Magnetic-inductive flowmeter

Measuring methods which deduce the flow directly from flow characteristics are very common. There are versatile methods being used, which all depend on the velocity of the flowing medium. The most important are measurements with orifice devices, with suspended bodies, and according to a magnetic-inductive method. Beyond that there are flowmeters which use the pressure drop of a flowing liquid in a capillary, and magnetic-inductive, ultrasonic, and Coriolis flowmeters. 

Faraday s law of induction, E = where E is the induced electric field, V the velocity of motion, and B the intensity of magnetic induction, is the basis for at least two types of electromagnetic flowmeters. In such flowmeters, a uniform magnetic induction is established transverse to the flow in a pipe and the flow of the metered fluid generates a potential difference at suitable detecting electrodes. 

Bulk Velocity. Electromagnetic Flowmeters. An electromagnetic flowmeter is based on the principle of electromagnetic induction as expressed by Faraday s law. An electric current is induced in a conductor when it moves across a magnetic field. The flowmeter consists of a pair of electrodes placed diametrically opposite one another on the same section of pipe (Figure 23). A conductive slurry flowing through the... 

One such electromagnetic flowmeter is based on the fact that a moving, polarized dielectric generates an effective magnetic moment. The applicable relation is analogous to the equation describing Faraday s law of induction. For a linear dielectric, this can be written as... 

---