174
EL3000
CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
… 12 Diagnosis / Troubleshooting
Fidas24 – Troubleshooting
Flow error
Sample gas inlet nozzle or sample gas filter clogged
• Checking the sample gas connection for blockages of the
sample gas inlet nozzle and the sample gas filter.
• Replace sample gas filter (refer to
sample gas filter in the heated sample gas connection
on page 190).
Temperature Problem
Connection le
ads of the temperature sensor or the heater
disconnected
• Check the connection leads and connectors.
• Check the fit of the leads in the wire end ferrules.
• Checking the power supply to the heating system.
Unstable display of measured value
Vibrations
• Reduce vibration at the installation site.
Sample gas path leaking
• Checking for leaks in the sample gas path in the analyzer
module and the sample extraction system.
Loss of sensitivity
• Having the service team replace the sample gas nozzle.
Sample gas outlet pressure too high
• Check the air jet injector for blocks, and clean it where
applicable (refer to
Cleaning the Fidas24 air jet injector
on page 191). Increase instrument air pressure. Check air
discharge line; it must have a large inside diameter.
Combustion air contaminated
• Check combustion gas supply
Fluctuating process gas pressures
• Check the supply of instrument air, combustion air and
combustion gas
Pressure regulator fault
Unstable pressure values
• Set the external pressure of the process gases such that
the manipulated variable are as follows:
Instrument air ‘
Output’
approx. 60 %,
for combustion air ‘
Air
’ approx. 55 %,
for combustion gas ‘
H
2
’ approx. 42 % ,
see
Adjust output variables of the internal pressure
on page 105.
• Have the pressure regulator modules checked.
Pressure regulator output variables not equal to set points
Manipulated variable
Measures
Air
Manipulated variable
≤
50%
Reduce combustion air primary pressure.
Manipulated variable
≤
90 %
Increase combustion air primary
pressure.
H
2
Manipulated variable
≤
40 %
Reduce combustion gas primary
pressure.
Manipulated variable
≤
90 %
Increase combustion gas primary
pressure.
Input
Manipulated variable
≤
50%
Reduce sample gas inlet pressure.
Output
Manipulated variable
≤
50%
Increase the instrument air pressure.
Cleaning the air jet injector (refer to
Cleaning the Fidas24 air jet injector
on
page 191).
Reduce length of the gas discharge line or
increase cross-section.
Manipulated variable
≤
90 %
Reduce instrument air pressure.
Zero point drift
Sample gas line contaminated
• Cleaning the sample gas line.
Combustion air catalyst is not operating adequately
• Reduce hydrocarbon content.
• Exchange catalyst.
Combustion gas line
contaminated
• Clean combustion gas line.
