Inficon HAPSITE Smart, Operating Manual

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HAPSITE Smart Operating Manual
Figure 11-15 Accessing the Inlet States
The following choices are available in the Inlet States column:
Loopfill . . . . . . . . . . . . . . . . . . . . . . . This sets the GC valves so that the sample
pump pulls the sample either through the
sample loop. The recommendation is the
Loopfill duration be at least 60 seconds to
allow for clearing the sample line of the
previous sample as well as good mixing with
the Internal Standard (if used).
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.
Backflush . . . . . . . . . . . . . . . . . . . . This Inlet State sets the valves on the GC so
that carrier gas is directed to the input of the
analytical column and into the output of the
precolumn. The Backflush state provides the
ability to customize the GC method so
volatile compounds that pass quickly through
the precolumn 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 precolumn quickly to clear the GC for
the next analysis, while the 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.