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10DS3111A INSTRUCTION MANUAL
5. The liners of magnetic flowmeters may become covered with conductive coatings (as
well as with the more well known insulating types). The presence of a conductive coating
will cause the electrode measurements outlined in procedures "3" and "4" above to
appear faulty. If a coating is evident inside the magnetic flowmeter, it should be removed
using a solvent compatible with the lining material or with a brush. Be extremely careful
not to damage the liner when using either cleaning method.
Before returning the meter to service, verify that there is electrical continuity between the
electrode tips and their meter field wiring connections. A resistance of either 36 Kohms or
100 Kohms will be in series with each electrode so make certain to set the ohmmeter to
the appropriate scale.
6. If measurement of both electrodes indicate an infinite resistance reading, the meter
may then be returned to on-stream operation after wiring has been restored and the cover
installed.
6-4
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