Both the PF4 and PF5 are high-end devices which, in addition to measuring humidity and temperature, can measure a third parameter – the differential pressure. The PF4 / PF5 consistently produce perfect measurement results thanks to an integrated ambient pressure sensor. This makes it suitable for clean room, food and pharma applications. The differences between PF4 and PF5 lie in the measurement methods:
•Membrane Sensor (PF5): Has the advantage that there is no cross contamination, and no ambient pressure compensation is needed. On the other hand, it has a low overload pressure and is more sensitive to vibrations. A membrane sensor also requires a regular zero-point adjustment. Our devices have a valve built in for this purpose
•Flow Sensor (PF4): Has the advantage of a higher overload pressure and is not sensitive to vibrations. Instead, it needs ambient pressure compensation and, due to the measurement method, it has cross contamination.
The interchangeable HygroClip2 Advanced series can be connected to the PF4 / PF5 to measure humidity and temperature or, alternatively, an external PT100 to measure temperature.
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Further Info
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