EXPO D760-ET MiniPurge, Руководство пользователя

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ML548 | v11
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24.To test the CLAPS settings, create a leak in the system by removing a bolt or losening a gland plate
in order to create a 15mm hole. Remember to replace bolt or retighten gland plate after testing.
25.The setting of the CLAPS Sensor is factory calibrated to the normal working pressure expected in the
pressurized enclosure, typically 10 mbarg. The pressure in the pressurized enclosure should be stabilized
as close as possible to this figure. This can be checked by a manometer attached to the minimum pressure
sensor.
26.Remove the air supply to the system, remove all test equipment and replace all plugs.
Normal Operation
For normal operation of the system, after commissioning has been carried out it is possible to turn the air
supply valve on or off to start or stop the system. After this, the purge and pressurization sequence is
automatic.
Section 8: Maintenance of the System
General maintenance
The maintenance of the system outlined in this manual should be supplemented with any additional
requirements set out in appropriate local codes of practice.
The following checks should be carried out every 6 – 36 months dependent on environment according
to IEC / EN 60079-17
• Tests outlined in the Detailed Commissioning section.
• Ensure that the Relief Valve Unit is free from contamination prior to making any adjustment. To do this:
• Remove large cover plate using a 8 mm spanner (wrench).
• Check that the interior and all components are clean and free from contamination.
• Replace large cover plate.
• Check the condition of the air supply filter element. Clean or replace as necessary.
Additional maintenance checks
The following additional checks are recommended at least every 3 years:
Check that:
• Apparatus is suitable for use in the hazardous location.
• There are no unauthorised modifications.
• The air supply is uncontaminated.
• The interlocks and alarms function correctly.
• Approval labels are legible and undamaged.
• Adequate spares are carried.
• The action on pressure failure is correct.
Maintenance of Electronic Timer
This should be carried out every 3 years.
• The intrinsically safe battery pack associated with the electronic timer should be replaced and the
commissioning tests repeated.
• After the timing phase has elapsed, the battery may be hot-swapped in the hazardous location without
affecting the operation of the MiniPurge
®
system