Maintenance 117
Combustion gas supply from a central unit
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 pressure indication on the gauge of the pressure reducer.
4 Shut off the combustion gas supply.
5 Observe the display on the pressure gauge – 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 pressure reducer and the
combustion gas inlet valve of the gas analyzer. In this case the
following measures are to be taken:
1 Check the combustion gas line between the pressure reducer 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.
2 If no leak is found that means the gas analyzer combustion gas
inlet valve is leaky. In this case, the gas analyzer may not be
returned to service on any account! The combustion gas inlet
valve must be replaced by ABB Service.
6 After conclusion of the seal integrity test, set the combustion gas
pressure to normal pressure again, i.e. 1.2 bar.
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