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5.3
Sensor earth connection
To obtain correct operation the sensor should have its functional earth connected to a point
that is in direct contact with the liquid whose flow rate wants to be measured.
The earth cables should assure a good electrical contact. To obtain this, they should be well
screwed down and with a good contact on both sides of the sensor. It is important to
eliminate paint or coverings that act as insulation of the connection.
The functional earth connection should be used exclusively for the sensor given that parasitic
signals caused by other electrical equipment connected to this earth can cause malfunction
of the sensor.
The connection of the functional earth should be made as follows:
a)
In the case of metallic pipes without internal lining connect the earth cables to the
counter flanges.
b)
In the case of metallic pipes with internal lining or plastic pipes, connect the earth
cables to the earthing rings, supplied on request.
The earth rings are necessary when installing in non-metallic pipes or in metallic pipes with
internal insulating liner (PTFE, PVDF, PP, EBONITE, etc.).
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