30
Product Compensation
Metal detectors are capable of detecting metal by measuring two characteristics:
Conductivity: ( Wet )
Any conductive material will generate a specific error signal. However, many food products by nature are electrically
conductive themselves. Salt and moisture content combine to produce conductive product effect which must be
overcome in order to detect small metal contaminants.
Magnetic: Permeability: ( Dry )
Any material passing through the detector which has magnetic qualities will generate a signal which must be overcome
in order to detect small contaminants. Products which contain iron fortification can produce magnetic error signal.
The DSP metal detector overcomes these product effects by automatically adjusting itself to compensate for the specific ‘phase’
of the error signals.
Figure 30
Typical ‘Wet’ products:
• Bread, buns, cakes
• Meat, poultry (fresh)
• Dairy products
• Fresh produce
Typical ‘Dry’ products:
• Cookies, candy, chocolate
• Dry powders
• Oil based products (peanut butter)
• Cereals
Reactive
( Magnetic )
Resistive
( Conductive )
Iron (ferrous)
Conductive Product
Stainless Steel
Copper (Non-ferrous)
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