100 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Fidas24: Connecting the combustion gas line
Connecting the combustion gas line
Cleaning the combustion gas line
1 Pump cleaning agent (alkaline cleaner, stainless steel pickling agent)
through the stainless steel tube.
2 Thoroughly rinse the tube with distilled water.
3 Purge the tube for several hours at a temperature of > 100 °C with syn-
thetic air or with nitrogen (10 to 20 l/h).
4 Seal the ends of the tube.
Connecting the combustion gas line
5 Connect a two-stage cylinder pressure reducer (version for high purity
gases) to the combustion gas cylinder.
6 Connect the combustion gas line to the cylinder pressure reducer.
7 Install a flow restrictor in the combustion gas supply line which restricts
the combustion gas flow to 10 l/h of H
2
or 25 l/h of H
2
/He mixture. This
means that operation of the gas analyzer is safe even with a defect in
the combustion gas feed path (e.g. leaks).
8 Install a shut-off valve in the combustion gas supply line. It is recom-
mended that a pneumatic valve is installed; this valve must be controlled
by the instrument air supply in such a way that the combustion gas feed
is automatically shut off if the instrument air supply fails (see page 335)
(and the continuous housing purge therefore fails).
9 Connect (see page 83) the combustion gas line to the combustion gas
inlet of the analyzer module via a pressure regulator (0 to 1.6 bar).
Check the seal integrity of the combustion gas line
10 Check (see page 283) the seal integrity of the combustion gas line after
connection.
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