EL3000
CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
175
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 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 switches to operating condition "Wait for restart".
In this case, ignition of the flame must be restarted:
‘
Operation /
Pump / Standby /
Fidas Standby /
Fidas Restart’
Note
The “Wait for Restart” operating condition means: heating on,
combustion gas valve closed, instrument air valve open, housing
purging on.
Combustion air pressure too
high
• Reducing the combustion air inlet pressure
(Note the information given in the analyzer data sheet).
Fidas24 in fail-safe status
If a serious error occurs in the analyzer, the device is
automatically set to the fail-safe state.
Note
The Fail-safe status means:
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 (refer to
It is not possible to restart the analyzer in the “Fidas Restart”
menu; after the error has been eliminated, the gas analyzer must
be restarted by switching it off and on again.
In case of instrument air supply failure
It must be ensured that the gas supply to the analyzer module is
shut off if the instrument air supply fails.
This is generally ensured by the installation of a pneumatic shut-
off valve in the combustion gas supply line (refer to
valve in the combustion gas supply line
must be controlled by the instrument air supply in such a way
that, should it fail (and therefore, also in the event of failure of
the continuous purging of the housing) the combustion gas
supply is automatically shut off (refer to
If such a pneumatic shut-off valve is not installed, the following
precautions and measures must be taken:
• The Overall Status or the "Failure" status of the gas
analyzer must be monitored.
• If the status appears, the cause must be verified in the
gas analyzer on site:
– if the gas analyzer is not in operation (for example as
a result of a voltage failure), the operating gases must
be shut off (see
Fidas24 – Shutting down the gas
– If the gas analyzer is in operation, an adequate
instrument air supply must be verified. If this is the
case, the status messages must be verified. If this is
not the case, proceed as follows:
1. Shut off the combustion gas supply.
2. Reestablish instrument air supply.
3. Purge gas analyzer for 20 minutes.
4. Turn on combustion gas supply.
5. Gas analyzer starts automatically.
Note for measuring combustion gases
When measuring combustion gases, it must be made sure that in
case of a failure of the instrument air supply or of the analyzer
module itself the sample gas supply to the analyzer module is
shut off and the sample gas path is purged with nitrogen.
