Conveyor Metal Detector Systems | Tunnel Metal Detector Conveyors

How does a conveyorized metal detection system work?

A conveyor is integrated with a tunnel metal detector to allow the product to pass through the aperture of the metal detector and be inspected for metal contaminants.

METTLER TOLEDO Safeline provides a range of industrial tunnel metal detectors to suit your inspection and budget needs. They are capable of detecting all types of metal, including ferrous, non-ferrous and even difficult to detect grades of stainless steel.

With our modular Global Conveyor (GC) Series, food processors can choose from a range of reject devices, conveyor belt types, system integration widths and lengths and failsafe monitoring features to provide a flexible solution to meet production needs.

The metal detector, transport system, reject device and a suite of integrated sensors work in harmony so metal-contaminated products can be efficiently detected, rejected and removed from the production process.

What equipment comes with an industrial conveyorized metal detection system?

In addition to the different reject mechanisms available, other important equipment may include:

  • Lockable container to collect and hold rejected product
  • Full-length cover between detector and reject mechanism
  • Failsafe alarm to alert metal detector faults.  

There are a number of additional optional failsafe systems to raise the level of due diligence for manufacturers.

Our metal detection systems for conveyorized applications can be tailored to suit specific inspection requirements, including a choice of aperture sizes, reject mechanisms, failsafe system components, conveyor belt materials, connectivity options and more.

Which environments are conveyorized metal detection systems suitable for?

Our conveyorized metal detection systems are suitable for almost any environment: dry and packaged products, and even wet, chilled and frozen products in extreme environments.

When the working environment gets tough, inspection systems need to be specified to equally high standards. METTLER TOLEDO Safeline's conveyorized metal detection systems can be configured with heavy-duty stainless steel detectors rated at IP69K, integrated with rugged, heavy-duty conveyor frames sealed up to IP69K standard.

Why buy an integrated metal detection solution from a single supplier?

Careful consideration needs to be taken into account when designing a conveyorized metal detection system, particularly around static build up on the conveyor frame. This can interfere with the metal detector and create false rejects. A solid system design eliminates static build up, allowing the detector to run at optimum sensitivity, without false rejects.

Purchasing an integrated metal detection solution from METTLER TOLEDO can help you to maximize your equipment performance by having a seamlessly integrated metal detection solution across your production line, without compromising on reliability.

With flexible modular solutions such as our GC Series metal detection systems, food processors and manufacturers can meet compliance needs now and into the future by adapting the metal detection system to suit changing production line requirements.

What is a tunnel metal detector?

A tunnel metal detector inspects raw or processed foods or non-food products for metal contamination. Food processing companies use tunnel metal detectors to comply with food safety standards and retailer codes of practice. When integrated with a conveyor system, all types of metal contaminants can be detected and rejected, preventing metal contaminated products from reaching the end consumer.

Where can I use a tunnel metal detector?

A tunnel metal detector is a versatile industrial metal detection solution that can be used in a wide variety of product inspection applications. Tunnel metal detectors can be integrated with conveyor systems, to inspect raw, processed, or packaged food or non-food products for all types of metal contaminants. A HACCP analysis will establish the most relevant critical control points, indicating the best installation location for the metal detector.

How can we integrate a tunnel metal detector within a food production line?

The easiest way to do this is to buy an integrated metal detection system consisting of a tunnel metal detector and a conveyor system, from a single supplier. METTLER TOLEDO Safeline manufactures a wide range of tunnel metal detectors and conveyor systems designed for food and non-food processing applications. Our metal detection systems for conveyorized applications can be tailored to suit specific inspection requirements, including a choice of aperture sizes, reject mechanisms, failsafe system components, conveyor belt materials, connectivity options and more.

How does a tunnel metal detector work?

The majority of tunnel metal detectors are balanced coil systems. Three coils are wound onto a non-metallic frame and each coil is exactly parallel with the other two. We explain exactly how tunnel metal detectors operate in our Metal Detection Guide. You can read more about this from page 8 of the guide.

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How sensitive is a tunnel metal detector?

The sensitivity of a tunnel metal detector can vary depending on the application, the metal detector manufacturer and the metal detector itself. Sensitivity performance is determined by the diameter of a sphere made from a specific type of metal. The sphere must be reliably detectable when placed in the center of the aperture of a tunnel metal detector. A tunnel metal detector loses sensitivity the larger the aperture size.

Dry products such as confectionery and cereals, are relatively easy to inspect. Detectors operating at high and ultra-high tuned frequencies (typically in the region of 800kHz and above) deliver high levels of overall sensitivity and are especially good at detecting stainless steel type contaminants.

When inspecting wet or conductive products such as fresh meat, poultry, cheese, fish and metallized film packed products, the situation is different. The wet product itself creates a 'product effect signal' in the detector – and this signal needs to be cancelled out before inspection can begin. Innovative multi-simultaneous frequency technology can be used to overcome product effect, detecting significantly smaller metal contaminants.

How do I choose the right tunnel metal detector?

METTLER TOLEDO Safeline offers a wide variety of industrial tunnel metal detectors for use in food and non-food processing applications. These can be used at various stages of the production process, including inspecting raw materials, in-process to protect downstream equipment, or after final packaging to provide peace of mind that there is minimal risk of subsequent contamination.

Profile Advantage technology is ideal for challenging applications that are subject to product effect where food is hot, wet, chilled, frozen, or packed in metallized film, using multi-simultaneous frequency and product signal suppression technology. Whereas Profile technology is optimized for dry product inspection.

We also offer a number of other tunnel metal detection solutions for bulk and compact product inspection, as well as combi systems, which are integrated with a dynamic checkweigher to provide multiple product inspection capabilities within a single unit, offering a compact footprint.

Safeline Metal Detector

Metal Detection - Safeline

Detecting and rejecting metal contamination in food and pharmaceutical applications

Overcoming Product Effect

Overcoming Product Effect With Profile Advantage Technology

How to detect smaller metal contaminants and reduce false rejects

How to Choose the Right Reject System

How to Choose the Right Reject System – Free PDF Download

White Paper to Offer Manufactures Guidance on Available Production Line Reject Solutions

How Much Can You Save by Virtually Eliminating False Rejects?

How Much Can You Save by Virtually Eliminating False Rejects?

Calculate your savings from using Profile Advantage in challenging wet applications

GC Series Metal Detection Systems

GC Series Metal Detection Systems

Adapatable conveyorized systems ensure future-proof compliance