40 Agilent 7697A Troubleshooting
4 Leaks
To Run the Restriction and Pressure Decay Test
The built- in restriction and pressure decay test sequentially
checks for restrictions and leaks in the sampling system. The
test checks for:
• Restrictions in the sample probe
• Restrictions in the vent line
• Leaks around the sample probe
• Leaks around the sample loop
• Leaks in valves and in the six port valve
The test consists of several parts. If one part fails, the test
reports the failure and stops before attempting any
subsequent parts. Correct the problem, then re- run the test.
Continue correcting problems and retesting until the test
completes successfully.
Before running the built- in restriction and pressure decay
test, check the GC for leaks. See “Leak Check General
Procedure” and the GC user documentation.
1 Gather the following:
• Leak test kit (G4556- 67010). Includes: six port valve
cap (G6600- 80039), no hole ferrule (5181- 7458), blue
leak test vial (G4556- 20600), 1/8- inch Nylon Swagelok
plug (0100- 2414)
• GC liner, O- ring, and septum as needed
• 3/16- inch wrench
• 7/16- inch wrench
• 1/4- inch wrench
• 5/16- inch wrench
2 If unsure of the quality of the GC inlet septum, liner, and
liner O- ring, change them now. Refer to the GC user
documentation for details.
3 Set the active method vial size to 20 mL. Press [Vial],
scroll to Vial size, press [Mode/Type] to select the vial size
from a list, then press [Enter].
4 Install a new septum into the blue leak test vial.
5 Place the blue leak test vial into priority position 1 (111
vial model) or into tray position 1 (12 vial model).
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