ABB PGC2000 Operation And Service Manual page 254

11. Connect an ohmmeter between the two thermocouple leads. The ohmmeter reading should
indicate continuity. If it does not, the thermocouple is open. Replace the thermocouple (see "FID
REPAIR/Replacing the Thermocouple Assembly" in Section 8).
12. Connect the ohmmeter between one of the thermocouple leads and chassis ground. The
resistance should be high. If it is not high, the thermocouple may be shorted to chassis ground.
Replace the thermocouple (see "FID REPAIR/Replacing the Thermocouple Assembly" in Section
8).
13. Reconnect the thermocouple wires.
14. Apply power to the analyzer.
15. Connect a digital voltmeter betweenterminals7 and 8 of J49A.
16. Extinguish the FID flame. The "Flame Out" LED should illuminate. The DVM should indicate 2.5
mV or less.
17. Ignite flame and the LED should go out. The DVM should indicate 3.0 mV or greater.
18. If the electronics does not perform as described in steps 9 through 11, remove power and replace
the Detector Amplifier.
19. Close and tighten the right side door.
7-40 2000-OSM, F1