INFICON HAPSITE ER Chemical Identification System - Manual (Page 358)

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HAPSITE ER Operating Manual
The following choices are available in the Inlet States column:
Loopfill . . . . . . . . . . . . . . . . . . . . . . This Inlet State controls the sample pump
pulling the sample through the Sample Loop.
It is recommended that the Loopfill duration
be at least 60 seconds. This allows for
clearing the sample line of the previous
sample. It also allows for the sample to mix
well 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 the Carrier
Gas will push sample out of the Sample Loop
and onto the column. The Foreflush time
should be set so that all of the volatile
compounds of interest will pass through the
column and onto the analytical column prior
to Backflush.
Backflush . . . . . . . . . . . . . . . . . . . . This sets the GC valves so that the Carrier
Gas is directed to the input of the analytical
column. The Backflush state provides the
ability to customize the GC method so
volatile compounds that pass quickly through
the column and onto the analytical column,
during the Foreflush state, can be separated
from less volatile compounds. The less
volatile compounds are pushed back out of
the column, while the more volatile
compounds of interest are separated on the
analytical column for MS analysis.
ISTune . . . . . . . . . . . . . . . . . . . . . . . This state sets the GC valves so the Internal
Standard Gas is directed to the Mass
Spectrometer for MS tuning.
Survey . . . . . . . . . . . . . . . . . . . . . . . This Inlet State sets the GC valves and turns
on the sampling pump so that the sample will
by-pass the GC and be directed to the inlet of
the MS for real time analysis.
NOTE: Survey is the Inlet State used (by
default) in the Survey and Method
that are direct sample, single
compound Methods. This cannot be
changed.