AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B 283
Fidas24: Checking the combustion gas supply line for seal integrity
CAUTION
The seal integrity test described in this section should only be performed
by qualified and specially trained personnel.
If these conditions are not provided or the prescribed materials are not
available, a seal integrity test must be carried out by ABB after sales ser-
vice.
Regular seal integrity check of the combustion gas supply line
The seal integrity of the combustion gas supply line must be checked regu-
larly according to one of the two following instructions, depending on
whether the combustion gas is supplied from a cylinder or from a central
unit.
Combustion gas 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 to 1.1 x the normal pressure of the
combustion gas, i.e. approx. 1.4 bar.
3 Mark cylinder pressure indication on the high pressure gauge.
4 Close the valve of the combustion gas cylinder.
5 The display on the high pressure gauge – it should not change measura-
bly in 10 minutes.
A measurable change in the display is an indication of a leak in the
combustion gas feed path, between the cylinder pressure reducer and
the combustion gas inlet valve of the gas analyzer. In this case, the fol-
lowing measures must be taken:
1 Check the combustion gas line between the cylinder and gas analyz-
er with a leak-detecting 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 a leak cannot be found in the combustion gas line, the combustion
gas inlet valve of the gas analyzer is leaking. In this case, the gas an-
alyzer may not be returned to service on any account! The combus-
tion gas inlet valve must be replaced by ABB Service.
6 After conclusion of the seal integrity test, set the combustion gas pres-
sure to normal pressure again, i.e. 1.2 bar.
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