Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1996-10-07
1997-10-14
Biegel, Ronald L.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386116, 73601, G01F 100
Patent
active
056774966
ABSTRACT:
An electromagnetic flow meter which calculates the electric conductivity of a fluid based on the ratio of an output signal generated when electrodes are grounded through short-circuit resistors Rs.sub.1, Rs.sub.2 to an output signal generated when the electrodes are not grounded, and more accurately corrects a flow measurement using the electric conductivity, characterized in that, for reducing measurement errors due to fluctuation in DC offset voltage accompanied by an on/off operation of the short-circuit switch S1, outputs are measured when the short-circuit switch S1 is on and off in a magnetization state, the output are next measured when the short-circuit switch S1 is on and off in a non-magnetization stage, and the outputs in the non-magnetization state are subtracted from the outputs in the magnetization state, thereby removing the influence of "DC offset voltage fluctuation" occurring accompanied by the on/off operation of the short-circuit switch S1.
REFERENCES:
patent: 4206641 (1980-06-01), Takada
patent: 4210022 (1980-07-01), Boss
patent: 4856345 (1989-08-01), Mochizuoki
patent: 4969363 (1990-11-01), Mochizucki
patent: 5524493 (1996-06-01), Yoshida
Aichi Tokei Denki Co., Ltd.
Biegel Ronald L.
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