The AS 1000 series AquaSensor is a stationary, microprocessor based measurement unit for the continuous monitoring of the water saturation level and temperature in hydraulic and lubrication systems. The sensor measures the water content relative to the saturation concentration (saturation point) and output the degree of saturation (saturation level) in the range of 0 to 100% as a 4 - 20 mA signal. A reading of 0% would indicate fluid that is free of water, while a reading of 100% would indicate a fluid that is saturated with water.