The RRFT(P)/A humidity and temperature transducer with pendulum sensor registers the temperature and, optionally, the relative humidity, absolute humidity, the mixing ratio or the dew point of the air in the environment and converts this measured value into a linear output signal 0-10 V respectively 4-20 mA.As an option the device has a potential-free changeover contact and a backlit display.The changeover contact can be defined for one of the two measured values.The display content can be rotated in 90° steps using a menu and the measured value, the switching threshold set, the state of the respective relay, the MIN/MAX measured values for the selected intervals (1 h / 6 h / 12 h / 24 h) etc. can be read out. The value measured in addition to the temperature can be selected from the 4 parameters % r.h., g/m³, g/kg, dp can easily be selected per DIP switch.In addition the humidity measuring device has a heating function to protect the sensor at high humidity 95…99% r.h.. If the relative humidity exceeds the threshold value set ex-works for a certain period of time the heating function is activated. The sensor is heated for a limited time and thus dried and protected against condensation. During the heating and the subsequent temperature balancing phase the output signal is kept stable at the last measured value before the heating function was triggered.The humidity and temperature sensor is very well protected against contamination by a screwable sintered filter and can, if required, be finely calibrated in situ using an offset controller.