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<4. Wiring>
38
IM 01E25A01-01EN
(4) Grounding
WARNING
For the wiring of protective grounding, terminate the
cable finish with round shaped crimp terminal with
insulation cover (for M4 screw), and connect it to the
proctective grounding terminal reliably.
CAUTION
The grounding should satisfy Class D requirements
(grounding resistance, 100 Ω or less).
IMPORTANT
Improper grounding may result in an adverse effect on
the flow measurement. Ensure that the instrument is
properly grounded.
The electromotive force of the magnetic flowmeter is
minute and it is easy to be affected by noise. Therefore,
be sure to ground according to Figure 4.5.6. The reliable
grounding equalize the reference electric potentials
(terminal potential) of the sensor and the transmitter, the
measuring fluid potential and the ground potential, and
then reduce the affection by noise.
The grounding rings make a connection between the measured
fluid and the ground and protects the flared face of lining.
Grounding rings are supplied with the instruments when
specified with dedicated optional code.
•
Grounding Resistance:
100 Ω or less (Class D requirements)
600 V vinyl-insulated cable
Cable cross section area:
2 mm
2
or larger
F0445.ai
In case grounding rings
are used.
In case grounding rings are not used.
(Available only for metal piping)
Figure 4.5.6 Grounding (Remote Sensor)
(5) Installing the Cover
Install the cover to the terminal box by turning it
clockwise. Tighten the cover locking screw (1) (See
Figure 4.5.1) counterclockwise using a hexagonal
wrench (nominal size 3) to lock the cover.