118 EasyLine EL3000 Series Commissioning Instructions
Fidas24: Checking the seal integrity of the combustion gas feed
path in the gas analyzer
ATTENTION
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
(combustion 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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