Maintenance and Troubleshooting | 5-57
Disconnect Enclosure Flange Flamepath (Joining Surfaces)
Any time the Ex d Disconnect Enclosure is opened, inspect the flamepath
for scratches, indentations, or other damage.
The minimum flamepath length must be at least 38 mm and flat (0.05 mm
or better) and a maximum surface roughness of 6.3 µm or less. When the
bolts are tightened, the gap must not exceed 0.15 mm. Use A2 stainless
steel fasteners with yield stress ≥450 MPa (65,300 psi).
If it is necessary to use a cleaning agent, make sure the power to the
analyzer is off. Also, the agent must be nonabrasive and must not at-
tack aluminum (example, a suitable agent is Isopropanol). Following
any maintenance and/or cleaning – and after the cleaning fluid has
evaporated completely – immediately close the Disconnect Enclosure.
While the Disconnect Enclosure is open for maintenance or repair,
take extreme care to avoid scratching or damaging the joining surfaces
(flamepath).
If at any time the Disconnect Enclosure door is open but is not being
worked on, close and secure it with at least one screw. This will reduce
the risk of inadvertently scratching or damaging the flamepath.
Before closing the door, gently clean these areas with a soft, nonabra-
sive cloth and make sure they are free of debris.
Before opening the Disconnect Enclosure, follow all necessary safety
procedures to ensure the area is nonhazardous (main power to the
analyzer is off, explosive gas atmosphere is not present, etc.).
Before performing maintenance on the analyzer, shut off the power to
the analyzer and all alternate power supplies (if used).
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CAUTION
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WARNING
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CAUTION
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