AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B 285
Fidas24: Checking the combustion gas feed path in the gas
analyzer for seal integrity
CAUTION
The seal integrity test described in this section requires special training
and under some circumstances involves working with the gas analyzer
open and powered up. Therefore, it must only be performed by qualified
and specially trained personnel.
If these conditions are not provided or the prescribed materials are not
available, a seal integrity test must be carried out by ABB Service.
Regular seal integrity check of the combustion gas path in the gas analyzer
The gas analyzer must be in operation (flame on).
1 Inspection of combustion gas feed path with positive pressure (com-
bustion gas inlet to combustion gas nozzle):
With a leak detector (measurement principle thermal conductivity) sniff
all the connection points.
2 Inspection of the combustion gas feed path with negative pressure (in
the detector, after the combustion gas nozzle):
Connect zero gas at the sample gas inlet.
Envelope all the connection points one after the other with a small gas
cloud containing hydrocarbons (e.g. with coolant or test gas containing
hydrocarbons or an acetone-soaked rag).
Observe the measured value display while doing so; if there is a positive
change in the measured value, the connection concerned is leaking.
If there is a leak, shut down the gas analyzer
If a leak has been established in the combustion gas feed path inside the gas
analyzer, the gas analyzer must be put out of operation; it may under no
circumstances be put into operation again. The cause of the leak must be
determined and remedied by ABB Service.
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