ldg-inter.jpg


According to Faraday's law of electromagnetic induction, install a pair of detecting electrodes on the pipe wall which is vertical with axis of measuring pipe and magnetic force line. When conductive liquid pass along with axis of the measuring pipe, conductive liquid cuts the magnetic force line and produces induced electromotive force. The induced electromotive force is detected by the two electrodes and its value is proportional to flow. The valu is E=KBVD

    In the equation:
  • E - induced electromotive force
  • K - coefficient related to magnetic field distribution and axial length.
  • B - magnetic induction.
  • V - aveerage velocity of the conductive liquid
  • D - interval distance of the two electrodes (inner diameter of measuring pipe).
Sensor uses induced electuromotive force E as signal and sends it to converter. After flow signal is amplified, transform filtered and digitalized, instantaneous flow and cumulative flow are displayed by backlight dot-matrix LCD. Converter has communication interface such as RS-485 which supports HART and MODBUS protocol.