Tecfluid FLOMID Series - Manual (Page 6)

SENSOR EARTH CONNECTION (only for sandwich and flange mounting sensors )
To obtain correct operation the sensor should have its functional earth connected to a point that is
in direct contact with the liquid to be metered.
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.
In the case that there are high voltage differences between different earth points, this will cause
currents that may give problems in the readings (empty pipe indication). In these cases, do not
connect the functional earth to the protective earth of the mains.
6
Tightening torque
The tightening torque for the flange bolts should not exceed 32 Nm for working pressures of 16
bar maximum.
This tightening torque should be applied to sandwich mounting (Flomid 0FX) and also to DIN,
ANSI, JIS etc. flange mounting sensors for the same working pressure of 16 bar.
The maximum tightening torque varies in function of the nominal pressure (PN) of the sensor.
The tightening of the bolts should be uniform, following the sequence shown in the drawings and
depending on the number of flange bolts.