Eddy current sorters are widely used in industries or workshops that separate mixed metals in the form of rod, tube, wire, electrode, bolt, nut, gear, pinion, mechanical parts, sintered products and forging parts. When the chemical composition, heat treatment, metallurgical structure or case hardening are different, it can classify metal parts of the same size. It is very useful for automotive industry, electrode manufacturing industry, heat treatment workshops, bar plants, fastener industry and pipe manufacturing industry and final inspection in the quality control department. When a metal object is placed in a coil excited by an alternating current, eddy current will be generated in it due to electromagnetic induction. The size and phase of the eddy current depend on the field current in the coil, the electrical characteristics of the test object and the total electromagnetic field in it. Electrical characteristics and electromagnetic fields are again dependent on the metallurgical and physical conditions of the object. Therefore, if two metallic objects of the same size are different in metallurgical conditions, the size and phase of the eddy currents generated in them will also be different. If the difference can be accurately compared in some way, the objects can be classified.
Eddy current sorter can be very convenient when used in workshops at different stages of production, and the inspection department can carry out the final inspection before its entering the laboratory and standard room, so as to guarantee work quality. Although both ferrous metals and nonferrous metals can be classified by instruments, it has unique application in nonferrous metals when rapid classification by nondestructive means is needed. It can easily classify lead and lead-free brass, white copper of different components, lead tin alloy, silver and silver alloy, copper and copper alloy, aluminum alloy. In addition, it can identify precious metals and work as the quality standard in commerce.