Electromagnetic flow meter removing influence of fluctuation in direct-current offset voltage
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United States of America Patent
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Oct 14, 1997
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N/A
app pub date -
Oct 7, 1996
filing date -
Feb 26, 1996
priority date (Note) -
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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.
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