Handling Precautions; General Precautions - YOKOGAWA AXG1A Installation Manual

(9) Mounting Positions
 Pipes must be fully filled with liquids.
IMPORTANT
It is essential that pipes remain fully filled at all times,
otherwise flow rate indications may be affected and
measurement errors may be caused.
Piping shall be designed so as to maintain the interior of
the sensor filled with fluids.
Vertical mounting is effective in such cases as
when fluids tend to separate or solid matter may be
precipitated. When employing vertical mounting, direct
the fluids from the bottom to the top to ensure that the
pipes remain fully filled.
(Correct)
h
h>0
(Correct)
h
h>0
Figure 3.1.4 Mounting Positions
 Avoid air bubbles.
IMPORTANT
If air bubbles enter a measurement pipe, flow rate
indications may be affected and measurement errors
may be caused.
In cases where fluids contain air bubbles, piping must
be designed to prevent them from accumulating in the
measurement pipe of a sensor.
If a valve exists near the flowmeter, try to mount the
flowmeter on the valve's upstream side in order to
prevent a possible reduction of pressure inside the pipe,
thereby avoiding the possibility of air bubbles.
(Correct)
(Correct)
Valve
Figure 3.1.5 Avoiding Air Bubbles
 Mounting orientation
(Incorrect)
Figure 3.1.6 Mounting Orientation
(Incorrect)
3.2
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3.2.1 General Precautions

(1) Precaution during Transportation
The magnetic flowmeter is packed tightly. When
it is unpacked, pay attention to prevent damaging
(Incorrect)
the flowmeter. To prevent accidents while it is being
transported to the installing location, transport it to the site
in its original packing.
(Incorrect)
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<3. Installation>
IMPORTANT
If electrodes are perpendicular to the ground, air
bubbles near the top or precipitates at the bottom may
cause measurement errors. Ensure that the terminal
box of a remote sensor and transmitter of an integral
flowmeter are mounted above the piping to prevent
water from entering them.
(Correct)
(Incorrect)
Air bubble
Electrode
Electrode

Handling Precautions

WARNING
The magnetic flowmeter is a heavy product.
Be careful that no damage is caused to personnel
through accidentally dropping it, or by exerting
excessive force on the magnetic flowmeter. When
moving the magnetic flowmeter, always use a trolley
and have at least two people carry it.
NOTE
This section describes the remote sensor as an
example. The same attention must be paid to the
integral flowmeter.
11
(Incorrect)
Air bubble
Water can
Precipitate
seep into
the terminal
box.
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IM 01E24A01-01EN
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