Ametek 933S, Operator'S Manual

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Maintenance and Troubleshooting
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6-59
Upper/Lower Electronics Enclosure Flamepaths (Joining Surfaces)
Any time either Ex d (Upper or Lower) Electronics Enclosure is opened for
maintenance, inspect the enclosure flamepaths for scratches, indentations,
or other damage. Carefully clean the flamepaths (joining surfaces) with a
soft, nonabrasive cloth before closing it.
Before opening the analyzer’s Ex d Upper/Lower Enclosure, follow all
necessary safety procedures to ensure the area is nonhazardous (main
AC power to the analyzer is off, explosive gas atmosphere is not pres-
ent, etc.).
Before performing maintenance on the analyzer, shut off main AC
power and all external power supplies (if used) to the analyzer.
When the Ex d Upper/Lower Enclosure is opened for maintenance or
repair, take extreme care to avoid scratching or damaging its flamepaths.
If at any time the enclosure door is open and service personnel are
not working on the Ex d Upper/Lower Enclosure, close the door and
secure it with at least one screw. This will reduce the risk of inadver-
tently scratching or damaging the flamepath.
Before closing the door, gently clean the flamepath with a soft, non-
abrasive cloth and make sure the surfaces are free of debris.
If it is necessary to use a cleaning agent, make sure the AC power to the
analyzer is off. Also, the agent must be nonabrasive and must not attack
aluminum (a suitable agent is Isopropanol). Following any mainte-
nance and/or cleaning – and after the cleaning fluid has evaporated
completely – immediately close the Ex d Upper/Lower Enclosure.
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CAUTION
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WARNING
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WARNING