Reference
Page 68
User Manual Micro-GC
Varian, Inc.
Backflush option
Backflush to vent is an advanced technique, which is used to prevent later
eluting compounds to reach the analytical column and detector. The main
reason for applying this technique is to keep the analytical column clean and
reduce analysis time.
The Varian Micro-GC is optionally available with GC modules that incorporate
backflush capabilities.
A backflush system always consists of a pre-column and an analytical column.
The two columns are coupled with a so-called pressure point, which makes it
possible to invert the carrier gas flow direction through the pre-column at a
preset time, the "backflush time".
Pre-column
Analytical
column
Detector
Injector
Backflush
vent
Pressure point
Restriction
Pressure
regulator
System
pressure
Summary of Contents for Micro-GC 490-GC
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