Yokogawa ADMAG AXR Manual do Utilizador descarregar pdf (Página 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

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

nterior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>0

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

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 193 194

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