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<3. INSTALLATION>

3-1

IM 01E25D11-01EN

3. INSTALLATION

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.

3.1 Piping Design Precautions

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 (the lining). For

more information, refer to Chapter 6 “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, and other power

sources in order to avoid interference with

measurement.

(3) Required Lengths of Straight Runss

To maintain accurate measurement, see JIS B7554

“Electro Magnetic Flowmeters” which explains the

requirements for upstream piping conditions of

magnetic owmeters.

Based on JIS B7554 “Electro Magnetic Flowmeters”

and our piping condition test data, we recommend

the piping conditions as shown in the following

gures.

When installing two or more magnetic owmeters

on a single pipe, provide a run of at least 10D

between them.

F0301.ai

D: Flowtube Size

Gate valve

fully open

5D or more

or more

Reducer

pipe

Expander

pipe

0 is allowable. 0 is allowable.

10D or more

Tee

90-degree bent

Various valves

0 is allowable.5D or more 0 is allowable.5D or more

or more

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: The valves shall be mounted 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.ai

(Incorrect)

Upstream side

(Correct)

Downstream side

Figure 3.1.2 Chemical Injection

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 51 52

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