Principle Of operation

The operation of a magnetic Flow meter or Mag meter is based upon Faraday’s law, which states that the voltage induced across any conductor as it moves at right angles through a magnetic field is proportional to the velocity of that conductor. Here water is the moving conductor. A uniform magnetic field is generated by two coils and forcing a constant current through the coil. The magnetic field is in a transverse direction to the flow of water. Since movement of water (corresponding to a moving conductor) generates an EMF transverse to the magnetic field and direction of flow. This EMF is picked up by three sensors which are then amplified by high sensitivity amplifiers. The amplified signal is then converted using high resolution ADC which is then sampled and digitally filtered using a digital signal processor to convert to flow readings.