Temperature-compensated electromagnetic flowmeter

Details Temperature-compensated electromagnetic flowmeter Temperature-compensated electromagnetic flowmeter

1978-11-02

1980-12-02

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

System

361140, G01F 160

Patent

active

042364108

ABSTRACT:
An electromagnetic flowmeter in which the fluid to be metered is conducted through a flow tube provided with a pair of diametrically-opposed electrodes. The fluid intercepts a magnetic field established in the flow tube by a magnetizable core having a coil wound thereon through which an excitation current flows, thereby inducing a signal voltage in the electrodes. Because the permeability of the core is temperature-dependent, changes in temperature affect the strength of the magnetic field and adversely influence the signal voltage. Compensation means are provided to render the signal voltage independent of temperature, thereby producing an output signal accurately proportional to flow rate.

REFERENCES:
patent: 2898524 (1959-08-01), Stamberger
patent: 3380301 (1968-04-01), Mannherz et al.
patent: 3573525 (1971-04-01), Fuse
patent: 4033830 (1977-07-01), Fletcher

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