Electromagnetic flow sensor although history is not long, but very fast development, has been widely used in many industries, such as sewage treatment industry, chemical industry, medicine industry and so on, especially in the sewage treatment industry, product flow sensor is indispensable. As people more and more high to the requirement of standard of living, the environmental problem is becoming more and more attention, for the management of pollution is also increasing, in this process requires using a variety of sensor products, it also indirectly promote the development of the sensor industry. Let’s talk about one of them – electromagnetic flow sensor, see how it works, what are the special advantages.
Electromagnetic flow sensor is designed on the basis of the principle of electromagnetic induction, it converts the flow the quantity to induction electromotive force, and then we know the size of the flow rate through the conversion relations. It contains two electromagnetic coil, used to produce a constant magnetic field, the conductive medium flows through the tube ACTS as the role of the metal rod, cutting lines of magnetic force in the movement process, to produce inductive electromotive force. The size of the induced electromotive force and fluid flow rate, pipe size, magnetic induction intensity. Pipe size and magnetic induction intensity is known, is proportional to the induced electromotive force and velocity. This type of sensor is simple design normally only when measuring the one-way traffic, to install, also notice the direction, the output signal and analog signals. Multi-function products not only can measure the bidirectional flow, also has a top and bottom line switch range, flow display, alarm, fault diagnosis and many kinds of communication mode. This kind of sensor is used to measure the flow of time, need to be aware of a problem is the electrical conductivity of current body size, it can’t be below the threshold of sensor measurement, general-purpose products threshold is generally higher than 5 x 10-6 s/cm, if the current threshold is too small, the measurement error is very big, can’t even measure. Know for the electrical conductivity of current body size, product manuals will be prescribed length of signal lines between the sensor and converter, which has a very big influence on the measured results.
Electromagnetic flow sensor to get such a broad range of applications, is that many of its inherent characteristics. It is not affected by fluid density, viscosity, temperature, pressure and conductivity changes significantly affect; In use process will not blocking situation, can be measured with suspended solids and fluid solid particles; Its simple structure, no moving parts, no wear, long service life; Product type many, explosion-proof/non explosion-proof, four wire/two wire system, ac/dc power supply, such as multiple choice, meet different needs of customers; Small power consumption, low use cost; Measurement of high reliability, good repeatability, can free maintenance for a long time; A variety of output signals for the user to choose from, can have a current signal, the pulse signal and frequency signal, and so on; Especially for corrosive fluids, it is the optimal choice.