Basic Instrumentation for Measuring or Working principle of Electromagnetic inductive flow meter- Instrumentation Training

Basic Instrumentation for Measuring or Working principle of Electromagnetic inductive flow meter- Instrumentation Training 

Basic Instrumentation for Measuring or Working of Electromagnetic Inductive flowmeter - Instrumentation Training The flowmeter is designed for electrically conductive fluids. Do you know the measuring or working principle of Electromagnetic inductive flow meter? Measurement is based on Faradays law of Induction, according to which a voltage is induced in a electrically conductive body which passes through a magnetic field. Thus the induced voltage is proportional to the mean flow velocity, when field strength and pipe diameter are constant. The following expression is applicable to the voltage. Induced voltage(U)=Constant(K) multiplied by Magnetic field strength(B) multiplied by Mean Velocity(V) multiplied by Pipe Diameter(D).

Inside the magnetic inductive flowmeter, the fluid passes through a magnetic field applied perpendicular to the direction of flow. An electric voltage is induced by the movement of the fluid(which must have a minimum electrical conductivity). This is proportional to the mean flow velocity and thus to the volume of flow. The induced voltage signal is picked up by two electrodes which are in conductive contact with the fluid and transmitted to a signal converter for a standardised output signal. This method of measurement offers the following advantages, First one is No pressure loss through pipe construction or protruding parts. Second one is Only the pipe liner and the electrodes are in contact with the fluid. Third one is Measurement is independent of the flow profile and other proporties of the fluid. And the fourth one is Already the original signal produced is an electrical voltage which is an exact linear function of the mean flow velocity.

Basic Instrumentation for Measuring or Working principle of Electromagnetic inductive flow meter- Instrumentation Training