2
THEORY OF OPERATION
The Flo-Mate measures flow using the Faraday law of electromagnetic induction. This law states that
as a conductor moves through a magnetic field, a voltage is produced. The magnitude of this voltage is
directly proportional to the velocity at which the conductor moves through the magnetic field.
When the flow approaches the sensor from directly in front, then the direction of the flow, the mag-
netic field, and the sensed voltage are mutually perpendicular to each other. Hence, the voltage output
will represent the velocity of the flow at the electrodes.
The sensor is equipped with an electromagnetic coil that produces the magnetic field. A pair of carbon
electrodes measure the voltage produced by the velocity of the conductor, which in this case is the
flowing liquid. The measured voltage is processed by the electronics and output as a linear measure-
ment of velocity.
Figure 2. Theory of Operation
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