Patent ID: 8178832

Claim:
A method useful with a dual-beam non-dispersive infrared (“NDIR”) gas sensor having a sample chamber used to detect a sample gas, comprising: using a calibration curve of the NDIR gas sensor to calculate a first concentration of the sample gas in the sample chamber of the NDIR gas sensor; using a secondary gas standard to determine a second gas concentration of the sample gas; and recalibrating the NDIR gas sensor to create a recalibrated gas sensor by using the second gas concentration and a reversed calibration curve algorithm which adjusts the sensor measurement component to correct for a difference between the first concentration and the second gas concentration when the difference exceeds a preselected threshold; wherein the NDIR gas sensor has no moving parts for effecting the interposition of a plurality of spectral filters or an absorbing cell or a non-absorbing cell to create both a signal channel and a reference channel; and wherein the calibration curve is based upon a combination of a physics measurement component of the NDIR gas sensor and a sensor measurement component of the NDIR gas sensor.