Agilent Technologies 7890A Troubleshooting

Checking for Leaks 7
Agilent 7890 Series Troubleshooting 161
To Perform a PTV Pressure Decay Test
See the procedure below.
If the test fails:
• Check the plugged column fitting and septum purge cap.
• Check the septum head. Tighten if needed.
• Replace the septum if necessary.
• If using a septumless head, tighten. Rebuild as needed.
• Inspect and re-install the liner if it is leaking.
• Replace the inlet adapter if it is leaking.
• Tighten the split vent trap if needed, or install a new
cartridge and O-rings.
• Tighten the split vent line connection to the inlet.
To Perform a PTV 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:

Agilent Technologies 7890A Specifications

General

Brand	Agilent Technologies
Model	7890A
Category	Laboratory Equipment
Language	English