back to overview

PF4/5 Update

PF4/5 Update

New differential pressure transmitter series optionally with flow (PF4) or diaphragm sensor technology (PF5)

Monitoring of differential pressure is of central importance in many fields of production and vital in medical facilities. To offer customers the greatest possible flexibility, Rotronic has expanded its PF transmitter range.

Based on the PF4 V1, Rotronic has now developed a new PF4/5 series with practical new functions: an integrated ambient pressure sensor and automatic zero point calibration! For differential pressure measurement, you now have a precise and maintenance-free instrument at your disposal at all times, whose settings can be changed easily using the intuitive menu.


  • Possibility to connect an additional humidity and/or temperature probe
  • Three analog outputs for output of all measured parameters
  • Automatic zero point calibration for both sensors
  • On-board ambient pressure for automatic compensation of measurement error
  • New intuitive menu structure
  • Flow or diaphragm sensor available
  • Modbus RTU protocol
  • Integrated relay switch contact

Measurement principles:

  • In the thermal mass flow technique (with flow sensor), a heating element is placed between two temperature-sensitive resistors. A gas flow moves the temperature profile towards a resistor, which is then measured and evaluated.
  • In the diaphragm sensor strain gauge technique (DSG), a pressure strains a diaphragm. These measuring strips change their electrical resistance with each pressure pulse. The resultant elongations and compressions are then converted into an electrical signal and evaluated.