Tp 42: Stream Switching - ABB PGC2000 Operation And Service Manual

20. Check vortex cooler efficiency as follows. Access the Manual Temperature Control Mode by
performing steps 1 to 3, 8 and 9 of Test Procedure 30 (Checking Temperature Table Values).
Change zone 2 set point to 0 deg and rate to 0.1.
21. Monitor the actual zone 2 temperature until temperature measurement is stable.
Discharge air from the vortex cooler is extremely hot and can cause severe burns.
22. Protecting your hands with insulated gloves, adjust the vortex cooler at the discharge end for
maximum cooling (minimum temperature) as indicated on actual zone temperature.
23. Enter set point at initial temperature.
24. Close and secure all doors and all covers.
25. Allow temperature to equilibrate.

TP 42: STREAM SWITCHING

It is the customer's responsibility to ensure that the area is safe and and hazard-
free, and will remain so the entire time the analyzer is open. This responsibility
includes ensuring adequate ventilation in analyzer shelter and obtaining proper
work permits, etc.
See "AIR PURGING" in Section 4 for the override function. Do not perform
override until you have read Section 4 completely and you understand and can
perform the procedure requirements.
1. Check valve assignment in method tables.
2. Verify stream is active. Make necessary changes.
3. If electric solenoid valve stream switching is used, proceed to step 6.
4. If air operated valves are used for stream switching, verify actuation air is being applied to the
stream select valve actuator. Gently loosen the two fittings at the actuator. Apply "Leak Tech",
"Snoop" or other similar liquid leak detector to the back of the fittings.
5. Request an analysis for the steam in question. At stream step, the stream will begin to purge as
indicated on the background screen. Actuation air will be applied to the respective actuator,
producing bubbles at the loose fitting. When the next different stream is selected, bubbles should
cease at the present actuation line. If the actuation is double acting, air will be present at the
other actuation line and bubbles will be produced by the leak detector. All streams can be tested
in this manner. Reconnect or tighten each fitting that was loosened.
6. If no air is present, check to ensure air is being applied to solenoid valve by loosening the
solenoid valve air supply inlet connection. Loosen the inlet air fitting and test for the presence of
air with a leak detection solution.
7. If air is applied to the solenoid valve, test to ensure that the solenoid actuation voltage is being
applied.
8. Turn off purge air to analyzer and override X purge.
7-36
WARNING
CAUTION
2000-OSM, F1