Apparatus for providing an indication of fluid flow through a fl

Details Apparatus for providing an indication of fluid flow through a fl Apparatus for providing an indication of fluid flow through a fl

1982-01-15

1984-07-31

Swisher, S. Clement

Measuring and testing

Volume or rate of flow

Using rotating member with particular electrical output or...

G01F 1115

Patent

active

044622635

ABSTRACT:
A flow metering device includes a very sensitive sensor and detection unit for accurately measuring the flow of fluids such as water through a meter housing. At least two excitation windings are wound around a toroidal core of magnetic material having a non-linear characteristic. The excitation windings are connected in series to an AC source in such a way that the magnetic effects of the windings are additive. A pair of pickup windings are also wound around the core but in series-opposition fashion. The output of the pickup windings is fed to a detector unit including a negative feedback amplifier, rectifier diodes and a summing network. The apparatus is so sensitive that it can accurately detect the movement of an internal magnetic rotor through the rotor housing while rejecting other sources of possible interference.

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