§ 86.1544-84 - Calculation; idle exhaust emissions.

Link to an amendment published at 73 FR 38194, June 30, 2008.

(a) The final idle emission test results shall be reported as percent for carbon monoxide on a dry basis.

(b) If a CVS sampling system is used, the following procedure shall apply:

(1) Use the procedures, as applicable, in 40 CFR 1065.650 to determine the dilute wet-basis CO and CO2 in percent.

(2) Use the procedure, as applicable, in 40 CFR 1065.650 to determine the raw dry-basis CO2 in percent.

(3) Convert the raw dry-basis CO2 to raw wet-basis. An assumption that the percent of water by volume in the raw sample is equal to the percent of raw dry-basis CO2 minus 0.5 percent is acceptable. For example:

10.0% dry CO2−0.5%=9.5% water (1.00−0.095) (10.0% dry CO2)=9.05% wet CO2

(4) Calculate the CVS dilution factor (DF) by:

$ER06OC93.138$

(5) Convert the dilute wet-basis CO to dilute dry-basis values. An assumption that the percent of water by volume in the sample bag is 2 percent is acceptable. For example:

Dilute dry CO=(dilute wet CO)/(1.00-0.02)

(6) Calculate the raw dry-basis CO values by:

Raw dry CO=(DF) (dilute dry CO)

(c) If the raw exhaust sampling and analysis system specified in 40 CFR part 1065 is used, the percent for carbon monoxide on a dry basis shall be calculated using the procedure, as applicable, in 40 CFR 1065.650.

Effective Date Note:

At 73 FR 37194, June 30, 2008, § 86.1544-84 was redesignated as § 86.1544, effective July 7, 2008.