Checking for Leaks 7
Agilent 7890 Series Troubleshooting 151
To Perform a PP Pressure Decay Leak Test
Use the Agilent Instrument Utilities Purged/Packed Inlet
Pressure Decay Test to determine if the inlet is leaking. Open
the software, select the GC, and run the test for the inlet.
If the Instrument Utilities software is not available, see the
procedure below.
If the test fails:
• Tighten the septum nut/Merlin cap.
• Replace the septum or Merlin Microseal.
• Tighten the top insert weldment. Replace the liner.
• Replace the O-ring and tighten the column adapter
connection. Re-install if needed.
• Check the plugged column fitting and the septum purge cap.
To Per fo rm a PP In le t Pressure Decay Test
The pressure decay test checks for leaks from the inlet flow
module up to the column fitting.
After performing maintenance, first check for leaks in
externally accessible areas. See “To Check for External Leaks”.
If a leak is known to exist, check the externally accessible inlet
fittings first, especially any connection that has seen recent
maintenance, such as the septum nut, column adapter, column
connection, and so forth.
The pressure decay leak test described below requires removing
the column and capping the inlet column fitting. This test
can/cannot find the following types of leaks:
The test can find leaks at the: The test cannot find leaks at the:
septum column fitting
septum nut gas supply bulkhead fittings to the
flow module
glass insert O-ring seal
adapter and ferrule
inlet body
top insert weldment
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