Maintenance; Enclosure Cover And User Interface - Michell Instruments Promet EExd User Manual

MAINTENANCE

4 MAINTENANCE
The design of the Promet EExd sensor cell and measurement system is such that no
specific routine maintenance is required. If, however, a fault does occur with your
system that is not covered within this manual please contact Michell Instruments (www.
michell.com) or your local representative.
4.1

Enclosure Cover and User Interface

The enclosure cover is part of the flameproof protection for the enclosure and has an
IP66 rating. It should be firmly closed to ensure flameproof integrity and continued
environmental protection. For prolonged and easy operation ensure that the threads
are always lubricated with a light grease. A grub screw is used as a locking device. This
should be loosened before unscrewing the cover counter-clockwise.
The user interface assembly uses two ¼ turn bayonet style fasteners to secure it. These
are finger operated and should be turned clockwise to lock and counter-clockwise to
release. The user interface, once disconnected from the two ¼ turn fasteners, can
be temporarily re-positioned on the instrument by securing the right-hand fastener
in the left-hand mount. This will situate the interface assembly in an overhanging
position outside of the enclosure allowing greater access. If there is insufficient space
to accommodate the overhanging user interface assembly on the left-hand side, it may
be rotated 180° (upside down) and placed on the right-hand side.
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The power to the enclosure must be
turned off before any work is carried out
in the measurement system enclosure.
Observe de-energize durations.
Gas line connections to the measurement
system must be isolated and de-pressurized
before any work commences.
Before powering up the instrument
the "Start-Up Purge Procedure" must
be carried out. See Section 2.6.
To ensure the full requirement of this product's safety
certificate is maintained, any loosened or disturbed
tubework or couplings must be subject to a gas
pressure test and appropriate leak check at 1.5x the
max operating pressure before the full product is re-
Promet EExd User's Manual
energized.
97090 Issue 16.1, November 2019