Checking for Leaks 7
Agilent 7890 Series Troubleshooting 165
To Correct Leaks in the PTV Inlet
If the inlet fails a pressure decay test, check the following:
• Check the caps/plugs used in the test—make sure each is
correctly installed and tight.
• If you performed the leak test after performing maintenance,
check for proper installation of the part(s) handled during
the maintenance.
• If using a septum head, check the tightness of the septum
nut. See To change the septum on the PTV inlet.
• If using a septum head, check the septum. Replace if old or
damaged.
• Check that the septumless- or septum- head assembly is
installed tightly.
• Replace the liner and Graphpak 3D ferrule. See To change
the liner on the PTV inlet.
• Check the Graphpak adapter seal against the inlet body.
Replace the silver seal and reinstall the adapter if needed.
See To replace the inlet adapter for the PTV inlet.
• If using the septumless head, check for leaks around the
guide cap. Replace the PTFE ferrule in the guide cap. See To
replace the PTFE ferrule on a PTV inlet.
• Check for leaks at the split vent trap. Tighten as necessary.
Replace the split vent trap filter and O-rings. See To replace
the filter in the PTV inlet split vent line.
• Make sure the inlet temperature remained constant during
the test.
If these items not resolve the problem, contact Agilent for
service.
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