OPERATING INSTRUCTIONS FOR THE EXPLOSION-PROTECTED DESIGN
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Manual EMC 500 · EN01 · 2008-02
9
Maintenance
Explosion-protected electrical control systems must be subjected to maintenance at regular
intervals.
These intervals depend on the operating and environmental conditions. We recommend that you
check the system at least once a year (possibly in conjunction with the annual official verification of
the EMC 500).
Safety Measures
In areas subject to explosion hazards, work is generally prohibited on voltage-carrying electrical
apparatus (except for intrinsically safe circuits).
In special cases, it is possible to carry out work if it is guaranteed that there is no explosive
atmosphere.
This can only be done if there are explosion-protected and approved measuring instruments
involved.
Maintenance Work
Since explosion-proof enclosures are protected against water only to a limited extent due to the
flameproof joint (IP 54), you must check for water collecting inside the enclosure.
Rusted joints must not be cleaned using abrasives or wire brushes, but should only be cleaned
chemically, for example with reducing oils.
Then joints must be protected thoroughly with acid-free anticorrosive agents, e. g. ESSO RUST BAN
397, Mobil Oil Tecrex 39 or equivalent agents.
The seal of the intrinsically safe (Ex-e) enclosure must be checked for damage and replaced, if
necessary.
Check cable glands and stoppers for tight fit.
Damage to the enclosures can terminate the explosion protection!
Repairs
If repairs are done to components of the device which are essential for explosion protection, such
components must first be checked by an acknowledged expert before you can put them into
service again.
If repairs are done by the manufacturer, they need not be approved by an expert.
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