152 Agilent 7890 Series Troubleshooting
7 Checking for Leaks
1
Gather the following (see Consumables and parts for the
purged packed inlet):
• No-hole ferrule
• 1/4-inch wrench
• 7/16-inch wrench
• Heat-resistant gloves (if the inlet is hot)
• 9/16-inch wrench
• 1/8- and 1/4-inch Swagelok caps
• ECD/TCD Detector plug (part no. 5060-9055)
2 Load the inlet maintenance method and wait for the GC to
become ready.
3 Set the total flow to 40 mL/min and purge the inlet for about
1 minute.
4 Remove the column, if installed.
5 Plug the column fitting.
• If the capillary column adapter is installed, use a column
nut and a no-hole ferrule
• If a 1/8-inch packed column adapter is installed, use a
1/8-inch Swagelok cap (5180-4121).
• If a 1/4-inch packed column adapter is installed, use a
1/4-inch Swagelok cap (5180-4120)
6 Remove the old septum and replace it with a new one. See To
change the septum on the purged packed inlet.
7 Inspect the O-ring and replace it if it is hard and brittle or
cracked. See To change the O-ring on the purged packed inlet.
8 If unsure of the quality of the adapter ferrule, replace it. See
To change the glass insert on a PP inlet.
9 Configure, but do not install, a capillary column to put the
inlet in pressure control mode.
10 Set the inlet temperature to 100 °C.
11 Enter a pressure setpoint of 25 psi (172 kPa). Make sure that
the pressure supplied to the GC is at least 10 psi (70 kPa)
higher than the inlet pressure.
seals within the tubing between the
inlet flow module and the inlet body
The test can find leaks at the: The test cannot find leaks at the:
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