Patent ID: 7827870

Claim:
A fluidic oscillator liquid flow meter comprising: a body including: an inlet portion to receive a flow of fluid to be measured, an outlet portion, and a main channel defining a flow path, the flow path including feedback structure to induce oscillations in the fluid flow: a detector that detects the oscillations, the detector including: magnetic field generating means for applying a magnetic field across the flow path, and at least one pair of sensing electrodes that detect an e.m.f. generated as a result of the oscillations in the fluid flow in the presence of the applied magnetic field, a driving signal applicator that applies an alternating driving signal as a conditioning signal to the at least one pair of sensing electrodes to prevent polarization of the at least one pair of sensing electrodes in use, and a signal processor that: processes signals received from the at least one pair of sensing electrodes, the signals being representative of the detected e.m.f., and ignores the conditioning signal.