IM 1E10D0-01E
3-3
3. INSTALLATION
(12) Grounding
IMPORTANT
Improper grounding can have an adverse affect
on the flow measurement. Please ensure that
the instrument is properly grounded.
The electromotive force of the magnetic flow tube 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 Flow Tube
and the Converter/Amplifier also need to be the same
as the measuring fluid. And moreover, that the poten-
tial must be the same with ground.
Please be sure to ground according to Figure 3.1.7.
600 V vinyl insulated
electric cable
(2mm
2
or larger)
Earth ring
F030107.EPS
Grounding
resistance 100
Ω
or less
Note: See “3.4.1 Grounding” for
information on grounding.
In case earth rings are not used.
(Available only for metal piping)
In case earth rings are used.
Figure 3.1.7
Grounding
3.2 Handling Precau-
tions
WARNING
The Magnetic Flow tube is a heavy instrument.
Please be careful to prevent persons from
injuring when it is handled.
3.2.1
General Precautions
(1) Precaution for Carrying
The Magnetic Flow Tube is packed tightly. When it is
unpacked, please give attention to prevent damages to
the flow tube. And to prevent the accident during carry
to the installing location, please carry it near the
location keeping packed as it delivered.
CAUTION
In case the Magnetic Flow Tube without eye-bolt
lifts up, please refer to Figure 3.2.1. Please
never lift up by using a bar through the flow
tube. It damages liner severely.
F030201.EPS
Figure 3.2.1
Vertical Lifting Sling Rigging Method
(2) Precaution for Shock
CAUTION
Care should be taken not to drop the flow tube
or subject it to excessive shock. This may lead
to liner damage which will cause inaccurate
readings.
(3) Flange Protection Covers
IMPORTANT
Please keep the protection cover (ex. corrugated
paper or anything possible to protect) attached
with flange except when mounting to the pipe.
(4) Terminal Box Cover
IMPORTANT
Please never leave the terminal box cover open
until wiring to prevent insulation deterioration.
NOTE
The terminal box cover is locked by special
screw. In case of opening the terminal box
cover, please use the Hexagonal Wrench
attached.
