Flowmeter Piping - YOKOGAWA AXG1A Installation Manual

CAUTION
In order to lift a magnetic flowmeter that is fitted with
eyebolts, proceed as in Figure 3.2.1. Never lift it using
a bar passed through the sensor as this damages the
lining severely.
When lifting the magnetic flowmeter in vertical position,
eyebolts (or eyenuts and bolts) are necessary. Attach
them to the flange bolt holes, and then lift the magnetic
flowmeter.
Horizontal position
Figure 3.2.1 Lifting Flowmeter
(2) Avoid Shocks from Impact
CAUTION
Care should be taken not to drop the flowmeter or
expose it to excessive shock. In particular, be careful
not to subject the flange surface to shock. This may
lead to lining damage which will result in inaccurate
readings.
(3) Flange Protection Covers
IMPORTANT
Keep the protective covering (i.e. the corrugated
cardboard or other cushioning material) and the
attached particle board (when PTFE lining is specified)
in place over the flange except when mounting the
flowmeter to the pipe.
(4) Terminal Box Cover
IMPORTANT
As it is possible that the insulation will deteriorate, do
not open the terminal box cover until it is time to wire it.
(5) Long-term Non-use
 Confirmation of sealing conditions for the
Confirm that the terminal box screw and cable entries
are well sealed. Equip the conduit piping with drain plugs
or waterproof glands to prevent moisture or water from
penetrating into the flowmeter through the conduit.
 Regular inspections
Inspect the sealing conditions as mentioned above, and
the inside of the terminal box at least once a year.
Also, due to rain, etc. when it is suspected that water may
have penetrated into the inside of the flowmeter, perform
supplementary inspections.
Vertical position

3.2.2 Flowmeter Piping

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(1) Correct any misaligned or slanted piping, and any
Figure 3.2.2 Slanted and Misaligned Flowmeter Piping
(2) Inside a newly installed pipeline, there may be some
<3. Installation>
IMPORTANT
It is not desirable to leave the flowmeter unused
for a long term after installation. If this situation is
unavoidable, take care of the flowmeter by observing
the following.
flowmeter
CAUTION
Misaligned or slanted piping can lead to leakage and
damage to the flanges.
gaps that may exist between mounting flanges before
installing the flowmeter (see Figure 3.2.2).
Slanted
foreign substances such as residue from welding
or wood chips. Remove them by flushing the piping
before mounting the flowmeter. This prevents the
lining from being damaged, as well as the occurrence
of erroneous measured signals resulting from foreign
substances passing through the sensor during
measurement.
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Misaligned
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