[Code of Federal Regulations]
[Title 40, Volume 31]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR1065.250]

[Page 708-709]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 1065_ENGINE-TESTING PROCEDURES--Table of Contents
 
                    Subpart C_Measurement Instruments
 
Sec.  1065.250  Nondispersive infra-red analyzer.

    (a) Application. Use a nondispersive infra-red (NDIR) analyzer to 
measure CO and CO2 concentrations in raw or diluted exhaust 
for either batch or continuous sampling.
    (b) Component requirements. We recommend that you use an NDIR 
analyzer that meets the specifications in

[[Page 709]]

Table 1 of Sec.  1065.205. Note that your NDIR-based system must meet 
the calibration and verifications in Sec.  1065.350 and Sec.  1065.355 
and it must also meet the linearity verification in Sec.  1065.307. You 
may use an NDIR analyzer that has compensation algorithms that are 
functions of other gaseous measurements and the engine's known or 
assumed fuel properties. The target value for any compensation algorithm 
is 0.0% (that is, no bias high and no bias low), regardless of the 
uncompensated signal's bias.

                        Hydrocarbon Measurements