Basically there are several types of metal detectors that operate with different detection methods. In the food industry, metal detectors usually apply the transmitter-receiver method (see graphic). Such metal detectors are equipped with a transmitter coil and two receiver coils.The electronic unit in the metal detector analyses this signal, evaluates it and signals a metal contamination.
Such metal detectors are equipped with a transmitter coil and two receiver coils. The transmitter coil generates a constant electromagnetic field. When a metal particle passes the detector it interferes with the electromagnetic field, causing a signal to be detected by the receiver coils. The electronic unit in the metal detector analyses this signal, evaluates it and signals a metal contamination. As a rule metal detectors in the food industry are equipped with automatic reject units that directly separate the contaminated product from the production line.
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