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Installing 7890/7820/6890/6850 GC Columns
5975/5977 Series MSD Operating Manual
49
The GC/MSD Interface for a 7890B Series GC
The GC/MSD interface is a heated conduit into the MSD for the capillary column.
(See
.) It is bolted onto the right side of the analyzer chamber, with an
O-ring seal. It has a protective cover which should be left in place.
One end of the interface passes through the side of the GC and extends into the
oven. This end is threaded to allow connection of the column with a nut and
ferrule. The other end of the interface fits into the ion source. The end of the
capillary column extends slightly past the end of the column guide tube and into
the ionization chamber.
Figure 10.
GC/MSD interface for a 7890B GC with EI XTR, HES, and CI sources
Ionization
chamber
Analyzer
chamber
Heater/Sensor
assembly
MSD
GC oven
Heater sleeve
Insulation
Column
Column
guide tube
Optional entry for CI
reagent gas or JetClean
hydrogen system (not
supported in OpenLAB CDS
Tip seal
assembly
Ion source