Replacement Of The Flow Switch (If Fitted) - Michell Instruments Promet EExd User Manual

Promet EExd User's Manual
4.3

Replacement of the Flow Switch (if fitted)

1. Isolate the incoming sample gas line by CLOSING the sample inlet
isolation valve and allow the system to depressurize. NOTE: Always
refer to Appendix G.4 - Special Conditions of Safe Use.
2. Remove the enclosure window and mount the user interface as shown
in Section 4.1.
3. Restrain the flow switch assembly using an 11mm spanner to loosen
and remove the 2 off 1/8" sample pipe connections.
4. Disconnect the 2-wire cable connector from the flow switch to the main
circuit board.
5. Carefully pull the flow switch assembly out of the enclosure.
6. Replacement of the flow switch is simply a reversal of the above
procedure.
7. 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-energized.
Michell Instruments
The power to the enclosure must be turned off before any
work is carried out in the measurement system enclosure.
Observe de-energize durations.
MAINTENANCE
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