FSM4000 ELECTROMAGNETIC FLOWMETER | OI/FSM4000-EN REV. E 17
Inlet and outlet sections
Double manifold
Turn-off device
Figure 15: 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.
Free inlet or outlet
Figure 16: Free inflow and outflow
A For a free outflow, do not install flowmeter at the highest
point of the piping or on its outflow side, since the
measuring tube may run empty, creating air bubbles.
B For free inflow/outflow, provide an invert to make sure that
the piping is always full
Mounting with heavily contaminated measuring media
Figure 17: Bypass line
For strongly contaminated measuring media, a bypass line in
accordance with the figure is recommended so that operation of
the system can continue to run without interruption during
mechanical cleaning.
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