Magnetic flowmeter

Details Magnetic flowmeter Magnetic flowmeter

1977-09-21

1978-10-03

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

System

G01F 160

Patent

active

041177215

ABSTRACT:
A magnetic flowmeter whose electromagnet is excited by a low-frequency excitation current having an a-c component and a d-c component, the flowmeter including flow tube electrodes yielding a flow rate signal. A reference-voltage detecting transformer is provided to produce a reference-voltage proportional to the a-c component of the excitation current. Fluctuations in the flow rate signal as a result of fluctuations in the a-c component of the excitation current are eliminated by dividing the flow rate signal by the reference-voltage signal. In order to eliminate from the reference-voltage detecting transformer the unwanted magnetic flux generated by the d-c component of the excitation current, compensating means are provided to generate a counter magnetic flux, whereby saturation of the transformer core and the resultant distortion of the reference voltage signal are avoided.

REFERENCES:
patent: 3339410 (1967-09-01), Steru
patent: 4059014 (1977-11-01), Torimaru

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