Low Carrier Pressure Hardware Alarm; Low Sample Flow Hardware Alarm; Loss Of Purge Air - ABB PGC2000 Operation And Service Manual

Low Carrier Pressure Hardware Alarm

Symptom: Low carrier gas alarm. If carrier is in short supply and not corrected, carrier flow rates will
reduce as the gas is depleted. Analyzer data will become erroneous as carrier pressure drops below
the analyzer requirement.
Causes: The following can be causes for low carrier pressure alarm.
1. Low carrier gas supply. Perform Test Procedure 1 (Carrier, Makeup, and Utility Gas Supplies).
2. Defective or incorrectly adjusted carrier pressure switch. Perform Test Procedure 39 (Low
Carrier Pressure).
3. Inlet filter or restrictor for hydrogen is plugged.

Low Sample Flow Hardware Alarm

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.
Ensure adequate ventilation in analyzer shelter.
See "AIR PURGING" in Section 4 for the override function. Do not perform
override until you read Section 4 completely and you understand and can perform
the procedure requirements.
Symptom: Rotometer and pressure gauge indications are below normal. Bubbles may be seen in
analyzer effluent rotometer. Individual components, RVP and V/L calculation values are not
repeating.
Causes: The following can be causes for low sample flow alarm.
1. The sample booster pump is not operating or has failed. Check pump inlet and discharge
pressure and power.
2. Defective or incorrectly adjusted sample flow switch. Perform Test Procedure 40 (Low Sample
Flow Hardware Alarm).
3. Sample flow alarm checked during sample shutoff portion of analysis.

Loss of Purge Air

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.
2000-OSM, F1
CAUTION
CAUTION
6-25