Tp 32: Peak Discrimination - ABB PGC2000 Operation And Service Manual

3. Extinguish flame by reducing burner air, fuel and carrier to zero by rotating regulator adjustment
counterclockwise until burner air fuel and carrier gauges indicate zero. When flame is out, the
"Flame Out" LED will illuminate.
4. Connect flow meter (e.g. bubble tower) to FID vent.
5. Increase carrier pressure to value indicated on the application data sheets provided with the
chromatograph. Both carrier pressure and carrier vent flow measurement at the FID vent should
be the same as indicated on data sheets. If values are the same, jet and flame arrester are not
plugged, Test Procedure 31 is complete. If values are low or nonexistent, the jet or flame arrester
may be plugged.
6. Reduce the temperature programmed (if applicable) and isothermal oven air pressures to zero
psig as indicated by their respective gauges.
7. Open the isothermal oven door.
8. If applicable, remove the temperature programmed temperature oven covers.
9. Disconnect the column fitting at the bottom of the FID. Connect the loose column end to a flow
meter.
10. Measure the carrier flow. If flow is restored to the expected measurement, the jet or breather is
plugged. Proceed to step 12. If flow is deficient, reconnect the column to the FID and perform
step 11.
11. Perform Test Procedure 1 (Carrier, Makeup and Utility Gas Supplies), Test Procedure 2
(Carrier and Makeup Gas Flow Adjustments), and Test Procedure 7 (Column Train Problems),
as applicable. If flow is restored, Test Procedure 31 is complete.
12. Remove the breather and replace with a female connector. Attach the flow meter to the open end
of connector. Measure the carrier flow. If flow is restored to normal, the flame arrester is plugged.
Replace the flame arrester.
13. Repeat steps 4 and 5 above. If flow remains restricted, the jet is plugged.
14. Inspect jet by removing FID cap (see "FID REPAIR" in Section 8). If jet plugging can not be
corrected by removing accumulated matter on jet tip, the FID must be replaced. The FID must be
returned to the factor for jet replacement. See "FID REPAIR" in Section 8 for instruction on
removing and reinstalling the FID.
15. Disconnect flow meter, reconnect and tighten all fittings, check for leaks, reattach programmed
temperature oven cover and close isothermal oven door using reverse procedure of steps 7 and
8.

TP 32: PEAK DISCRIMINATION

1. Request a calibration analysis.
2. Observe the peak areas and new response factors. If a greater percentage change has occurred
in the peak height, peak area, and response factors in the heavier components than in the lighter,
the presence of peak discrimination is apparent.
3. Perform Test Procedure 2 (Carrier and Makeup Gas Flow Adjustments).
4. Perform Test Procedure 7 (Column Train Problems).
2000-OSM, F1 7-25