PF4 - Differential-Pressure Transmitter

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 stability of <0.3 %/year and an accuracy of ±1.0 % of full scale.

The ROTRONIC differential-pressure transmitters are ideal for clean rooms, operating rooms and applications where even minor differences in pressure can have a big effect.

• 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 analogue inputs
• High immunity to dust and humidity in the medium

Range of application 0...70 °C / 0…90 %rh; 0...60 °C / 0…90 %rh with display
Accuracy at 23 ±5 °C ±1.0 % of full scale @ 23 °C ±3 K
Inputs Differential 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 dependency 0.1 %/hPa
Pressure resistance 2 bar (2'000 hPa)
Air flow 120 - 180 μl/min
Accuracy analog output ±10 mV (voltage output); ±20 μA (current output)
Switch output 1 relay, Time delay, duty cycle, resetting configurable
Switching capacity <50 VAC / <75 VDC / <1 A
Power supply 15…40 VDC / 14…28 VAC
Current consumption <70 mA / <150 mA (with Ethernet)
Long-term stability Typ. ±0.3 %/year
Response time t 63 <10 ms (only sensor element)
Alarm functions Configurable relay, HW4
Type of output signals Voltage, current, digital (optional)
Analog output signal (standard) 0…1 V, 0…5 V, 0…10 V, 0(4)…20 mA
Communication interfaces Ethernet (optional)
Housing ABS
Cable connections 1 x M16, terminal
IP protection rating IP65
FDA / GAMP FDA 21 CFR part 11 / GAMP5
Temperature adjustment Single-point
CE / EMC conform 2004/108/EC
Dimensions 129 x 72 x 45 mm
Weight 240 g

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