INFICON HAPSITE Smart Plus Chemical Identification System - Manual (Page 379)

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HAPSITE Smart Plus Operating Manual
Figure 11-17 Accessing the Inlet States
The following choices are available in the Inlet States column:
Loopfill. . . . . . . . . . . . . . . . . . . . . . . This sets the GC valves when a Loop is being
used so that the sample pump pulls the
sample through the Sample Loop. The
recommendation is the Loopfill duration be at
least 60 seconds. This allows for clearing the
sample line of the previous sample as well as
good mixing with the Internal Standard (if
used).
Line Purge. . . . . . . . . . . . . . . . . . . . This Inlet State pulls the sample through the
probe and out through the exhaust vent. The
sample does not go through the
Concentrator.
Foreflush . . . . . . . . . . . . . . . . . . . . . This sets the GC valves so that Carrier Gas
will push sample out of the Sample Loop and
onto the precolumn. The Foreflush time
should be set so that all of the volatile
compounds of interest will pass through the
precolumn and onto the analytical column
prior to Backflush.