FSM4000 ELECTROMAGNETIC FLOWMETER | DS/FSM4000-EN REV. L
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General data
Measuring accuracy
Reference conditions in accordance with EN 29104
Measuring medium
temperature
°C (68 °F) ±2 K
°C (68 °F) ±2 K
Nominal voltage as per name plate
UN ± 1 %
Inlet section.
> 10 × DN straight section
Outlet section:
> 5 × DN straight section
DN = Sensor nominal diameter
Maximum measuring error
Pulse output
• DN 3 to DN 1000 (¹⁄₁₀ to 40″):
Q > 0.05 Q
max
DN ±0.5 % of measured value
• Q < 0.05 Q
max
DN ± 0.00025 Q
max
DN
Q
max
DN = maximum flow rate of the nominal diameter at 10 m/s
Analog output effects
Same as pulse output plus ±0.1 % of measured value ±0.01
mA
Measured error ± of measured value
Flow velocity v
Figure 1: Analog output effects
Grounding
The grounding of the flowmeter sensor is essential for both
safety reasons, and to ensure trouble-free operation of the
electromagnetic flowmeter.
The ground screws on the flowmeter sensor are to be
brought to ground potential. For technical reasons, this
potential should be identical to the potential of the metering
fluid, if possible.
For plastic or insulated lined pipelines, the fluid is grounded
by installing ground plates. When there are stray potentials
present in the pipeline, we recommend installing a ground
plate on both ends of the flowmeter sensor.
To comply with the EMC and Low Voltage Directives, the
connection box/ transmitter must be grounded in addition to
the meter tube of the flowmeter sensor.
Installation conditions
Flow direction
Figure 2: Flow direction
The device measures the flow rate in both flow directions.
Forward flow is the factory setting, as shown in Figure 2.
Electrode axis
Electrode axis
Figure 3: Orientation of the electrode axis
The flowmeter sensor should be mounted in the piping in
such a manner that the electrode axis is oriented as
horizontally as possible.
A maximum deviation of 45° from the horizontal position is
permissible.
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