ABB ACX Commissioning Instruction page 62

Analyzer System: Seal Integrity Check
When is the seal
integrity check needed?
Seal Integrity Check of
Analyzer System
without VOC Analyzer
Seal Integrity Check of
Analyzer System
with VOC Analyzer
62
CAUTION!
Prior to performing any maintenance works on the analyzer system be sure to
activate the "Maintenance Mode" on the "Control Panel" screen (see page 70) thus
setting the "Maintenance Mode" status signal.
Be sure to reset this setting after finishing the maintenance work.
The seal integrity check must be performed regularly. It must be performed in any
event when the respective status message is displayed.
The seal integrity check methods differ depending on whether a VOC analyzer
(AO2000-Fidas24) is installed in the analyzer system.
The seal integrity check should be performed according to the pressure-drop method
using a U-tube manometer when no VOC analyzer is installed in the analyzer system.
Step Action
1 Interrupt the sample gas supply.
2 Close the sample gas outlet.
3 Disconnect the sample gas line from the sample gas inlet and connect a
tee fitted with a shut-off valve.
4 Connect a U-tube manometer half filled with water to the free end of the
tee.
5 Blow air or nitrogen through the shutoff valve to a gauge pressure of p
100 hPa (= 1000 mm water column).
6 Close the shut-off valve. The pressure should not change measurably in
1 minute (pressure drop ≤ 1 hPa). A sharp pressure drop is a sign of a leak.
When a VOC analyzer is installed in the analyzer system,
• disconnect the sample gas line which runs to the other gas analyzers from the
AO2000-Multi-FID14 sample gas connection and
• perform the seal integrity check for the analyzer system without the AO2000-Fidas24
according to the pressure-drop method described above.
The sample gas path in the AO2000-Fidas24 cannot be checked for seal integrity.
ACX Analyzer System Commissioning Instruction
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Continued on next page
CI/ACX-EN Rev. D