Manual FLOW 38 Page 15 (total 54) COMAC CAL s.r.o.
Earthing rings
Using for a plastic pipeline or in case of metallic pipelines with internal plastic lining turned up or pulled
out to the front faces of the pipeline flanges. Conductive earthing rings of stainless steel create
conductive connection with the measured substance. Usually, potential equalization is carried out by
means of the reference earthing electrode in the measuring tube. In exceptional cases, the equalizing
currents may run through the reference electrode based on the device earthing conception. This may lead
to deterioration of the sensor, e.g. by electrochemical disintegration of the electrodes. In such cases, it is
necessary to use the earthing rings for potential equalization. This holds true for two-phase or two-
component flows in which the medium is blended badly or its components cannot be blended. In general
it can be said that using the earthing rings is always the protection against stray currents and the warranty
of correct measurement at the same time.
The flow sensor is provided with the earthing screw of stainless steel for the earthing cable supplied with
the mounting accessories. Then this cable must be conductively connected with the earthing rings.
The earthing rings are not part of our standard package and must be ordered separately. Chemical
durability of the material must correspond with the liquid to be measured; it is usually made of the same
material as the sensor electrodes. While mounting, it is necessary to insert seals in both sides of the
earthing ring and take care that no part extends to the internal profile of the sensor (whirling and
turbulence of the medium).
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