YOKOGAWA ADMAG AXR - Page 14

<3. INSTALLATION>
3-2
IM 01E30D01-01EN
(5) Precautions for Use of Liquid Sealing
Compounds
IMPORTANT
Care must be taken in using liquid sealing
compounds on the piping, as it may have a
negativeinuenceontheowindicationsby
owingoutandcoveringthesurfacesofan
electrode or grounding ring. In particular, care
must be taken if a liquid sealing compound is
used in the case of vertical piping.
(6) Service Area
Select locations where there is adequate space to
service installing, wiring, overhauling, etc.
(7) Bypass Line
It is recommended to install a bypass line to facilitate
maintenance and zero adjustment.
Bypass valve
Block valve
Block valve
F0303.EPS
Figure 3.1.3 Bypass Line
(8) Supporting the Flowmeter
CAUTION
Donotsecuretheowmeterseparatelyto
prevent the vibrations, shocks, and expansion
and contraction forces of the piping from
affectingit.Fixthepipesrst,thensupportthe
owmeterwiththepipes.
(9) Mounting Positions
• Pipesmustbefullylledwithliquids.
IMPORTANT
Ifthepipeisempty,theoutputuctuatesorthe
ProcessAlarm(SignalOverow)occurs.The
pipemustbefullylledwithliquid.
Piping shall be designed so as to maintain the
interioroftheowtubelledwithuids.
Vertical mounting is effective in such cases as
whenuidstendtoseparateorsolidmattermaybe
precipitated. When employing vertical mounting,
directtheuidsfromthebottomtothetoptoensure
thatthepipesremainfullylled.
F0304.EPS
(Incorrect)
(Correct)
(Incorrect)
(Correct)
h
h>0
h>0
h
Figure 3.1.4 Mounting Positions
• Avoidairbubbles.
IMPORTANT
If air bubbles enter a measurement pipe,
owrateindicationsmaybeaffectedand
measurement errors may be caused.
Incaseswhereuidscontainairbubbles,pipingmust
be designed to prevent them from accumulating in
themeasurementpipeofaowtube.
Ifavalveexistsneartheowmeter,trytomountthe
owmeter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.
Valve
(Incorrect)
(Correct)
(Incorrect)
(Correct)
F0305.ai
Figure 3.1.5 Avoiding Air Bubbles