A system for the retrieval and initial conditioning of sample gas for "on
line" analyzers or filling of gas sample cylinders. The preferred
embodiment of the present invention contemplates a system configured to
obtain a representative gas phase sample from a process gas containing
entrained liquid, or a process gas which generally is highly susceptible
to partial condensation of some gas phase components. The preferred
embodiment of the present invention teaches an assembly including a phase
separation membrane and housing configured to facilitate the removal of
entrained liquid from a sample gas stream. Accuracy of the sample is
enhanced, and compositional changes are avoided by first extracting a
sample from the process gas followed by removal of entrained liquid it may
contain, with the entrained liquid removal being conducted at the
prevailing process gas pressure and temperature. Thereafter the liquid
free sample may be desaturated by lowering its pressure to reduce its
susceptibility to condensation.
