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GC/MSD interface
The GC/MSD interface is a heated conduit into the MSD for the capillary
column. It is bolted onto the right side of the vacuum manifold, with an
O-ring seal. A channel machined into the flange for the seal provides thermal
isolation between the heated interface and the O-ring and manifold. The GC/
MSD interface is covered by a protective cover which should be left in place.
One end of the GC/MSD interface passes through the side of the gas
chromatograph and extends into the GC oven. This end is threaded
(thread size is 10
ferrule. The other end of the GC/MSD interface fits into the ion source. The
last two millimeters of the capillary column extend past the end of the guide
tube and into the ionization chamber.
The GC/MSD interface is heated by an electric cartridge heater. The heater
is powered and controlled by Thermal Aux #2 heated zone of the HP 6890
Series GC. The GC/MSD interface temperature can be set from the MSD
ChemStation or from the keypad of the gas chromatograph. A sensor (ther-
mocouple) in the GC/MSD interface monitors the temperature.
The GC/MSD interface should be operated in the 250° to 350°C range.
Subject to that restriction, the GC/MSD interface temperature should be
slightly higher than the maximum GC oven temperature, but
than the maximum column temperature.
To install a capillary column using the installation tool, 28
See Also
To install a capillary column without the installation tool,26
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