General Data; Measuring Accuracy; Installation Conditions - ABB FSM4000 Manual

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
Ambient temperature
Power supply

Installation conditions

Warm-up phase
Maximum measuring error
Pulse output
• DN 3 to DN 1000 (¹⁄₁₀ to 40"):
Q > 0.05 Q DN ±0.5 % of measured value
max
• Q < 0.05 Q DN ± 0.00025 Q
max
Q DN = maximum flow rate of the nominal diameter at 10 m/s
max
Analog output effects
Same as pulse output plus ±0.1 % of measured value ±0.01
mA
Y Measured error ± of measured value
X Flow velocity v
Figure 1: Analog output effects
20 °C (68 °F) ±2 K
20 °C (68 °F) ±2 K
Nominal voltage as per name plate
U N ± 1 %
• Inlet section.
> 10 × DN straight section
• Outlet section:
> 5 × DN straight section
DN = Sensor nominal diameter
30 min
DN
max
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
1 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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