Tp 8: Baseline Cyclic Temperature Controller (Tcd); Tp 9: Baseline Cyclic Carrier Regulator; Tp 10: Baseline Cyclic Flow Controller - ABB PGC2000 Operation And Service Manual

1. Stop Analysis at the end of the analysis and make no sample injection until procedure is
completed.
2. Reduce isothermal and programmed temperature oven air temperatures by reducing oven air
pressures to zero psig.
3. Open Isothermal oven.
4. Inspect for disconnected or loose tubing connections or broken column in the column train from
the carrier regulator outlet to the column vent. Reconnect or tighten all tubing fittings. Check for
leaks and make necessary repairs. If corrections or repairs were made, proceed to step 8.
5. Loosen the fitting connecting the column to the LSV and verify carrier presence with a leak
indicator solution.
6. If carrier flow is not present or is insufficient, continue disconnecting fittings at each connection in
the column train working back toward the carrier supply one-at-a time, checking for the presence
of carrier. When full or nonrestricted carrier flow is detected, the trouble has been isolated
between the present and last connection checked. Make necessary repair(s). Reconnect or
tighten all fittings and check for leaks.
7. If carrier flow is present and not restricted, reconnect the fitting to the LSV. Beginning at the
column vent, work back toward the previously disconnected fitting, loosing each fitting in the
column train one-at-a-time, checking each loosened fitting for the presence of carrier. When full
or nonrestricted carrier flow is detected, the trouble has been isolated between the present and
last connection checked. Make necessary repairs. Reconnect or tighten all fittings and check for
leaks.
8. Check for correct carrier flow adjustment. Perform Test Procedure 2 (Carrier and Makeup Gas
Flow Adjustments), Test Procedure 5 (TC Detector Balance), and Test Procedure 44 (FPD
Gain Setting), as applicable.

TP 8: BASELINE CYCLIC TEMPERATURE CONTROLLER (TCD)

1. Refer to temperature control troubleshooting section and monitor temperature zones for stability
and control from the manual temperature control screen. Alarms relating to unstable temperature
may be present (Out of Control).
2. Check for sufficient oven air supply.
3. If temperatures are stable, temperature as a cause can be eliminated.

TP 9: BASELINE CYCLIC CARRIER REGULATOR

1. Observe the carrier and column pressure gauges in isothermal conditions. Often contaminated,
dirty or cyclic regulator performance can be observed as the carrier pressure oscillates between
two pressure gauge indications. The gauge pointer movement can be as little as ±0.25 psig or
as great as several pounds.
2. If the outlet pressure of the regulator is cyclic, replace regulator.
3. If performance is questionable, replace regulator.

TP 10: BASELINE CYCLIC FLOW CONTROLLER

1. If the cyclic baseline is not a function of the isothermal oven temperature or the carrier regulator,
and a flow controller is installed, the flow controller should be replaced.
2000-OSM, F1 7-5