AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B 27
Special requirements for operation
Special requirements
• All cables must enter via the specified cable fittings and be sealed by
tightening the nuts in accordance with IP54. Cable connectors not in use
have to be closed with suitable vent plugs.
• If the installation site of the gas analyzer is hazardous,
• The external connectors on the analyzer module "Power supply
24 V DC" and "System bus" which are accessible without having to
open the system housing may not be plugged in or unplugged while
the power is on.
• The system housing may not be opened while the power is on.
Additional special requirements for operation with flammable sample gas
• The sample gas pressure in the gas analyzer must correspond to the
atmospheric conditions in all operational conditions and in the event of
faults (positive pressure ≤ 3 hPa).
• If pressurized enclosure fails (supply of purge gas to the purge curtain)
and an alarm is triggered, the fault must be corrected quickly. The gas
analyzer can remain in operation. If the fault cannot be eliminated
quickly, supply of the sample gas must be cut off.
• If the gas analyzer is not in operation, then the supply gases must be cut
off.
• Tests:
• At start-up, after failure of the pressurized enclosure and at regular
intervals, a test for proper functioning of the pressurized enclosure
must be conducted by a technically competent person. At this time,
the conditions stipulated in the section "Technical data" (see page
25) should be checked and established.
• The alarm output must be checked.
• The seal integrity of the sample gas path and purge gas path must
be checked at suitable intervals
• If the gas analyzer contains several analyzer modules, the pressurized
enclosure must be installed as well as monitored and checked separately
for each individual analyzer module. In the event of a fault, an alarm
must be triggered in each individual analyzer module.
NOTES
The pressurized enclosure (supply of purge gas to the purge curtain) and if
required, a housing purge must be provided separately.
The pressurized enclosure is not required if the gas analyzer is used to the
measure non-flammable gases.
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