Mounting Position - ABB FSM4000 Manual

6 FSM4000 ELECTROMAGNETIC FLOWMETER | DS/FSM4000-EN REV. L
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... General data
Inlet and outlet sections
1 Double manifold
Figure 4: Inlet and outlet section, turn-off devices
The measuring principle is independent of the flow profile as
long as standing eddies do not extend into the measured
value formation, such as may for example occur after double
manifolds, in the event of tangential inflow, or where half-
open gate valves are located upstream of the sensor. In such
cases, measures must be put in place to normalize the flow
profile.
A Do not install fittings, manifolds, valves, etc., right before
the flowmeter sensor.
B Inlet / outlet sections: length of the straight piping
upstream and downstream on the sensor.
Experience has shown that, in most installations, straight
inlet sections 3 × DN long and straight outlet sections
2 × DN long are sufficient (DN = nominal diameter of the
flowmeter sensor).
For test stands, the reference conditions of 10 × DN
straight inlet and 5 × DN straight outlet must be provided,
in accordance with EN 29104 / ISO 9104.
Valves or other turn-off devices should be installed in the
outlet section.
Valve flaps must be installed so that the valve damper
plate does not extend into the flowmeter sensor.
2 Turn-off device

Mounting position

Figure 5: Mounting position
A Vertical installation for measuring abrasive materials,
preferably with flow in upward direction.
B For a horizontal installation, the meter tube must always
be completely filled with the measuring medium.
Provide for a slight incline of the connection for
degassing.