Method and apparatus for compensating for a DC offset voltage in an electromagnetic flow meter

摘要: In magnetic induction flow measurement in which a rate of fluid is measured by means DC field (H) having periodically reversed polarity, method and apparatus compensate for offset voltage generated an amplifying circuit electromagnetic flowmeter signal produced across electrodes (3, 4) sampled stored each pair sampling periods (T₂, T₅) when the takes positive polarity negative respectively, difference between values formed as output voltage. The compensa­tion period following to produce compensation be superimposed onto voltage, compensated superimposing held until succeeding period. comprises differential amplifier (7) are connected through capacit­ors (C4, C5) respectively; adder (8) two inputs one differen­tial (7); (9) input (8); integration circuit; switch (S1) inserted (15) period, generating being other (8).