PF4 series

PF4 series Top-precision measurements in the smallest of spaces

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The PF4 series is the latest development from ROTRONIC. The thermal measurement technique enables top-precision measurements in the smallest of spaces. This differential-pressure transmitter gives ROTRONIC customers a device to measure a further important parameter in addition to devices for humidity, temperature and CO2 measurement. With the optional connector for HygroClip2 probe, analog input or temperature sensor, the device is widely supported for the most diverse applications.

ROTRONIC stands for unparalleled accuracy and long-term stability. The new differential pressure series meets these requirements with a long-term RH stability of <0.3 % /year and an accuracy of ±1.0 %.


High-precision measurement and long-term stability
Fast response time and low hysteresis
Analog signals freely configurable
Integrated relay switch contact
Large overload range
Expandable with HygroClip2 sensor or analog inputs
IP65 high immunity to dust and humidity

Dimensions129 x 72 x 45 mm
Range of application±1.0 % of full scale @ 23 °C ±3 K
InputsDifferential pressure, hose connections, 4 mm internal diameter Optional: HygroClip2 / analog input 1 Pt100 connection, 4-wire
Measuring range-25...+25 Pa / -50…+50 Pa -100...+100 Pa / -250...+250 Pa -500…+500 Pa -100...200 °C (probe-dependent) 0...100 %RH (with HC2)
Pressure dependency0.1 %/hPa
Pressure resistance2 bar (2,000 hPa)
Air flow120 - 180 μl/min
Accuracy analog output±10 mV (voltage output); ±20 μA (current output)
Switch output1 relay, Time delay, duty cycle, resetting configurable
Switching capacity<50 VAC / <75 VDC / <1 A
Power supply15…40 VDC / 14…28 VAC
Current consumption<70 mA / <150 mA (with Ethernet)
Long-term sensor stability<0.3 %/ year
Response time t 63<10 ms (only sensor element)
Alarm functionsConfigurable relay, HW4
Type of output signalsVoltage, current, digital (optional)
Analog output signal (standard)0…1 V, 0…5 V, 0…10 V, 0(4)…20 mA
Communication interfacesEthernet (optional)
Cable connections1 x M16, terminal
IP protection ratingIP65
FDA / GAMPFDA 21 CFR part 11 / GAMP5
Temperature adjustmentSingle-point
CE / EMC conform2004/108/EC

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