Yokogawa ADMAG AXW - Manual (Page 13)

<3. INSTALLATION>
3-4
IM 01E25D11-01EN
• Confirmation of sealing conditions for the
flowmeter
Confirm that the terminal box screw and wiring ports
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
flowmeter perform supplementary inspections.
3.2.2 Flowmeter Piping
CAUTION
Misaligned or slanted piping can lead to leakage
and damage to the flanges.
(1) Correct any misaligned or slanted piping, and
any gaps that may exist between mounting
flanges before installing the flowmeter (refer to
Figure 3.2.2).
Slanted
F0308.ai
Misaligned
Figure 3.2.2 Slanted and Misaligned Flowmeter
Piping
(2) Inside a newly installed pipeline, there may
be some 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
flowtube during measurement.
3.3 Mounting Procedures
CAUTION
When attaching optional grounding rings to
the flowtube with lining material natural hard
rubber or fluorocarbon PTFE, gaskets must be
placed between each grounding ring and the
flowtube. Fluid leakage will happen without these
gaskets. These gaskets are to be supplied by
customer. Do not forget those gaskets also when
ordering and attaching the grounding rings later
additionally.
NOTE
The tightening torque value varies depending
on the type of lining and gasket as shown in the
tables in this section.
IMPORTANT
Use bolts and nuts in compliance with the flange
ratings. When choosing the gaskets, be sure to
choose sheet gaskets designed to fit for flange
standard.
(1) Mounting Direction
Mount the flowmeter so that the flow direction of
the fluid to be measured is in line with the direction
of the arrow mark on the flowmeter. It may be
especially difficult to move large size flowtubes after
bringing them into the pit. Check directions before
bringing.
IMPORTANT
If it is impossible to match the direction of
the arrow mark, the direction of the electrical
connection can be changed. Refer to Section 5.1
to do this properly.
In case the fluid being measured flows against
the arrow direction, refer to the parameter J20:
Flow Direction in the user’s manual of the
AXFA11 Magnetic Flowmeter Remote Converter
(IM 01E20C01-01E).