5 Installation
18
5.1.8 Minimum spacing of the devices
Distance (D):
≥
1.0 m (3.3 ft.) for variant 1;
≥
0.7 m (2.3 ft.) for variant 2
Distance (D):
≥
1.0 m (3.3 ft.)
Figure 14: Minimum distance
• In order to prevent the devices from interfering with each
other, a minimum distance as presented in
Figure 14
must be
maintained between the devices.
• The sensor must not be operated in the vicinity of powerful
electromagnetic fields, e.g., motors, pumps, transformers, etc.
A minimum spacing of approx. 1 m (3.28 ft) must be
maintained.
• For installation on or to steel parts (e.g. steel brackets), a
minimum spacing of 100 mm (3.94 in
)
must be maintained.
These values have been calculated on the basis of IEC 801-2
or IEC TC77B
5.1.9 Inlet and outlet sections
1
90° out-of-plane double bend
2
Shut-off device
Figure 15: Upstream and downstream sections, shut-off devices
The metering principle is independent of the flow profile as long
as stationary eddies do not extend into the metering section, such
as may occur downstream of 90° out-of-plane double bends, in
the event of tangential inflow, or where half-open gate valves are
located upstream of the sensor. Such cases require measures to
be put in place to normalize the flow profile.
A
Do not install fittings, elbows, valves, etc. directly upstream of
the sensor.
B
Upstream section / Downstream section: Length of the
straight pipe at the inlet and the outlet of the sensor.
Experience has shown that, in most installations, a straight
upstream section length of three times the nominal diameter
of the flow sensor and a straight downstream section length of
two times the nominal diameter of the flow sensor are
sufficient.
For test stands, the reference conditions of straight upstream
section lengths ten times the nominal diameter of the sensor
and straight downstream section lengths five times the
nominal diameter of the sensor should be provided in
accordance with EN 29104 / ISO 9104.
Valves or other shut-off devices should be installed in the
downstream section.
Butterfly valves must be installed so that the valve plate does
not extend into the flow sensor.
Summary of Contents for 406060
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