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• v = Velocity of conductor (media)
• k = k
U
= k x v, the electrode signal is directly proportional to the fluid velocity
i
Operating principle
The transmitter generates a pulsating magnetizing current that drives the coils in the sensor. The
current is permanently monitored and corrected. Errors or cable faults are registered by the self-
monitoring circuit.
The input circuit amplifies the flow-proportional induced voltage signal from the electrodes.
The input impedance is extremely high: >10
fluids with conductivities as low as 5 µS/cm. Measuring errors due to cable capacitance are
eliminated due to active cable screening.
SITRANS FMS500
Operating Instructions, 01/2024, A5E52677520-AA
x k
1
2
Ω which allows flow measurements on
14
Description
3.3 Theory of operation
15
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