ABB ACF5000 Manual page 43

Combustion gas for the FID
Waste gas
CAUTION!
Purging gas for gas extraction probe
Compressed air supply for back-purging the gas extraction probe (option)
ACF5000 FTIR ANALYZER SYSTEM
 Connect two-stage cylinder pressure reducer with flow restrictor (ver-
sion for high purity gases) to the combustion gas cylinder.
 Connect combustion gas line to the bulkhead fitting provided.
For safety reasons (see page 11) a flow restrictor, which limits the com-
bustion gas flow to 10 l/h, is integrated into this bulkhead fitting.
This bulkhead fitting is a safety-relevant component. It may be replaced only
by certified service personnel!
 If the analyzer system is equipped with the option "Hydrogen monitor-
ing of the analyzer cabinet" (see page 18) connect the combustion gas
line to the inlet of the H
nected ex-works to the bulkhead fitting with integrated flow restrictor.
 Check the seal integrity of the combustion gas line: Set the high-
pressure stage of the pressure reducer of the combustion gas cylinder
to p = 1200 ± 100 hPa (1.2 ± 0.1 bar) and purge the combustion gas line.
e
Using a hydrogen leak detector (measuring principle: thermal conductiv-
ity) to check the seal integrity of the combustion gas line. Close the
combustion gas cylinder.
 Connect the gas discharge line (shortest possible line with largest pos-
sible internal diameter). Allow waste gas to discharge freely; do not in-
stall restrictions or shut-off fittings. The internal diameter of the gas
discharge line must be expanded as close behind the analyzer cabinet as
possible, in order to prevent dynamic air pressure on account of exces-
sive line length.
 Ensure air and condensate are separated after discharge. According to
the gas transport principle, the sample gas is diluted in a ratio of ap-
prox. 1:5 after being measured in the instrument air. Nonetheless, con-
densation can occur when the dew point of the water in the mixture has
reached ambient temperature.
The exhaust gas line on the measuring gas output needs to be laid in a falling
manner in any event. Otherwise, there is a danger that condensate forms
with corrosive components, which may result in leaks.
 Connect the purge gas line to the gas sampling probe (for emergency
purging (see page 150) and feeding test gas to the probe). The purge
gas line can be laid on the same tray as the sample gas line.
 Connect compressed air for cleaning the sampling filter and the probe
tube (back-purging option, see page 159) to the corresponding connec-
tions on the probe's protective box.
| OI/ACF5000-EN REV. A
safety valve. The outlet of this valve is con-
2
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