18 FEP630, FEH630 ELECTROMAGNETIC FLOWMETER | OI/FEP630/FEH630-EN REV. D
… 5 Installation
… Installation conditions
Grounding
The flowmeter sensor must be connected to ground potential.
For technical reasons, this potential must be identical to the
potential of the measuring medium.
In piping made of plastic or with insulating liner, grounding of
the measuring medium is done by installing grounding plates.
If stray potential is present in the piping, adding a grounding
plate on both ends of the flowmeter sensor is recommended.
Sensor insulation
1 Insulation
Figure 15: Insulation of the flowmeter sensor
In the high temperature design, the flowmeter sensor can be
completely thermally insulated. After the unit is installed, the
piping and sensor must be insulated in accordance with the
figure.
Inlet and outlet sections
1 Double manifold 2 Turn-off device
Figure 16: 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.
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