Metal detectors can be widely used for detecting and removing iron and non-ferrous metal impurities in aquatic products, meat, fungi, candies, grains, fruits and vegetables, dairy products, health products, additives, seasonings, pharmaceuticals, health products, biological products, cosmetics, gifts, packaging, paper products, chemical raw materials, rubber, plastics, textiles, leather, synthetic fibers, and toys.
Metal detectors use the principle of electromagnetic induction to generate a rapidly changing magnetic field through a coil with alternating current passing through it. This magnetic field can induce eddy currents inside metal objects. Eddy currents can generate a magnetic field, which in turn affects the original magnetic field and causes the detector to emit a sound. The performance and reliability of metal detectors depend on the stability of the electromagnetic transmitter frequency, typically using operating frequencies from 80 to 800 kHz. The lower the working frequency, the better the detection performance for iron; The higher the working frequency, the better the detection performance for high carbon steel. The sensitivity of the detector decreases as the detection range increases, and the magnitude of the induced signal depends on the size and conductivity of the metal particles.