Mode Of Operation - RMG PGC 9300 Operating Manual

3 Gas chromatograph PGC 9300

3.2 Mode of operation

A gas sample is taken from the process line with a sampling probe. Filtration and
pressure reduction take place in an inlet pressure regulating unit before the sam-
ple is delivered to the measuring element. An optional gas dryer can be provided.
Figure 4: Gas chromatograph block diagram shows the typical layout of the chro-
31
matograph in a block diagram.
Figure 4: Gas chromatograph block diagram
One of the three inputs in the gas distribution is connected to the analyzer via
valves (a "Double Block and Bleed" valve unit). A precisely defined quantity of the
gas to be analyzed is supplied to the separating columns by means of the injector.
This quantity is delivered through the separating columns with a carrier gas, which
represents a so-called mobile phase.
The separation of the gas mixture is based on the interaction between the station-
ary phase, the coating and/or filling of columns and the components of the gas that
flows past. With adsorption and a strong interaction of the individual components
with the stationary phase, the individual components are selectively delayed in
their passage in the stationary phase, moving at different speeds through the col-
umn. As a result, all of the components arrive at the end of the column at different
times.
Manual PGC 9300 EN07 June, 18th 2018