YOKOGAWA AXFA14G - Page 12

<3. Installation>
11
IM 01E20A01-01EN
*: To be provided by user
F0311.ai
*Mounting base
Gasket
Connecting fitting
Union joint nut
*Piping
Horizontal mounting
F0312.ai
Vertical mounting
F0313.ai
Figure 3.3.1 Mounting Procedure for Union Joint Type
(sizes: 2.5 to 10 mm (0.1 to 0.4 in.))
3.3.2 Nominal Diameter 2.5 mm (0.1 in.) to
40 mm (1.5 in.), Wafer Type
IMPORTANT
Useboltsandnutsincompliancewiththeange
ratings. When stud-type through-bolts are used, be
sure the outside diameter of the shank is smaller than
that of the thread ridge. Be sure to choose a gasket
with inner and outer diameters that does not protrude
inside the piping (refer to Table 3.3.16). If the inner
diameter of the gasket is too large, or outer diameter
ofthegasketistoosmall,uidleakagemayresult.
(1) Mounting Direction
Mounttheowmetersothattheowdirectionoftheuid
to be measured is in line with the direction of the arrow
markontheowmeter.
IMPORTANT
If it is impossible to match the direction of the arrow
mark, the direction of the electrical connection can
be changed. Refer to the applicable user’s manuals
which can be downloaded from our website.
Incasetheuidbeingmeasuredowsagainstthe
arrowdirection,changethevaluefrom“Forward”to
“Reverse”attheparameter[J20:FlowDirection]
(refer to Chapter 8).
(2) Mounting Centering Devices
Tomaintainconcentricityoftheowmeterwiththe
pipes,installcenteringdevicesontheMini-angesof
theowmeter.Usetheappropriatecenteringdevices
accordingtothenominaldiameterandtheangeratings.
(3) Positioning the Flowmeter
Pass two through-bolts through the adjacent holes of
bothangesandpositiontheowmetersothattheMini-
angesandthecenteringdevicescomeinclosecontact
with each other. Pass the other through-bolts through
the other holes (refer to Figure 3.3.2 and Figure 3.3.3).
In case stud-type through-bolts are used, position them
in such a way that the centering devices come in contact
with the bolt threads.
(4) Tightening Nuts
Tighten the nuts according to the torque values for metal
piping in Table 3.3.4. For PVC piping, select an optional
code of GA, GC, or GD, use rubber gaskets and tighten
the nuts to the torque values for PVC piping in Table
3.3.5.
Forpermeableuids(suchasnitricacid,hydrouoric
acid, or sodium hydrate at high temperatures), tighten the
nuts according to the torque values in Table 3.3.6.
CAUTION
ForaowmeterwithuorocarbonPFAlining,itis
possible that the nuts may loosen as time passes,
so tighten them regularly. Be sure to tighten the nuts
according to the prescribed torque values. Tighten
them diagonally with the same torque values, step by
step up to the prescribed torque value.
Installation
3