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Abstract

A device to measure the flowrate of a fluid containing electrical charges which flows in a pipe section. The device includes at least one electromagnet connected to a current source which generates a magnetic field through the pipe section and at least two electrodes whose central imaginary connecting line passes through the flow stream in the region of the magnetic field to measure the potential resulting from the charge displacements. The circuitry also includes a timing circuit which periodically changes the strength of the excitation current from the current source to the electromagnet and switches a signal shunt which is connected between the electrodes and at least two signal memories. The timing circuit also controls a current sink which is connected in parallel with the electromagnet. The two signal memories, which store signals from the electrodes, are connected to a correction circuit to which the signals stored in the memories are supplied to produce an output signal corresponding to the flowrate of the fluid in the pipe section which is only minimally dependent of the flow profile or the level of the fluid in the pipe section.

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First Claim