Checking for Leaks 7
Agilent 7890 Series Troubleshooting 167
1
Gather the following (see Consumables and parts for the VI):
• No-hole ferrule
• 1/4-inch wrench
• Heat-resistant gloves (if the inlet is hot)
• Long column nut
• 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 Set the inlet to Split Mode.
6 Configure the column as 0 length.
7 Set the inlet temperature to 100 °C.
8 Set the Total flow to 60 mL/min.
9 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.
10 If pressure cannot be achieved, there is either a large leak or
the supply pressure is too low.
11 Set the Septum purge flow to 3.0 mL/min.
12 Allow the inlet temperature to stabilize. Temperature
changes can invalidate the test.
The test can find leaks at the: The test cannot find leaks at the:
sampler connection column fitting
pressure sensing line connection to
the interface
gas supply bulkhead fittings to the
flow module
split vent line connection to the
interface
tubing and connections in a transfer
line connected to the inlet
the connected sampler’s entire
sample flow path
flow manifold split vent valve
flow manifold septum purge valve
split vent tubing and trap
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