Differential Pressure - Measurement and Monitoring of Differential Pressure

PF4/5 Differential-Pressure Transmitter

The new differential pressure transmitters PF4 and PF5 with two different sensor technologies (thermal measuring method in PF4 and diaphragm sensor in PF5) consistently produce perfect measurement results thanks to an integrated ambient pressure sensor. Both sensors are equipped with automatic zero point compensation. In the PF4, this is carried out automatically every 5 ms in the sensor, in the PF5 automatic compensation is performed with the help of an internal valve and programming in the HW4 V3.9.0. Both instruments can also be ordered with a HygroClip2 connection or a B4 connector for PT100. The new color display allows users to display up to 4 lines and a maximum of 3 measured values. All analog outputs, inputs and alarm settings can be changed via the intuitive menu. Thanks to analog and digital communication, both device types can be integrated easily into any monitoring system.


  • Flow or diaphragm differential pressure sensors
  • 1 to 3 analog outputs, 1 analog input
  • Network-compatible (Ethernet)
  • Modbus capable TCP or RTU via RS485
  • Potential-free relay with changeover contacts 

Use cases

  • Heating, ventilation, air-conditioning technology
  • food industry
  • pharmaceutical sector
  • clean rooms
More Information
Long-term stability PF4: ±0.05 % FSS/year (typ.) / ±0.1 % FSS/year (max.) PF5: ±0.25 % FSS (typ.) per year @ ±250 and ±500 Pa measurement range ±0.3125 % FSS (typ.) per year @ ±100 Pa measurement range ±0.625 % FSS (typ.) per year @ ±50 Pa measurement range ±1.25 % FSS (typ.
Response time t 63 < 1 s, typical
Dimensions 129 mm x 72 mm x 45 mm
Display type Color TFT display
Fire protection class Complies UL94-HB
Min. / max. load voltage / current signal > 1 kΩ/V (voltage output) / < 500 Ω (current output)
Weight 243 g with display & Ethernet
Housing ABS
Power supply 18…48 VDC / 16…35 VAC, (galvanically isolated), Optional: Power over Ethernet
Evaluation software / Compatibility ROTRONIC HW4 V3.9
Switch output 1 relay potential-free change-over switch (NC - COM - NO)
Switching capacity 30 VDC/1 A or 35 VAC/1 A
Pressure resistance PF4: 5 bar, PF5: 0.7 bar
Accuracy ±1 hPa (0…65 °C; 950…1100 hPa) max.
Resolution 0 to 1 V 13 bit, otherwise 16 bit
Mounting Wall Mounting
Electrical connections Screw terminals in housing
Measurement range PF4: ±10 Pa / ±25 Pa / ±50 Pa / ±100 Pa / ±250 Pa / ±500 Pa
PF5: ±25 Pa / ±50 Pa / ±100 Pa / ±250 Pa / ±500 Pa
Analog outputs Min. 1, max. 3, freely configurable
Maximum altitude 2000 m ASL
Sensor type PF4: Flow Sensor / PF5: Diaphragm Sensor
Zero point compensation PF4: Automatic, every 5 ms in the sensor, PF5: Automatic, configurable via HW4
IP protection class IP65 (without Ethernet) / IP40 (with Ethernet)
Influence line resistance RTD/resistance 3-wire ±0.05 %FS/Ω
Rated current consumption <300 mA @ 24 VDC
Digital communication Ethernet (TCP) / RS-485 (Modbus RTU)
Analog output type 0...1 V, 0...5 V, 0...10 V, 0...20 mA, 4...20 mA
Analog output accuracy (@ 23 °C) Voltage output: ±1 mV/V Current output: ±20 μA
Analog input 1, freely configurable
Analog input type 0…10 V, input resistance >50 k 0…24 mA, measurement resistance 412.5 Ω
Ambient pressure dependence PF4: Compensated, PF5: None
Working range - pressure 300…1100 hPa
Working range - temperature -5...65 °C

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