4.4.3 Manual Valve Control
NOTE: There are five solenoid valves on a single manifold and six solenoid valves
on a dual manifold system.
Five solenoid valves can be activated from the diagnostic screen. <click> the Flow
(Pressurization) (#1), the Dry Purge (#2), the Vent (#3), the Backflush (#4) and the
Bake (#6) valve(s) to energize or de-energize. If energized, the valve is outlined in red
and the gas flow will follow the appropriate pathway. A de-energized valve will not be
outlined in red and the gas will follow the appropriate pathway. <click> the valve again
to de-energize or energize. The valve(s) will stay in the selected position until manually
changed or a method or a new flow pathway is loaded. NOTE: When de-energized the
valves are normally closed, when energized they are open.
<click> the Flow (pressurization) valve icon and the pressurization valve screen will be
displayed as in shown in Figure 4d.
Figure 4d: Pressurization Valve manual setpoint screen.
Current Flow (ml/min) – Displays the current flow.
Setpoint (ml/min) – Enter the desired flow.
Flow to SP - <click> the Flow to SP button, this will activate the flow to the set point.
The flow will be maintained as selected until it is manually changed again or a method is
loaded.
Exit - <click> Exit to return to the Diagnostic screen.
4.4.4 Flow Pathway Drop Down Menu
Located at the upper right corner, the flow pathway drop down lists the flow pathway
diagrams for standby, purge, dry purge, desorb ready, desorb and bake, as shown in
Figure 4e. Select a pathway and <click>. The appropriate valve(s) will be energized
(outlined in red) and if required the 8 port valve will rotate to the correct position.
NOTE: If a run is in progress the solenoid valve(s) and the 8 port valve will not
change away from the current pathway.
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