Hang-up
Hang-up refers to the process of hydrocarbon molecules being adsorbed, condensed, or by any other method removed from the sample flow prior to reaching the instrument detector. It also refers to any subsequent desorption of the molecules into the sample flow when they are assumed to be absent.
Source
40 CFR § 92.102
Scoping language
The definitions and abbreviations of subpart A of this part apply to this subpart. The following definitions and abbreviations, as well as those found in 92.132 (Calculations), also apply: