AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B 337
Flame does not ignite
Air in the combustion gas line
When connecting or replacing the combustion gas bottle make sure that no
air penetrates into the combustion gas supply line. Air which has penetrated
the gas supply line results in the flame in the analyzer going out.
The analyzer module automatically tries to reignite the flame up to 10 times
in a period of approx. 10 minutes with increased combustion gas pressure
each time. If this is unsuccessful, the analyzer module switches to operating
status "Wait for restart". In this case ignition of the flame must be restarted:
Menu
→ Maintenance/Test → Analyzer spec. adjustm. →
Standby/Restart FID
Remark: The operating status "Wait for restart" means: Heater on, Combus-
tion gas valve closed, Instrument air valve open, Housing purge on.
Combustion air pressure too high
Reduce combustion air pressure (note details in Analyzer Data Sheet).
Fidas24 in fail-safe status
If a serious fault has occurred in the analyzer module, the analyzer module is
put in fail safe status; in the menu Standby/Restart FID the indication
Fail safe appears for the parameter Status.
Fail-safe status: heater off, combustion gas valve closed, instrument air
valve closed, housing purging on, zero gas valve open.
The cause of the failure must be determined from the status messages (see
page 322).
A cold restart in the menu is not possible; after fault correction the gas ana-
lyzer must be cold restarted by switching off and on again.
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