16 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
• The maximum combustion gas flow (see page 48) may not be exceeded.
• The combustion gas flow rate must be limited to a maximum of
10 l/h of H
2
or 25 l/h of H
2
/He mixture. For this purpose, the end user
has to provide suitable measures (see page 48) outside the gas analyzer.
• A shut-off valve (see page 48) must be installed in the combustion gas
supply line to increase the safety in the following operating states:
• Shutting down the gas analyzer,
• Failure of the instrument air supply,
• Leakage in the combustion gas feed path inside the gas analyzer.
This shut-off valve should be installed outside the analyzer house in the
vicinity of the combustion gas supply (cylinder, line).
• If there is no automatic shut-off of the combustion gas supply to the
gas analyzer in case of an instrument supply failure, a visible or audible
alarm must be triggered (see page 335).
• When measuring flammable gases, it must be made sure that in case of
a failure of the instrument air supply or of the analyzer module itself the
sample gas supply to the analyzer module is shut off and the sample gas
path is purged with nitrogen.
• The unobstructed exchange of air with the environment must be possi-
ble around the gas analyzer. The gas analyzer may not be directly cov-
ered. The openings in the housing towards the top and at the side may
not be closed. The distance to laterally adjacent built-in components
must be at least 4 mm.
• If the gas analyzer is installed in a closed cabinet, adequate ventilation
of the cabinet must be provided (at least 1 change of air per hour). The
distance to adjacent built-in components towards the top and at the
side must be at least 4 mm.
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