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GC Maintenance
WARNING:
FIRE HAZARD
Use proper eye and skin protection. Methanol and acetone are toxic and
flammable chemicals. Exercise appropriate precautions when these chemicals
are used.
4. Remove the injector nut, septum, and septum support, with ferrule and insert
attached.
5. Moisten a cotton swab and a stick with methanol and gently swab center of
the injector body.
6. Moisten a cotton swab on a stick with iso-octane and gently swab the center
of the injector body.
7. Examine the end of the fused silica column to ensure that it has not been
damaged. Slide the end of the fused silica column into the opening of the
injector.
8. Gently twist the column nut in the opposite direction used to tighten the nut.
Place the column nut on the end of the injector and tighten the nut. This
procedure minimizes twisting the column.
9. Use
the
5/16
″
open-end wrench and tighten with 1/6-turn to secure the
column in place.
10. Replace the septum support, insert, ferrule, septum, and injector nut.
11. To check whether the injector is leak-tight, connect a flow meter to the split
vent. Set the Relay to the split mode. If the flow meter indicates a flow less
than previously measured, the injector has a leak.
12. Turn the column oven back on by pressing the “TURN OVEN ON” softkey in
the column oven section of the method.
How to Remove the Capillary Column from the System
To remove the capillary from the system, proceed as follows:
1. Turn off the GC column oven and heater. Shutdown and vent the mass
spectrometer.
2. Open the inside of the GC oven. Make sure that about 30 cm (12 in.) of the
mass-spectrometer end of the capillary column is hanging freely, so that you
can move the mass spectrometer away from the GC without breaking the
column.
3. Keep an eye on the capillary column in the GC oven as you gently slide the
mass spectrometer away from the GC.
•
As you slide the mass spectrometer away, take care not to allow the
column to bind or kink. When you have fully withdrawn the mass
spectrometer from the GC, the distance separating them should be
≥
23
cm (9 in.). The transfer line should be fully removed from the GC oven.
