Vapor Denuders - BRECHTEL 4001-115V Instrument Manual

8.6 Vapor Denuders

8.6 Vapor Denuders
The vapor denuders should be inspected regularly for particle build-up and the surfaces
must be rejuvenated when they become saturated. Rejuvenation of the surfaces may be
indicated by higher background chemical species concentrations in the PILS liquid sam-
ple, especially during filtered air sampling.
The inorganic vapors denuder rejuvenation scheme is described in the maintenance sec-
tion. The organic vapor denuder contains 15 carbon impregnated paper strips that should
be removed and replaced with new strips about once per year. Apply new vacuum grease
to the Oring in the organic vapor denuder when replacing the carbon strips.
83-00009-01A PILS 4001-115V and 4001-230V Page 60 of 74