As is inspected by applying electromagnetic induction, it is a device that automatically sorts out defective products containing foreign metallic substances such as iron (Fe), stainless steel (Sus), and non-ferrous metals that are abnormally mixed in the product.

1. In the food and pharmaceutical manufacturing sector, it is a device that detects deadly metallic foreign substances in the human body.

2. In the industry, Protection of expensive industrial equipment.

3. In the CCP of HACCP, Basic equipment for setting and managing

1. Usually inside the tunnel type metal detector, a coil is wrapped around the tunnel in a circular or square shape as shown in the figure on the right.

2. If a current with frequency is passed through the transmission coil, it is not visible, but An electromagnetic induction phenomenon occurs and a magnetic field is formed inside the metal detector tunnel.

3. At this time, if a certain electric signal is sent to the transmitting coil, an electric signal of a certain intensity is formed in the receiving coil. It is called a state.

4. Here, it judges that the strength of the electric signal in the receiving coil is different and determines the metallic foreign matter.