Introduction:

In the food production industry, metal is one of the most commonly found contaminant materials in food. Metal can be introduced at all stages of processing of food, as it is most commonly used in the construction of machinery, handling equipment and ancillary utensils. A metal detector for the food industry can help ensure the safety and integrity of a wide range of unpackaged, packaged or bulk goods, by identifying metal contaminants during processing or packaging and helping to ensure that they do not enter food that we eat. As part of a HACCP program, metal detection systems can be utilised to provide compliance with food safety standards, retailers’ code of practice, legislation and industry guidance.

Types of Contaminants:

There are three main groups of metallic contaminants that a food metal detector can sense:

Ferrous

Non Ferrous

Stainless Steel detection depends on the magnetic or conductive properties of the contaminant

The ability for a conventional metal detector used in the food industry to detect metallic contaminants depends upon their conductivity and magnetic permeability:

Ferrous metal contaminants are both magnetic and conductive and are easily detected.

Although they are not magnetic, Non-Ferrous contaminants are good conductors and can be detected relatively easily.

Stainless Steel foreign bodies are the most difficult to pick-up as they are usually non-magnetic and a poor electrical conductor. The ability to detect stainless steel is also hindered when the product is wet or has a high salt content.

If there are other types of contaminants (glass, calcified bone, ceramics, stone) to be detected, then an X-ray inspection system for food will offer enhanced detection capabilities.

Features:

lPhase tracking function, which can maintain the stable high-sensitivity detection ability.

lProduct tracking function, which can do adjustment and compensation according to the changes of the product effect automatically.

lAuto-balanced calibration function, which can ensure the service life of the machine.

lAbove 99 products can be restored in product database.

lIP65 dust and water proof.

lThe performance of the conveyor belt is complied with the food sanitation standard, it can be used for inspection of the unpacked food directly.

lCan stably work for a long time, with a special design that is suitable for a harsh production environment of strong vibration and high interference, the equipment won’t miss alarm even when you tap the probe.

Specifications:

Materials: 304 grade stainless steel made tunnel detector, 201 grade stainless steel rame, PVC/ PU white belt.

Belt length (mm): 1600mm.

Conveyor height above ground to belt: 700mm + 50mm foot adjustable, including wheels moveable.

Alarm system: buzzer / warning lights.

Flow speed: 25 m/ min fixed or 10 to 40 m / min variable.

Flow direction: from left to right or opposite(viewing control panel).

Language for operation system: English and Chinese.

Electronic source: AC110V/220V, 50/60Hz, Power: 90/120/200W.

Reject system:

ØStop on Detect Reject(Less than or equal to 50KG) - The conveyor system stops if metal is detected and an alarm sounds, enabling the operator to remove the contaminated product.

ØPusher Reject(Less than or equal to 10KG) - Pneumatically powered pushers divert contaminated product out of the production flow/ belt, as shown below 1^st picture.

ØFlap reject or Drop down Reject - This reject mechanism are typically used to remove contaminated and/or out of spec dry bulk products. Product passes through a chute which in the open position allows good product to continue through. The end flap or lift flap is triggered to divert contaminated or out of spec product out of the good product flow, as shown below 2^nd and 3^rd picture.

ØAir jet type: NG products are blown sideways off of the line by a powerful air jet. It is ideal for small, lightweight packaged products at high speed as shown below 4^th picture.

Tunnel size & Sensitivity chart:

Notice: the above data is empty-loaded machine sensitivity. The real sensitivity will be lower on condition of different products being tested.