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ML442 | v5k
Expo Technologies UK
T: +44 (0) 20 8398 8011
Expo Technologies US
T: +1 (440) 247 5314
Expo Technologies China
T: +86 532 8906 9858
6. Maintenance of the System
The maintenance recommended for the system consists of the following items, supplemented
by any additional local requirements imposed by the local Code of Practice. Expo recommends
that the commissioning tests be repeated at least every six months.
In addition the following checks are also recommended at that time:
Check the RLV and all Spark Arrestors. Remove all debris & corrosion, or replace with a
spare.
Check the condition of the air supply filter element. Clean or replace it as necessary.
At least every two years check the following additional items:
Apparatus is suitable for the Hazardous Location
There are no unauthorised modifications
The air supply must be to the correct quality, refer to section Air Quality
The interlocks and alarms function correctly
Approval labels are legible and undamaged
Adequate spares are carried
The action on pressure failure is correct
Pressure sensor calibration
If it is decided that the minimum pressure /purge flow sensor needs recalibrating it must be
returned to Expo for this service.
Filter cleaning
If the filter element needs cleaning the filter bowl can be unscrewed and removed. The filter
element also unscrews and can then be cleaned in soapy water. Do not use solvents on any
part of the filter assembly.
