Checking Selector Flow Adjust; Checking Selector Vent - ABB PGC2000 Operation And Service Manual

Checking Selector Flow Adjust

1. See Figure 2-9. Set Valve One to ON and Valve Two to OFF.
CARRIER
IN
COLUMN
PRESSURE
ADJ
PI
AIR OUT
ANALYTICAL
FLOW ADJ
Figure 2-9. MATCHING FLOW THROUGH SELECTOR FLOW ADJUST VALVE
2. To compensate for the pressure drop through Columns 1 and 2, adjust the SELECTOR FLOW
ADJUST needle valve until the flow rate at the cell vent is the same as the total column flow.

Checking Selector Vent

1. See Figure 2-9. Connect the flow-measuring device to the Selector Vent and verify that Valve
One is ON and Valve Two is OFF.
2. To compensate for the pressure drop through Column 3, adjust the Selector Vent restrictor until
the flow rate at the Selector Vent is the same as the total column flow.
2-14
AIR IN
VALVE "ON"
SAMPLE
VENT
6
1
2
7
SAMPLE
IN
3
8
4 9
10
5
COLUMN 1
BACKFLUSH
SAMPLE LOOP
VENT
AIR IN
SELECTOR
FLOW ADJ
COLUMN
2
COLUMN
3
AIR OUT
VALVE "OFF"
1 6
2
7
3 8
4
9
10
5
DETECTOR
2000-OSM, F1
SELECTOR
VENT
CELL
VENT