The calibrateable on-wall humidity and temperature sensor HYGRASGARD® AFTF-20 is designed as a robust industry version with steel sinter filter, measuring the relative humidity and temperature of air in accuracy class ± 2 % r.H. The transmitter converts the measurands into standard signals of 0 – 10 V or 4...20 mA and is optionally available with or without display. It is used in non-aggressive dust-free ambiences in refrigeration, air conditioning, ventilation and clean room technology, and as outdoor humidity and temperature sensor. Relative humidity (in % r.H.) is the quotient of water vapour partial pressure divided by the saturation vapour pressure at the respective gas temperature. These measuring transducers are designed for exact detection of humidity. A digital long-term stable sensor is used as measuring element for humidity measurement. Fine adjustment by the user is possible.

On-wall (outdoor) humidity and temperature measuring transducers HYGRASGARD® AFTF-20: