Inlets and valves
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 76
8. Connect the column to the ZDV union using
the appropriately-sized liner and the counter-
bored nut provided (capillary columns) or
1/8-inch nut (packed columns).
9. Clean up any pieces of insulation in the oven.
10. Plug in the GC power cord.
Leak test
Leak test the system using an electronic leak
detector (if available and if helium is used as the
carrier gas) or as described below.
1. If using hydrogen as a detector gas, turn it
off.
2. Make sure the pressure at the carrier gas
supply is at least 35 psi.
3. Disconnect the column at the detector fitting
and plug the end:
• Packed column: cap the end with a clean
Swagelok cap.
• Capillary column: insert the end of the
column into the side of a clean septum.
4. Close the oven and turn on the GC.
5. Use the Control Module or data system to
define a capillary column with length 0 m
and any diameter. This puts the inlet into
pressure control mode.
6. Set the inlet and oven to normal operating
temperatures.
7. Set the inlet pressure to 25 psi.
If pressure cannot be reached, there is a
gross leak. Check the column cap.
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