Noise and offset voltage-compensated electromagnetic flowmeter
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United States of America Patent
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Sep 4, 1990
Grant Date -
N/A
app pub date -
Aug 31, 1989
filing date -
May 4, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electromagnetic flowmeter whose primary includes a flow tube through which the fluid to be metered is conducted to intersect a magnetic field and thereby induce a voltage therein that is transferred to electrodes to produce an electrode signal as a function of flow rate, which signal includes a noise voltage. The electrode signal is applied to the input amplifier of a secondary whose output is fed to one input of a summing stage, the output of which is fed to a range amplifier that yields a test voltage, the input and range amplifiers producing offset voltages. To compensate for the noise and offset voltages, a compensation voltage is derived from the test voltage and applied to the other input of the summing stage. This compensation voltage is produced only when the test voltage exceeds a predetermined threshold value.
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