Moisture measurement in air and oil
Water is generally not wanted in hydraulic liquids and lubricants. High concentrations of water can seriously affect operation or even cause damage.
The sensor measures the relative humidity in the oil and the air in the range of 0...100 % by means of a capacitive measuring element. At 0 % the oil is absolutely without any water content. At 100 %, however, the medium is completely saturated. No more water is dissolved and is then present as free water. Besides the relative humidity the sensor also outputs the medium temperature as an analogue signal.