CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS (Parts 50–99) > PART 86—CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND ENGINES > SUBPART D—Emission Regulations for New Gasoline-Fueled and Diesel-Fueled Heavy-Duty Engines; Gaseous Exhaust Test Procedures (§86.301-79 to §86.348-79) > 86.322-79—NDIR CO2 rejection ratio check.

86.322-79—NDIR CO2 rejection ratio check.

(a) Zero and span the analyzer on the lowest range that will be used.

(b) Introduce a CO2 calibration gas of at least 10 percent CO2 or greater to the analyzer.

(c) Record the CO2 calibration gas concentration in ppm.

(d) Record the analyzers' response (AR) in ppm to the CO2 calibration gas.

(e) Calculate the CO2 rejection ratio (CO2 RR) from:

Code of Federal Regulations

CO2 RR = (ppm CO2)/AR