IM 01E20D01-01E
4-14
4. WIRING
(5) Grounding
CAUTION
Be sure to connect the protective grounding of
the AXF remote flowtube with a cable of 2mm
2
or larger cross section in order to avoid electrical
shock to the operators and maintenance engi-
neers and to prevent the influence of external
noise.
Connect the grounding wire to the
mark.
The grounding should satisfy Class D require-
ments (ground resistance, 100
or less).
In case of TIIS Flameproof type, the grounding
should satisfy Class C requirements (ground
resistance, 10
or less) or class A requirements
(ground resistance, 10
or less).
For explosion proof type except TIIS, follow the
domestic electrical requirements as regulated in
each country.
IMPORTANT
Improper grounding can have 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. And also
that reference electric potential is the same as the
measuring fluid potential. Therefore, the reference
electric potential (terminal potential) of the flowtube
and the converter also need to be the same as the
measuring fluid. Moreover, that the potential must be
the same with ground. The magnetic flowmeter is
equipped with an grounding ring that makes a connec-
tion with the charge of the measured fluid for ground-
ing and protects the lining.
Be sure to ground according to Figure 4.2.15.
• Class D requirements (ground resistance.
100
or less).
• TIIS Flameproof type: Class C requirements
(ground resistance, 10
or less) or Class A
requirements (ground resistance, 10
or less)
• Explosion proof type except TIIS: Domestic
electrical requirements as regulated in each
country.
Grounding ring
600 V vinyl insulated
electric cable
(2 mm
2
or larger)
F0430.EPS
In case grounding rings
are used.
In case grounding rings are
not used.
(Available only for metal piping)
Figure 4.2.15 Protective Grounding Terminal Location
(6) Installing the Cover
Install the cover to the flowtube by turning it in the
direction of the arrow as shown below. Tighten the
cover locking screw counterclockwise using a hexago-
nal wrench (nominal size 3) to lock the cover.
F0431.EPS
Figure 4.2.16 Installing the Terminal Box Cover (Remote
Flowtube)