| 摘要 |
A magnetoinductive flowmeter incorporates a magnet for generating a magnetic field that permeates the flowmeter's measuring tube with a magnetic field component perpendicular to the direction of flow, a first electrode and a second electrode which collect a voltage induced in the medium, and an amplifier to which the voltage collected by the electrodes is fed. A test voltage source and a comparator are provided, the test voltage source generating a test voltage, which is applied to the amplifier in a manner whereby the test voltage is superimposed over the voltage collected by the electrodes. The comparator is connected to the amplifier so that the output voltage of the amplifier can be fed to the comparator, and the comparator is designed in a manner whereby the output voltage of the amplifier can be compared with a reference value. This configuration permits easy calibration of the magnetoinductive flowmeter while during operation, any deviation from a calibrated condition can be detected reliably. A method for operating the flowmeter is also disclosed.
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