The calibrateable room humidity sensor HYGRASGARD® RFF measures the relative humidity of air. It converts the measurand humidity into standard signals of 0 - 10 V or 4...20 mA and is optional available with or without display, with plastic or with stainless steel enclosures. It is used in non-aggressive dust-free ambiences in refrigeration, air conditioning, ventilation and clean room technology, in residential rooms, offices, hotels, technical rooms, meeting rooms and convention centres. 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