Noise compensation in electromagnetic flowmeter

Details Noise compensation in electromagnetic flowmeter Noise compensation in electromagnetic flowmeter

1975-10-06

1977-04-26

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

System

G01F 158

Patent

active

040193853

ABSTRACT:
A noise-compensating circuit for an electromagnetic flowmeter in which the fluid to be metered is conducted through a flow tube having a pair of diametrically-opposed electrodes mounted thereon, the fluid intercepting an electro-magnetic field whereby a voltage is induced in the fluid which is transferred to the electrodes to produce a flow signal that is a function of flow rate. Noise resulting from asymmetry in the magnetic field as well as noise arising from the signal leads is eliminated by means including a loop coil symmetrically disposed with respect to the transverse axis passing through the electrodes, the loop coil being so connected that the error current induced therein acts to cancel out the noise components in the flow signal.

REFERENCES:
patent: 3316762 (1967-05-01), Westersten
patent: 3449951 (1969-06-01), Westersten
patent: 3739640 (1973-06-01), Folts

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