Yokogawa ADMAG AXR Uživatelský manuál stáhnout pdf (Strana 13)

<3. INSTALLATION>

3-1

IM 01E30D01-01EN

3. INSTALLATION

3.1 Piping Design Precautions

WARNING

Installationofthemagneticowmetermust

be performed by expert engineer or skilled

personnel. No operator shall be permitted to

perform procedures relating to installation.

IMPORTANT

Design piping correctly, referring to the following

topreventdamagetoowtubesandtoassure

accurate measuring.

(1) Location

IMPORTANT

Installtheowmeterinalocationwhereitis

not exposed to direct sunlight. The minimum

ambient temperature is limited by the minimum

uidtemperatureoftheowtube.Formore

information, refer to Chapter 11 “OUTLINE.” The

owmetermaybeusedinanambienthumidity

where the relative humidity ranges from 0 to

100%. However, avoid long-term continuous

operation at relative humidity above 95%.

(2) Noise Avoidance

IMPORTANT

Theowmetershouldbeinstalledawayfrom

electrical motors, transformers, inverters

and other power sources in order to avoid

interference with measurement.

(3) Required Lengths of Straight Runs

To maintain accurate measurement, see JIS B7554

“Electro Magnetic Flowmeters” which explains the

requirements for upstream piping conditions of

agneticowmeters.

The piping conditions we recommend as shown in

Figure 3.1.1 are based on JIS B7554 and on our

piping condition test data.

Wheninstallingtwoormoremagneticowmeters

on a single pipe, provide a run of at least 5D

between them.

Gate valve

fully open

Reducer

pipe

5 D or more

2 D or more

10 D or more

5 D or more

0 is allowable

F0301.ai

Tee

90-degree bent

Various valves

Expander

pipe

D: Flowtube Size

Figure 3.1.1 Required Lengths of Straight Runs

*1: Do not install anything in the vicinity that may

interferewiththemagneticeld,inducedsignal

voltages,orowvelocitydistributionsofthe

owmeter.

*2: A straight run may not be required on the

downstreamsideoftheowmeter.However,

ifadownstreamvalveorotherttingcauses

irregularityordeviationinows,providea

straight run of 2D to 3D on the downstream

side.

*3: Highly recommend to mount valves on the

downstreamsidesothatdeviatedowsdonot

occurintheowtubeandtoavoidstartupfrom

an empty condition.

(4) Maintaining Stable Fluid Conductivity

IMPORTANT

Donotinstalltheowmeterwhereuid

conductivity tends to become uneven. If

chemicals are fed near the upstream side of a

magneticowmeter,theymayaffecttheow

rate’s indications. To avoid this situation, it is

recommended that the chemical feed ports be

locatedonthedownstreamsideoftheowmeter.

If it is unavoidable that chemicals must be fed on

theupstreamside,provideasufcientlengthof

straight run (approximately 50D) to ensure the

propermixtureofuids.

F0302.EPS

(Incorrect)

Upstream side

(Correct)

Downstream side

Figure 3.1.2 Chemical Injection

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 193 194

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