Elster GmbH
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EnCal 3000 Quad– Hardware Manual
22/06/2017
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2.9
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)
fig. 2-13 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.
Stream purge
Pressure regulators
Stream selection block
Helium purge valve
(optional)
