digital display
Robust SS-housing with Ra < 0,8 micron

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EH Ceraphant PTP31 Absolute and gauge pressure switch with welded metal sensor for measurement in gases, steam or liquids. 12 to 30V DC. 1bar to 400bar measuring cell. Threads process connection and Robust Stainless Steel housing. 4-20mA analogue or PNP switch communication. ***DISCONTINUED***