Fig. 1A. An HP 6890 Gas Chromatograph, equipped with an FID for
rapid determination of hydrocarbons C1, C2,
C3, and C3+.
Fig. 1B. An HP 6890 Gas Chromatograph (GC), equipped with an FID for
determination of hydrocarbons up to C7. This GC (NGA) also
has a TCD for determination of nonhydrocarbon gases.