Interference-compensating NDIR Gas Sensor for Measuring Acetylene

摘要

A gas sample separated from transformer oil is circulated through an NDIR gas sensor system which obtains an acetylene concentration by calculating a detected acetylene concentration obtained by an absorption biased (“AB”) NDIR acetylene gas sensor, calculating a detected carbon dioxide concentration obtained by an AB NDIR carbon dioxide gas sensor, calculating a detected water vapor concentration obtained by an AB NDIR water vapor NDIR gas sensor and then determining the acetylene concentration from the detected acetylene concentration through use of the detected carbon dioxide and water vapor concentrations to compensate for their interference.

主权项

1. A method, comprising the steps of:
obtaining a gas sample separated from a transformer oil; circulating the gas sample through a non-dispersive infrared (“NDIR”) gas sensor system; and obtaining an acetylene concentration of the gas sample by the following steps:
calculating a detected acetylene concentration obtained by an absorption biased NDIR acetylene gas sensor of the NDIR gas sensor system;calculating a detected carbon dioxide concentration obtained by an absorption biased NDIR carbon dioxide gas sensor of the NDIR gas sensor system;calculating a detected water vapor concentration obtained by an absorption biased NDIR water vapor NDIR gas sensor of the NDIR gas sensor system; andusing the detected carbon dioxide concentration and the detected water vapor concentration to compensate for interference of carbon dioxide and water vapor present in the gas sample to determine the acetylene concentration from the detected acetylene concentration.