ABB AO2000 Series Operating Instructions Manual page 336

336
Pressure regulator fault
Zero drift
AO2000 CONTINUOUS GAS ANALYZERS
Unstable pressure values
Adjust external pressure of the supply gases such that the output varia-
•
ble
for instrument air (output) is approx. 60 %,
for combustion air (Air) is approx. 55 %,
for combustion gas (H2) is approx. 42 %.
Have the pressure regulator modules checked.
•
Pressure regulator output variables not equal to set points
Air Output variable ≤ 50 % •
Output variable ≥ 90 % •
Output variable ≤ 40 % •
H2
Output variable ≥ 90 % •
Output variable ≤ 50 % •
Input
Output variable ≤ 50 % •
Output
Output variable ≥ 90 % •
Sample gas line contaminated
Clean sample gas line.
•
Combustion air catalyst is not operating adequately
Reduce hydrocarbon content.
•
Exchange catalyst.
•
Combustion gas line contaminated
Clean combustion gas line.
•
| OI/AO2000-EN REV. B
Reduce combustion air primary
pressure.
Increase combustion air primary
pressure
Reduce combustion gas primary
pressure.
Increase combustion gas primary
pressure.
Reduce sample gas inlet pressure
Increase the instrument air pressure
• Clean air jet injector (see page 281).
•
Reduce length of the gas discharge
line or increase cross-section.
Reduce instrument air pressure.