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5.4 Internal sample system
The internal sample system has the following functions:
• Double block and bleed stream selection (up to 5 streams / 1 cal)
• Pressure regulator. Advised input pressure is 2 barg. Input pressure range is 1
to 5 barg
• Split of the helium and sample gas to the 2 analytical columns
• Combination of the vent lines of the 2 modules
• Purge of the cabinet with Helium (optional)
• Integrated fast loop function (stream purge)
Figure 5.10: Front view of the internal sampling/stream selection system
Helium Purging (optional)
Helium enters the manifold and is split to both analytical modules. Through a purge
valve the helium can be vented into the housing, to expel the air in the housing (activated
by time relay 3). Additionally to this the column vent is released into the housing which
is nearly pure helium. If there is a leak in the housing no combustible mixture can be
formed because of the absence of air. The housing withstands the pressure of an
explosion but by purging the housing with Helium the chance of internal damage is also
reduced significantly. The purge and the small amount of helium that is vented into the
housing also protects the internal components against moisture or other aggressive
components entering the housing through the breather.
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