Rectangular Aperture small tunnel size high precision food grade metal detector / food metal detection

• Type: Rectangular Aperture
• Sample Types: Packaged Goods
• Construction Material: Stainless Steel
• Description: Our stand-alone-solutions with their own sub frames and independent drive system are ideal and you profit from the universal installation options within your production process and the almost endless range of passage sizes. Different types of conveyors and roller diameters are available.
  Operation of the metal detector is carried out with menu guidance and via the large touch display. Application-specific ejection systems round off our wide variety of stand-alone systems.

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Sensitivity reference

How do metal detection systems work?

According to Quality Assurance & Food Safety Magazine, all general purpose nonferrous metal detectors work in the same way:
Three coils are wound exactly parallel on a non-metallic frame.
The center coil is connected to a high-frequency radio transmitter.
Two transmission-receiving coils sit on either side of the center coil.
Because the two outer coils are identical and the exact same distance from the center, they receive the same signal and produce an identical, balanced output voltage.

When a particle of metal passes through the system:

The high-frequency field is disturbed beneath one coil, changing the voltage and disrupting the balance.
The output fluxes from zero, producing a signal alerting the system to the presence of metal.
Depending on the specifics of the system, a rejection mechanism is generally activated, with the ideal result of removal of 100 percent of the metal and a minimum amount of salable product.

What is product effect and how does it relate to metal detection?

Product effect is an important factor in the selection of a metal detector. If your products are conductive (usually due to water, salt, or iron content), they will affect the electromagnetic field of the metal detector, causing it to produce a false reject. Dry or neutral products generally do not cause this effect.
If product effect is a factor, the correct frequency must be selected to move the product effect signal away from the signal of the contaminants. A metal detector that uses a single frequency cannot accommodate much signal variation thus making it unsuitable for inspecting a variety of product types or those that may vary in temperature. A three frequency, or better still, a multi-spectrum metal detector would be more suitable for these applications.
The most sophisticated metal detectors on the market today use multi-spectrum technology. Instead of relying on just one frequency, a spectrum of multiple frequencies work simultaneously to filter out product signals in a way that is much more effective than a single frequency. In addition, the number of false alarms is greatly reduced