“The analyzer is based on an electronically flow controlled flame ionization detector (FID) and an oxidation catalyst that is switched in and out of a portion of the sample stream.  Total hydrocarbons are measured first, and then the oxidizer switches in.  The catalyst oxidizes all hydrocarbons except methane, for a methane measurement.  The methane value is then automatically subtracted from the total hydrocarbon concentration to determine the nonmethane hydrocarbon reading.”  The Model 9000 NMHC can be configured with internal components for a single or multipoint analysis of non-condensing gas samples.”