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The other housing, further referred as “Slave unit” contains the third and optionally
fourth channel (depending in the application). It has no CPU board inside. It is labelled
as “QS” on the Safety approval label.
Both housings have a separate power supply board (interconnection board). The slave
unit shares the output of the stream selection in the master unit and therefore no
additional stream selection is needed.
The required gas connections between the two housings are preinstalled.
11.4 Option H2: Hydrogen carrier gas
This analyser is configured to work with Hydrogen as carrier gas. Normally the carrier gas
is a non-explosive one (Helium / nitrogen / Argon) and it is purged inside the housing to
keep the atmosphere in the housing clean. However with hydrogen we cannot do that
since it might cause an explosive atmosphere. As such it needs venting of the carrier to
safe area.
There is a vent connection marked “column vent” that should be connected to a vent
going to safe area without restriction or back pressure.
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