PF4/5 Differential-Pressure Transmitter

Brand: Rotronic Instrument Corp.

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.
Features
  • 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 

Specifications

Long-term stability

  • PF4: ± 0.05 % FSS/year (Typical) / ± 0.1 % FSS/year (max.) PF5: ± 0.25 % FSS (Typical) per year @ ± 250 and ± 500 Pa measurement range ± 0.3125 % FSS (Typical) per year @ ± 100 Pa measurement range ± 0.625 % FSS (Typical) per year @ ± 50 Pa measurement range ± 1.25 % FSS (Typical

Response time t 63

  • < 1 s, typical

Dimensions

  • 129 mm × 72 mm × 45 mm

Display type

  • Color TFT display

Fire protection class

  • Complies UL94-HB

Min. / max. load voltage / current signal

  • > 1 kΩ/V (voltage output) / 1 kΩ/V (voltage output) / 1 kΩ/V (voltage output) / 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

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 % Full Scale/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

  • Heating, Ventilation, Air-Conditioning Technology
  • Food Industry
  • Pharmaceutical Sector
  • Clean Rooms

Documentation

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