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[China]
Trade Verify
Address: 2/F, Bldg. 1, Row 1, Shijing Ind. Zone, Sangyuan, Dongcheng St., Dongguan, Guangdong, China (Mainland)
Contact name:Leon Lin
GUANGDONG SHANAN TECHNOLOGY CO.,LTD |
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Verified Suppliers
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Rectangular Aperture small tunnel size high precision food grade
metal detector / food metal detection
Sensitivity reference
| Details Tunnel size | 40*12cm | 40*15cm | 40*20cm | 50*15cm | 50*20cm | 50*25cm | 50*30cm |
| Sensitivity Fe(mm) | 0.8 | 1.0 | 1.2 | 1.0 | 1.2 | 1.5 | 2.0 |
| Sensitivity SUS(mm) | 1.5 | 2.0 | 2.5 | 2.0 | 2.5 | 3.0 | 3.5 |
| Detection height | 120 | 150 | 200 | 150 | 200 | 250 | 300 |
| Detection width | 400 | 500 | |||||
| Belt speed | 10-35 meters per minute adjustable | ||||||
| Alarm method | Light and sound and optional reject | ||||||
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
