User's Manual AXF Magnetic Flowmeter Integral ... - Yokogawa

3. INSTALLATION
(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
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.
Figure 3.2.2
Slanted
Misaligned
F0308.EPS
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.
• 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).
3.3 Mounting Procedures
NOTE
• The tightening torque value to which gaskets
must be tightened varies depending on the
type and external dimensions of the lining and
the gasket. In this section, the tables indicating
tightening torque values include the corresponding
gasket types. The internal diameters
of the gaskets are close to those of the grounding
rings.
• For fluids capable of potentially permeating
PFA linings (such as nitric acid, hydrofluoric
acid, or sodium hydrate at high temperatures),
different tightening torque values must be
applied. The tables of these torque values is
indicated in this section.
• For replacement models for the earlier ADMAG
or ADMAG AE, the tightening torque values in
the tables can be applied if their process
connections, the lining types, and the nominal
sizes are the same.
3.3.1 Nominal Diameter 2.5 mm (0.1
in.) to 10 mm (0.4 in.), Union
Joint Type
Ceramics linings with diameters of 2.5 (0.1), 5 (0.2), or
10 mm (0.4 in.) are connected using union joints. Weld
or screw the connecting fittings in Table 3.3.1 onto the
piping. The external dimensions of the fittings are
shown in the table.
3-4
IM 01E20D01-01E