Circuit arrangement for operating a plurality of magnetic flow s

Details Circuit arrangement for operating a plurality of magnetic flow s Circuit arrangement for operating a plurality of magnetic flow s

1992-12-15

1995-04-04

Chilcot, Jr., Richard E.

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

73861, G01F 100

Patent

active

054026857

ABSTRACT:
A circuit arrangement is provided for connect each of a plurality of magnetic flow sensors to a single electronic evaluating unit. Each of the flow sensors includes a measuring tube through which a fluid flows, a coil arrangement, and two measuring electrodes. An electronic evaluating unit includes a processing unit for the potentials of the measuring electrodes, a subsequent digital calibrating and zero-balancing arrangement for generating calibration and zero-offset data, a memory for said data, and a generator circuit for generating the coil current. Through-switching is effected by means of a switching arrangement which includes an optotriac for each flow sensor and an analog multiplexer with double or triple switching paths. The multiplexer switches through the signals from the measuring electrodes. In three further variants, a processing unit is provided in the flow sensor, and a further-processing unit in the electronic evaluating unit. In one of these variants, each of the flow sensors includes a digital calibrating and zero-balancing arrangement and a memory for the data therefrom, whose contents are switched through via a digital multiplexer. In another variant, each of the flow sensors include an analog calibrating and zero-balancing arrangement.

REFERENCES:
patent: 3717031 (1973-02-01), Biscar
patent: 3949207 (1976-04-01), Savory et al.
patent: 4408497 (1983-10-01), Suzuki
patent: 4586144 (1986-04-01), Fukomoto
patent: 4593365 (1986-06-01), Haley, Jr. et al.
patent: 5058032 (1991-10-01), Farrell et al.

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