User guide

134 Advanced User Guide
6 Checking for Leaks
4
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)
5 Remove the old septum and replace it with a new one. See To
change the septum on the purged packed inlet.
6 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.
7 If unsure of the quality of the adapter ferrule, replace it. See
To change the glass insert on a PP inlet.
8 Configure, but do not install, a capillary column to put the
inlet in pressure control mode.
9 Set the inlet temperature to 100 °C.
10 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.
11 If pressure cannot be achieved, there is either a large leak or
the supply pressure is too low.
12 Set the Septum purge flow to 3.0 mL/min.
13 Cap the septum purge fitting with the ECD/TCD detector
plug.