Checking Analytical Flow Adjust - ABB PGC2000 Operation And Service Manual

Checking Analytical Flow Adjust

1. Set Valve One to OFF; Valve Two remains ON (see Figure 2-7).
CARRIER
IN
COLUMN
PRESSURE
ADJ
PI
AIR IN
ANALYTICAL
FLOW ADJ
Figure 2-7. MATCHING FLOW THROUGH ANALYTICAL FLOW ADJUST VALVE
2. To compensate for the pressure drop through Column 1, adjust the ANALYTICAL FLOW
ADJUST needle valve (accessed from the right side of the Oven Compartment) until the flow rate
at the cell vent of the detector cell is the same as the total column flow.
3. If the analyzer has several valves, first set the lowest-numbered valve ON and check the flow
rate. Then set the other valves on one at a time, checking the flow rate and adjusting the
corresponding restrictor (if necessary) after each valve is turned on.
2-12
AIR OUT
VALVE "OFF"
SAMPLE
VENT
6
1
7
2
SAMPLE
IN
3
8
9
4
10
5
BACKFLUSH
COLUMN 1
SAMPLE LOOP
AIR OUT
SELECTOR
FLOW ADJ
COLUMN
2
COLUMN
3
VENT
AIR IN
VALVE "ON"
6
1
2 7
3 8
4
9
10
5
DETECTOR
2000-OSM, F1
SELECTOR
VENT
CELL
VENT