M
AINTENANCE
1079 Injector
CP-3800 GC Getting Started Manual
53
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 (P/N 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 (P/N 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.
