Electrical flowmeter with two output switches - whose outputs are integrated in turn, compensating for source voltage fluctuations

摘要

An electromagnetic flowmeter includes a first switch rendered conducting for a prescribed period simultaneously with an A.C. voltage obtained in proportion to the period of the A.C. magnetic filed; a second switch actuated after the conduction of the first switch; a circuit for integrating outputs corresponding to the flow rate of a fluid obtained through the first switch and further integrating these outputs with an opposite polarity; a circuit for rendering the second switch non-conducting when an output from the integration circuit reaches a referential level; and a circuit for generating an output corresponding to the period in which the outputs are integrated, for each operating cycle of the integration circuit.