12 | Baker Hughes
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9. MAINTENANCE AND SERVICE
9.1. General rules
These operations must be put into service in conformance with
EN/IEC 60079-17
and
/
or
national and local regulations applicable for explosive atmospheres.
9.2. Before maintenance activity
Before carrying out any work on the device, check the local conditions are free of potentially
explosive atmosphere for safe opening of the covers.
9.3. During maintenance activity
•
Take into account all special conditions of use listed
•
Pay particular attention to the following points:
➢
Check that no part of the type 12400 is damaged. In the event of damage, replace the
defective parts with genuine manufacturer's replacement parts only.
➢
Check that the pressure limiting plug at the back of the mechanism compartment (
rep
190
) and its spongy gasket (
rep 192
) are presents without any damage.
➢
Check the main cover seal (
rep 109
), the terminal compartment seal (
rep 105
) and
the mechanism compartment seal (
rep 108
) are free of any damage.
➢
Check the 12400 housing and the magnet assembly (
rep 50
)
inside the mechanism
compartment are free of any damage.
➢
Check the gland and the electrical connections.
➢
To proceed to a cleaning of the different sides of the enclosure to avoid the deposits of
dusts for instruments working in zones 20, 21 and 22.
9.4. After maintenance activity
After doing any work on the device, check the covers are fully screwed (
rep 104, 107, 255
and 280
) and the security cover screws are well locked (
rep 106, 110 and 257).