Chapter 6 | Maintenance
Maintenance primarily comprises changing any sensors that no longer meet
their initial metrological characteristics.
Since they are liable to affect detection reliability, the tasks
described in this chapter are reserved for authorized trained
personnel only.
Inspection and maintenance shall be carried out in accordance
with standards EN60079-17 or IEC 60079-17, with whatever
editions are in force or with other national standards.
The 4 mA level is factory-set. This value cannot be changed or
adjusted. This check does not concern explosimeter OLC 100.
Opening the cover
This stage is necessary for the 4 mA check, zeroing, and calibration of the
detector. Unscrew the lid of the enclosure by using a tool positioned like a cross.
. All the necessary steps should be taken before opening the lid of
the enclosure if it is installed in an ATEX zone, in particular:
A fire permit from the appropriate department.
Continuous use of a portable explosimeter.
Use of an intrinsically safe multimeter.
Reduction to an absolute minimum of the time involved.
This observation does not concern intrinsically safe versions that
are used in an ATEX gas zone (see Chapter 11 | Specific
instructions for use in explosive atmospheres and operational
safety).
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