User guide

Checking for Leaks 6
Advanced User Guide 139
6
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.
7 Wait 5 minutes for the pressure to equilibrate. If pressure
cannot be achieved, there is either a large leak or the supply
pressure is too low.
8 Set the Septum purge flow to 3.0 mL/min.
9 Cap the septum purge fitting with the ECD/TCD detector
plug.
10 From the keypad, press [Service Mode]. Select Diagnostics >
Front or Back Inlet > Pneumatics Control > Septum Purge control.
Back inlet purge
vent
Front inlet
purge vent
Back inlet split
vent
Front inlet split
vent
Front purge vent shown plugged