2000 MS Hardware Maintenance
120
GC Maintenance
pressure-controlled injector, the column head pressure will remain constant even
if a leak is present.
Use the following procedure to change a septum on any Varian injector:
1. Cool the column oven and injector oven to 50 °C. This ensures safe handling
of injector parts and protects the column from elevated temperatures while it
is exposed to air.
2. Turn off the carrier gas supply to the injector.
3. Remove the injector nut by turning it counterclockwise.
4. Remove the old septum using tweezers or a septum pick (72-000084-00). It
is best not to handle any internal parts of the injector.
5. Install the new septum, again using tweezers to avoid contaminating the
injector.
6. Replace the injector nut and tighten it finger-tight until you feel resistance
from the septum, then tighten an extra 1/4 turn. Turn on the carrier gas
supply.
On occasion to save time you may want to change a septum while the injector is
hot. Use an injector wrench (03-908423-00) to remove and reinstall the injector
nut. In all instances the column oven should be cool before removing the injector
nut.
1079 Injector
The 1079 is a universal capillary injector that can be operated in several modes.
These modes include split, splitless, on-column and large volume injection.
Typically, to change from one mode of operation to another involves changing
the injector insert. The insert should also be cleaned or replaced on a routine
basis. This is especially important when dirty samples are being analyzed.
After prolonged use, the 1079 Universal Capillary Injector glass insert may need
to be removed either:
•
To clean the current glass insert for reinstallation in the 1079 Injector, or
•
To replace the current glass insert with a new insert.
