How It Works

The dew point sensor is a “dielectric ceramic” that varies its electrical capacitance with changes in relative humidity.  The sensor is mounted in a short probe, which is installed in a T-fitting that allows the sample gas to flow past the sensor.  The tip of this probe contains the dielectric ceramic relative humidity (RH) sensor, as well as a built in temperature sensor to determine its dry bulb temperature.  Information from both of these sensors is used to compute the resultant dew point.