[Code of Federal Regulations]

[Title 40, Volume 31]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR1065.260]



[Page 708]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 1065_ENGINE-TESTING PROCEDURES--Table of Contents

 

                    Subpart C_Measurement Instruments

 

Sec.  1065.260  Flame-ionization detector.



    (a) Application. Use a flame-ionization detector (FID) analyzer to 

measure hydrocarbon concentrations in raw or diluted exhaust for either 

batch or continuous sampling. Determine hydrocarbon concentrations on a 

carbon number basis of one, C1. Determine methane and 

nonmethane hydrocarbon values as described in paragraph (e) of this 

section. See subpart I of this part for special provisions that apply to 

measuring hydrocarbons when testing with oxygenated fuels.

    (b) Component requirements. We recommend that you use a FID analyzer 

that meets the specifications in Table 1 of Sec.  1065.205. Note that 

your FID-based system for measuring THC, THCE, or CH4 must 

meet all of the verifications for hydrocarbon measurement in subpart D 

of this part, and it must also meet the linearity verification in Sec.  

1065.307. You may use a FID 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.

    (c) Heated FID analyzers. For diesel-fueled engines, two-stroke 

spark-ignition engines, and four-stroke spark-ignition engines below 19 

kW, you must use heated FID analyzers that maintain all surfaces that 

are exposed to emissions at a temperature of (191 11) [deg]C.

    (d) FID fuel and burner air. Use FID fuel and burner air that meet 

the specifications of Sec.  1065.750. Do not allow the FID fuel and 

burner air to mix before entering the FID analyzer to ensure that the 

FID analyzer operates with a diffusion flame and not a premixed flame.

    (e) Methane. FID analyzers measure total hydrocarbons (THC). To 

determine nonmethane hydrocarbons (NMHC), quantify methane, 

CH4, either with a nonmethane cutter and a FID analyzer as 

described in Sec.  1065.265, or with a gas chromatograph as described in 

Sec.  1065.267. Instead of measuring methane, you may assume that 2% of 

measured total hydrocarbons is methane, as described in Sec.  1065.660. 

For a FID analyzer used to determine NMHC, determine its response factor 

to CH4, RFCH4, as described in Sec.  1065.360. Note that 

NMHC-related calculations are described in Sec.  1065.660.