Listing ID #3009768
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Contact SupplierThe coil balanced, full loop design does not work well when a product is packaged in foil (pure aluminum). Foil lids and trays are common examples where an alternative system is required. In these situations, the detector uses a series of magnets and is referred to as a “Ferrous in Foil” detector. Non-ferrous and stainless steel contaminants cannot be detected with this type of detector.
They work by incorporating a tunnel or passage which is subjected to a strong magnetic field and, as a result, any magnetic material (such as a metal fragment with a ferrous content) is magnetized as it passes through. Incorporated in the tunnel are a series of coils. When the magnetized particle passes under them, a current is generated which is then amplified by the electronics of the detection system, and this is used to trigger the detection signal output. The signal so produced is processed into operating audio visual alarm and reject mechanism.