(a) A propane check serves as a CVS verification to determine if there is adiscrepancy in measured values of diluted exhaust flow. You may use the same procedure to verify PFDs and batch samplers. For purposes of PFD and batch sampler verification, read the term CVS to mean PFD or batch sampler as appropriate. A propane check also serves as a batch-sampler verification to determine if there is adiscrepancy in a batch sampling system that extracts a sample from a CVS, as described in paragraph (g) of this section. Using good engineering judgment and safe practices, this check may be performed using a gas other than propane, such as CO2 or CO. A failed propane check might indicate one or more problems that may requirecorrective action, as follows:
CFR 40-1065.341-2014 history
2014CFR 40-1065.341-2014 Protection of Environment. Part1065:Engine-testing procedures. Section1065.341:CVS, PFD, and batch sampler verification (propane check).