Electromagnetic flow meter

Details Electromagnetic flow meter Electromagnetic flow meter

1978-07-11

1980-06-10

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

System

G01F 160

Patent

active

042066417

ABSTRACT:
An electromagnetic flow meter for measuring the flow rate of a fluid, having a flow rate detector excited by a square wave exciting current, an AC amplifier for amplifying the output of the flow rate detector, a pulse width modulation circuit for converting the output of the AC amplifier into a pulse having a pulse width proportional to the amplitude of the output of the AC amplifier, and a circuit for measuring the pulse width of the output pulse of the pulse width modulation circuit. Since the pulse width of this output pulse is proportional to the flow rate, the flow rate of the fluid is determined by measuring the pulse width.

REFERENCES:
patent: 3329018 (1967-07-01), Hognestad
patent: 3751980 (1973-08-01), Fryer
patent: 3943765 (1976-03-01), Takada et al.
"Automatic Supply Voltage and Frequency Compensator for Magnetic Flow Meter," Research Disclosure, No. 136, pp. 52-53, Aug. 1975.

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