192
EL3000
CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
… 13 Maintenance
Dichtigk
Check the integrity of combustion gas path
DANGER
Explosion hazard
Explosion hazard due to improper leak tightness test.
• The leak tightness check may be carried out by qualified
and specially trained persons only.
• If these conditions are not provided or the prescribed
materials are not available, a seal integrity test must be
carried out by ABB Service.
Check the tightness of the combustion gas line
The seal integrity of the combustion gas feed line must be
regularly checked in accordance with the two following
instructions, depending on whether the combustion gas is
offered from a bottle or a central supply.
Combustion gas supply from a cylinder
1. Switch off the gas analyzer power supply. Ensure that the
shut-off valve in the combustion gas supply line is open.
2. Set the combustion gas pressure at 1.1 x the normal pressure
of the combustion gas, i.e. at approx. 1.4 bar.
3. Mark bottle pressure display on the high-pressure
manometer.
4. Close the valve of the combustion gas bottle.
5. Observe the display on the high-pressure manometer – it
should not change measurably in 10 minutes.
• A measurable change in the display is an indication of a
leak in the combustion gas path between the bottle
pressure reducer and the combustion gas inlet valve of
the gas analyzer.
In this case the following measures are to be taken:
– Check the combustion gas line between the bottle
and gas analyzer with a leak detection spray. A leak in
this area must be remedied and another leak test
must be performed before the gas analyzer is put into
operation again.
– If no leak is found, that means the gas analyzer
combustion gas inlet valve is leaky.
DANGER
Explosion hazard
Explosion hazard if there is a leak in the combustion gas inlet
valve.
If a leak is detected at the combustion gas inlet valve:
• Disconnect the combustion gas supply.
• Do not restart the gas analyzer.
• Have the combustion gas valve replaced by the ABB
Service team.
6. After conclusion of the seal integrity test, set the combustion
gas pressure to normal pressure again, i.e. 1.2 bar.
