(a) Dilute engine exhaust, and use batch sampling to collect proportional flow-weighted dilute samples of the applicable alcohols and carbonyls. You may not use raw sampling for alcohols and carbonyls.
CFR 40-1065.805-2014 history
2014CFR 40-1065.805-2014 Protection of Environment. Part1065:Engine-testing procedures. Section1065.805:Sampling system.