User guide

Checking for Leaks 6
Advanced User Guide 135
14
From the keypad, press [Service Mode]. Select Diagnostics >
Front or Back Inlet > Pneumatics Control > Septum Purge control.
15 Scroll to the Constant duty cycle and enter 50. Wait 10 seconds.
16 Press [Front or Back Inlet]. Scroll to Pressure and press Off/No.
17 Quickly turn off the carrier gas supply at its source.
18 Monitor the pressure for 10 minutes. Use the timer by
pressing [Time] and [Enter].
A pressure drop of less than 0.7 psig (0.07 psi/min or less;
4.8 kPa or 0.48 kPa/min) is acceptable.
If the pressure drops much faster than the acceptable rate,
see “To Correct Leaks in the Packed Column Inlet”. Retest.
Back inlet purge
vent
Front inlet
purge vent
Back inlet split
vent
Front inlet split
vent
Front purge vent shown plugged