• v = Velocity of conductor (media)
• k = k
1
x k
2
U
i
= k x v, the electrode signal is directly proportional to the uid velocity
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 amplies the ow-proportional induced voltage signal from the electrodes.
The input impedance is extremely high: >10
14
Ω which allows ow measurements on
uids with conductivities as low as 5 µS/cm. Measuring errors due to cable capacitance are
eliminated due to active cable screening.
Description
3.3Theory of operation
SITRANS FMS500
Operating Instructions, 01/2024, A5E52677520-AA 15
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