Abstract: A circuit for an electromagnetic flowmeter comprises means to apply across a fluid the flow of which is to be monitored a magnetic field in the form of pulses in forward and reverse directions, the pulses being spaced apart in time, means to sample induced voltages taken from electrodes in contact with the fluid in synchronism with the magnetic pulses, and means to process the sampled voltages to produce a flow-representing output signal, wherein means are provided to vary the spacing of the sampling instants to render their spacing non-uniform.

Abstract: An electromagnetic flow meter of the type in which a magnetic field is applied across a fluid the flow of which is to be monitored, the field being applied in the form of pulses in forward and reverse directions, in which induced voltage pulses are taken from electrodes in contact with the fluid, and in which the induced voltage pulses are processed to provide a flow-representing output in the form of a frequency, the flowmeter comprising means to derive first and second signal levels from the amplitudes of the induced voltage pulses corresponding respectively to the forward and reverse directions of magnetic field, and integrator means arranged to receive the first and second signal levels alternately as an input, and to integrate in one direction in response to the first signal level until the output of the integrator means reaches a first reference level and to integrate in the opposite direction in response to the second signal level until the output of the integrator means reaches a second reference leve