Dew point sensor
The FAS-SW is a sorption-type, aluminum oxide sensor designed to measure the water dew point over a wide temperature range at an operating pressure of up to 300 bar. Measurement results are then transmitted to the upper level via 4 … 20mA analog output.

The FAS-SW is designed to measure the water dew point in inert and aggressive gases, including those containing hydrogen. It can be used for a wide variety of applications, where the use of a sorption-type aluminum-oxide sensor is preferred to a condensation hygrometer. Areas of application include technological processes in the chemical and petrochemical industries, natural gas processing, and metallurgy. The FAS-SW is equally well-suited for applications in mechanical engineering, microelectronics, and the energy industry.


  • Wide measurement range
  • Calibration range down to -100 °C without approximation, at pressures of <= 300 bar.
  • Quick response time when measuring trace moisture in the range -60 … -100 °C (using a special sorbent)
  • Temperature compensation over a wide temperature range

Technical specifications

Measurement range, °C-100 … +20
Measurement range (metrological), °CRange I: -70 … +20
Range II: -100 … +20 
Accuracy, °CRange -70 °c … +20 °C  : ±2.0
Range -100 °C … -70 °C : ±3.0
Operating pressure, max, bar300
Sample gas flow rate, NI/min0.5 … 5
Sample probe temperature, °C-40 … +60
Data Interface4 … 20 MA
Power supply, VDC20 … 27
Power consumption, W, max0.5
IP degree of protectionIP66/67
Explosion protection rating1 Ex ib IIC T6 Gb
Operating requirement: Ambient temperature, °C-40 … +70
Dimensions, mm120x30x30
Weight, kg, max. (including measurement chamber)0.2

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