Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1989-08-31
1990-09-04
Woodiel, Donald O.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
G01F 160
Patent
active
049534092
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.
REFERENCES:
patent: 4704908 (1987-11-01), Blatter
Marchewka Werner
Rackebrandt Karl-Heinz
Schafer Klaus
Seebode Albert
Ebert Michael
Fischer & Porter Company
Woodiel Donald O.
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