PPM2 Hygrometer

As a trace moisture analyzer, the battery portable, fast responding PPM2 hygrometer uses a fundamental principle and a diffusion barrier to measure trace water vapor in gases from 0.1 to 1250 ppm; recalibration is not required under normal usage. Built to monitor dew/frost point temperature or ppm water vapor content in gases, it is configured to meet remote, spot sampling or semi-permanent absolute humidity measurement requirements. The PPM2 is ideally used for relatively clean, dry, inert gas measurement. Applications include air separation and purified gases, medical and pharmaceutical gases, and semiconductor manufacturing.

The PPM2 uses an electrolytic, phosphorus pentoxide sensor in combination with a protective, proprietary, semi permeable diffusion membrane. The principle of operation applies Faraday’s Law of Electrolysis to determine the water vapor content by measuring the dissociation current needed to electrolyze the water molecules in a gas sample.