Fischer DE25 – Digital, low pressure DP Transmitter – Air, Gases

Fischer DE25 is high accuracy, low range negative or positive pressure or differential pressure for air, clean gases and vapours. It is suitable for wall, space or duct mounting. It is 3-wire pressure transmitter.

It is suitable for application in building, HVAC, pharma, biotechnology, clean room, medical, datacentre etc.


Fischer DE25 – Digital Air DP Transmitterpdf-image

very low pressure differential transmitter for air, clean gases
Make: Fischer Messtechnik (Germany)
Model: DE25

Fischer DE25 is digital, high accuracy, low pressure range differential pressure transmitter with 3-wire electrical output interface.

It is suitable for low positive and negative gauge pressure or differential pressure of air and clean gaseous application.


Fischer DE25 - digital Air differential pressure transmitter
Fischer DE25 – digital Air differential pressure transmitter

Working Principle:

DE25 is based on piezo-resistive sensor element and can measure positive gauge, negative gauge or differential pressure of air, clean & dust-free gases and vapours.

The pressure is measured directly by piezo-resistive bridge that is formed on the surface of an internal silicon diaphragm.

Pressure changes cause change in resistance. Inbuilt microcontroller based electronic, then translate this change in resistance to voltage or current signal output via D/A converter.

Key Features:

  • Very low pressure measurable without long-term drift
  • Rugged design
  • High sensitivity and resolution
  • IP65 protected
  • Over pressure protected

Key Specifications:

  • Measuring range: 0 ~ 2.5 mbar up to 0 ~ 100 mbar
  • Maximum static operating pressure: 50 bar to 500 mbar (depending upon measuring range)
  • Burst pressure: 1.5x maximum static operating pressure
  • Hysteresis: +/- 0.2% full scale
  • Linearity: Straight line error (max.): +/- 1.0% Full scale
  • Pressure connection: threaded connections of aluminum for 6/4 mm
  • Operating ambient & media temperature: -10° C to +50° C
  • Protection class: IP65 per DIN EN 60529
  • Electrical output: 4-20mA / 0-10V linear, 3 – wire
  • Power supply: 24 V DC/ AC
  • Material, housing: Polyamide PA 6.6, polycarbonate PC
  • Materials, media contact: Silicon, glass reinforced polyester, aluminum, NBR

Application areas:

  • Filter status / condition monitoring
  • Precision air duct measurement
  • Clean room pressure balance monitoring
  • Plant and mechanical engineering

Industrial areas:

  • Air conditioning and ventilation systems
  • Auditorium, office, conference rooms
  • HVAC and ventilation application
  • Environment monitoring
  • Clean room and laboratory rooms