Relative Humidity System – Sartrex

The Sartrex Relative Humidity System is designed to measure the moisture content in the gases from eight different process lines in the range of -40C to +10C. The direct measurement of water vapor pressure in each process line is accomplished by using the Panametrics M series aluminum oxide moisture sensor and Panametrics Moisture Target Series 5 hygrometer (Transmitter / Signal conditioner).
The sensor (M series) consists of an aluminum strip which is anodized by a special process to provide a porous oxide layer over which a very thin coating of gold is evaporated. The aluminum base and the gold layer form the two electrodes of what is essentially an aluminum oxide capacitor.