SYSTEM FOR MEASURING GASES DISSOLVED IN A LIQUID

摘要

A method and apparatus for continuously monitoring and measuring the concentration of gases in a gas-containing liquid such as a transformer oil. A passive gas extractor (300) extracts via a membrane (304) dissolved gas from the liquid. The gas sensor (500) senses the concentration of a constituent gas in the extracted gas, in the presence of other constituent gases. The gas sensor (500) comprises a sample chamber (502) which receives the extracted gas, a non-dispersive infrared (IR) absorption sensing system which generates an electrical signal corresponding to the light absorption, and an electrical output comprising the electrical signal generated by the non-dispersive IR absorption sensing system. A processor (800) receives the electrical signal corresponding to the light absorption, at the one or more specified IR wavelengths, of the extracted gas in the chamber, and computes the concentration of at least one gas constituent present in the extracted gas.