User guide

Checking for Leaks 6
Advanced User Guide 129
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.
10 Set the Total flow to 60 mL/min.
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.
12 If pressure cannot be achieved, there is either a large leak or
the supply pressure is too low.
13 Set the Septum purge flow to 3.0 mL/min.
14 Cap the septum purge fitting with the ECD/TCD detector
plug.