Thermo Scientific FOCUS GC, Instruction Manual, Page: 147 / 356

Chapter 7
Keeping Leaks Under Control Column
Instruction Manual 147
OPERATING SEQUENCE
Manual Checking for Leaks
Before you begin this sequence, you must install the column into the injector, but
not into the detector base body.
Materials needed:
• silicon rubber septum of any dimension
1. Carefully push the detector end of the capillary column into the rubber septum
to seal it.
2. Set split and purge valves Off. See Controlling Valves .
3. Increase the carrier gas pressure to 150–200 kPa and allow the column and
injector pressure to stabilize. This can take up to 30 seconds.
4. Reduce the pressure to 50 kPa.
5. Observe the actual pressure. In a leak-tight system, the pressure should not
drop more than 1 kPa/minute.
6. If your installed column is leak tight, remove the septum and prepare the end
of the column for installation into the detector.
7. If it is not leak tight, check the tightness of the column ferrule and repeat the
leak check sequence.