Checking for Leaks 7
Agilent 7890 Series Troubleshooting 147
1
Gather the following (see Consumables and parts for the
Multimode inlet):
• No-hole ferrule
• 1/4-inch wrench
• Heat-resistant gloves (if the inlet is hot)
• Column nut
• New septum
• O-ring
• ECD/TCD Detector plug (part no. 5060-9055)
2 Load the inlet maintenance method and wait for the GC to
become ready.
3 Remove the column, if installed.
4 Plug the column fitting with a column nut and a no-hole
ferrule.
5 Remove the old septum and replace it with a new one. See To
change the septum on the multimode inlet.
6 Inspect the O-ring and replace it if it is hard and brittle or
cracked. See To change the liner and O-ring on the
Multimode inlet.
7 Set the inlet to Split Mode.
8 Configure the column as Inlet: Unspecified.
9 Set the inlet temperature to 70 °C.
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
liner O-ring seal tubing and connections in a transfer
line connected to the inlet
inlet body
flow manifold split vent valve
flow manifold septum purge valve
split vent tubing and trap
septum purge tubing
seals within the tubing between the
inlet flow module and the inlet body
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