Minimum Distance; Inlet And Outlet Sections - ABB ProcessMaster FEP611 Operating Instructions Manual

5.1.8

Minimum distance

ProcessMaster FEPxxx
Distance D: ≥ 1.0 m (3.3 ft ) for design level "A", ≥ 0.7 m (2.3 ft) for
design level "B"
HygienicMaster FEHxxx
Distance D: ≥ 1.0 m (≥ 3.3 ft )
Fig. 14: Minimum distance
— In order to prevent the devices from interfering with each
other, a minimum distance as shown in Fig. 14 must be
maintained between the devices.
— The flowmeter sensor may 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) should be maintained.
— For installation on or to steel parts (e.g. steel brackets), a
minimum spacing of approx. 100 mm (3.94 inch) should
be maintained (based on IEC801-2 and IECTC77B.
D
D
5.1.9

Inlet and outlet sections

A
1
2
B
3 x DN
G12013
Fig. 15: In- and outlet section, turn-off component
1 Double elbow 2 Turn-off component
The metering principle is independent of the flow profile as
long as standing eddies do not extend into the metering
section, such as may occur after double elbows, in the event
of tangential inflow, or where half-open gate valves are located
upstream of the flowmeter sensor.
G12063
In such cases, measures must be put in place to normalize the
flow profile.
A Do not install fittings, manifolds, valves, etc., directly in
front of the flowmeter sensor.
B Inlet and outlet section: Length of straight inlet and outlet
section of the flowmeter sensor.
Experience has shown that, in most installations, inlet
sections 3 x DN long and outlet sections 2 x DN long are
sufficient (DN = nominal diameter of the flowmeter sensor).
For test stands, the reference conditions of 10 x DN inlet
section and 5 x DN outlet section must be provided, in
accordance with EN 29104 / ISO 9104.
Valves or other turn-off components should be installed in
the outlet section.
Butterfly valves must be installed so that the valve plate
does not extend into the flowmeter sensor.
ProcessMaster FEP610, HygienicMaster FEH610 | OI/FEP610/FEH610-EN Rev. B 15
2 x DN
2
G12008