Electromagnetic flowmeter system having a feedback loop

Details Electromagnetic flowmeter system having a feedback loop Electromagnetic flowmeter system having a feedback loop

1981-09-01

1983-11-29

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

7386117, G01F 160

Patent

active

044174799

ABSTRACT:
An electromagnetic flowmeter system in which the flow rate signal yielded by the flowmeter primary is applied as an input to a secondary which acts to measure the ratio of the input signal to a reference voltage proportional to the magnetic flux established in the primary, the reference voltage reflecting variations in this flux. Ratio measurement is effected in the secondary by means of a feedback loop in which the reference voltage is pulse-modulated by pulses having a constant width and a frequency which varies in accordance with the flow rate, the pulses having a duty cycle sufficient to cancel the input signal at the input of a summing amplifier. When the variable frequency pulse output from the secondary accurately represents the flow rate, the pulse-modulated reference voltage will then be equal in magnitude and opposite in phase to the input signal.

REFERENCES:
patent: 4089219 (1978-05-01), Suzuki
patent: 4227408 (1980-10-01), Schmoock et al.
patent: 4296636 (1981-10-01), Mannherz
patent: 4309909 (1982-01-01), Grebe, Jr. et al.
patent: 4357835 (1982-11-01), Kayama

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