1065.265—Nonmethane cutter.
(a) Application.
You may use a nonmethane cutter to measure CH4 with a FID analyzer. A nonmethane cutter oxidizes all nonmethane hydrocarbons to CO2 and H2 O. You may use a nonmethane cutter for raw or diluted exhaust for batch or continuous sampling.
(b) System performance.
Determine nonmethane-cutter performance as described in § 1065.365 and use the results to calculate NMHC emission in § 1065.660.
(c) Configuration.
Configure the nonmethane cutter with a bypass line if it is needed for the verification described in § 1065.365.
(d) Optimization.
You may optimize a nonmethane cutter to maximize the penetration of CH4 and the oxidation of all other hydrocarbons. You may humidify a sample and you may dilute a sample with purified air or oxygen (O2) upstream of the nonmethane cutter to optimize its performance. You must account for any sample humidification and dilution in emission calculations.