Checking for Leaks 7
Agilent 7890 Series Troubleshooting 133
To Perform an Inlet Leak Check
The GC provides a real-time, built-in leak check for all inlets.
This check is most useful for finding inlet leaks during and after
inlet maintenance. While not as thorough or sensitive as a
complete inlet pressure test, it is normally performed with the
column installed and configured, and provides a quick
assurance that the inlet is reasonably leak-free. Agilent
recommends running the check before and during inlet
maintenance, so that as you tighten any fittings you can watch
the inlet stop leaking. The test is appropriate for all
applications, although some may require more robust leak
testing.
The inlet leak check finds leaks at the:
• Inlet column fitting
• Gold seal (as applicable)
• Split vent trap housing (as applicable)
• Septum nut and septum (as applicable)
• Insert weldment nut/septum head assembly (as applicable)
To run the test:
1 At the GC keypad, press [Service Mode], scroll to Front inlet
leak check or Back inlet leak check, then press [Enter].
2 The display will be similar to Figure 4:
Figure 4 Example front inlet leak check display. Example assumes a
test has been previously run. (Scroll the display to see all
lines.)
FRONT INLET LEAK CHECK
TotalFlow 1.74 Col 1.34<
Test Inlet (ON to Start)
Test pressure 10.0 psi
Warning if check flow OFF
Fault if check flow OFF
Last test results
Tue Oct 20 16:07 2009
Test flow OK: 4.8
Reset the test results? (yes)
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