Trace analysis of impurities becomes more and more important for chemi
cal production. This concernes pollution control i. e. measuring of em
issions and immissions, as well as process and quality control. This p
aper describes the development of an analyzer system that was designed
to determine reducing trace components like CO and H-2 in process gas
es like ethene and propene. The application of the analyzer system in
process and quality control is reported.