Supply of all-metal all-metal needle pin detection Principle: generally all-metal needle is www.sh-shenyi.cn/products-detail.asp?cpid=20 consists of two parts, namely the detection coil and automatically remove the device, which detection coil core part. After power coil produces a magnetic field, a metal into the magnetic field, the magnetic field is caused by the change, which determine the metal impurities. Some of the product itself moisture, salt until the point components will interfere with the magnetic field similar metal. This phenomenon, called product effect. We can solve this problem by product effect compensation. After detecting the metal, sensor start signal, the drive automatically remove devices, such as flap, Putters, impurities removed. Recommended: Aquatic metal detector metal detector reject www.sh-shenyi.cn/products-detail.asp?cpid=36 www.sh-shenyi.cn/products-detail.asp?cpid=32