Digital flow meter

Electromagnetic flow meter is based on the Faraday's Law of Electromagnetic Induction. The conductive liquid cut the magnetic line and cause induced electromotive force when do the direction perpendicular to the magnetic field lines in the alternating magnetic field along the measuring pipe. So we install a pair of electrodes on the pipe wall which orthogonal with sounding pipe axis and magnetic line. The electrodes can detect the induced electromotive force. It should be directly proportional with the flow. Then the liquid's flow will be exported by the detection. As shown in the graph below, the induces electromotive force signal will be converted to standard DC current signal (0-10) mA,(4-20)mA or (0-5)KHz Frequency output which is directly proportional with flow signal by amplification of converter. So the results of flow measurements come out.