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IM 1E7B0-02E
4-1
4. INSTALLATION
4.
INSTALLATION
WARNING
This instrument must be installed by expert
engineer or skilled personnel. The procedures
described in this chapter are not permitted for
operators.
4.1 Piping Design Pre-
cautions
IMPORTANT
Please design the correct piping referring to the
followings to prevent damage for flowmeter and
to keep correct measuring.
(1) Location
IMPORTANT
Please install the flowmeter to the location where
it is not exposed to direct sunlight and ambient
temperature is –10 to + 60
°
C (14 to 140
°
F).
* The minimum ambient temperature –20
°
C is
avaiable only for these sizes 40 to 100mm with
SUS304 flange.
(2) Noise Rejection
IMPORTANT
The instrument should be installed away from
large electrical motors, transformers and other
power sources in order to avoid interference with
the measurement.
(3) Length of Straight Run
To keep accurate measuring, JIS B7554 “Electro
Magnetic Flowmeters” explains about upstream piping
condition of Magnetic Flowmeters.
We recommend to our customers about the piping
conditions shown in Figure 4.1.1 based on JIS B7554
and our piping condition test data.
Gate valve fully open
Reducer
Expander pipe
5D or more 2D or more
Do not care to 0D
10D or more
2D or more
Tee
90 degrees bent
Various type of valve
5D or more
Do not care
to 0D
10D or more
2D or more
Do not care
to 0D
Figure 4.1.1
Minimum Length of Required Straight Run
NOTE
1. Nothing must be inserted or installed in the
metering pipe than may interfere with the
magnetic field, induced signal voltages, and
flow velocity distribution.
2. These straight runs may not be required on
the downstream side flowmeter. However, if
the downstream valve or other fittings cause
channeling on the upstream side, provide a
straight run of 2 D to 3 D on the downstream
side.
(4) Liquid Conductivity
IMPORTANT
Please avoid to install the flowmeter at location
where liquid conductivity is likely to be non-
uniform. Because it is possible to have bad
influences to the flow indication by non-uniform
conductivity when a chemical liquid is injected
from upstream side close to the flowmeter.
When this occurs, it is recommended that
chemical application ports are installed on the
downstream side of the flowmeter. In case
chemicals must be added upstream side, please
keep the pipe length enough so that liquid is
properly mixed.
Figure 4.1.2
Chemical Injection
Содержание AE100D
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