The Ei Gc/Msd Interface - Agilent Technologies G7035A Operation Manual

The EI GC/MSD Interface

The GC/MSD interface
for the capillary column. 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 GC/MSD interface passes through the side of the gas
chromatograph and extends into the GC 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 last 1 to 2 mm 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. Normally, the
heater is powered and controlled by Thermal Aux #2 heated zone of the GC.
The interface temperature can be set from MassHunter Data Acquisition or
from the gas chromatograph. A sensor (thermocouple) in the interface
monitors the temperature.
The GC/MSD interface should be operated in the 250  to 350 C range. Subject
to that restriction, the interface temperature should be slightly higher than the
maximum GC oven temperature, but never higher than the maximum column
temperature.
The EI GC/MSD interface can only be used with an EI ion source. There are
two types of tip seals that may be used with EI ion sources. The standard/inert
EI ion sources do not need a tip seal. The extractor ion source on an EI only
system uses a tip seal (G3870-20542). The extractor ion source and the CI ion
source on an EI/CI system uses the CI tip seal (G1999-60412).
See also
"To Install a Capillary Column in the GC/MS Interface"
The GC/MSD interface operates at high temperatures. If you touch it when it is hot,
WARNING
it will burn you.
5977 Series MSD Operation Manual
Operating in Electron Ionization (EI) Mode
(Figure 11 on page 54) is a heated conduit into the MSD
on page 38.
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