Metal Detection


 
 

**Customer Feedback** Received 18/11/2011

From:  
Sent: 18 November 2011 15:40
To: Adie Morris
Subject:
RE: Detectamet Samples

Morning Adie,

Following up from our meeting yesterday.

After receiving sample pens from yourselves I had some of our staff put the pens through their paces, The Super XP Cryo pen was issued to one of our very cold Deli department. Mark certainly went that extra mile to test your pen, He did the following things over a six day period:

· Dropped the pen on several occasions

· Dropped the pen into oil (either Rapeseed or Olive)

· Dropped the pen in to water

· Allowed it to write on paper with powder residue on it such as flour and spices

All of this happened in an area which is constantly below 4°C, I taken the Cryo XP pen off Mark and passed it on to one of our vessel minders to trial it in a warm-hot working area (Cooking), Just to make it clear Mark was not at all happy about me taking the pen due to how good he found it.

I will update you next week to conclude our trials.

 

**Customer Feedback** Received 03/10/2011

From:  
Sent: 01 October 2011 03:40
To: Sean R. Smith
Subject:
X-ray & Metal detection tests

Hi Sean

Just a quick update I did some more testing this week on the x-rayable & metal detectable products. I managed to test the x-rayable bandaid in the glass line x-ray & found that it rejected it 100% of the time. The three metallic strips within the bandaid were very clear on the machine, although the remainder of the bandaid was invisible on the image. This is obviously because the plastic is so thin & light weight. The x-ray was playing up, so I couldn't spend any more time on it (hopefully more testing next week).

I then took the various samples -pen, bandaid, bag tag, cable tie, hairnet & glove to one of our metal detectors & ran them all through the machine. (Safeline Profile metal detector).

The results were stunning. All samples were 100% detected & rejected- even the tiny little bandaid. The indicator on the screen of the detector went from green to full red bars (off the scale) showing me that it was very easily seen by the machine.

I'll keep in touch with further developments

 


Material Specification

Please email sales@us.detectamet.com for all technical data sheets required.

 

What is the answer to the question:

 

 "How detectable are Detectamet products?"

 

Detectamet products are made from various non metallic materials (materials that offer the best capabilities for food applications that cannot always use a metal alternative), most Detectamet products are made with a proportion of a metallic magnetic trace element which is present through out the whole object, this is at a size and concentration that allows a homogeneous flow throughout, ensuring that all parts are potentially detectable.

 

Other products have a metallic strip etc bound to the product. These products are not detectable throughout.

 

Detectamet products are all detectable - but there will be a cut off point. This will not be systematic for all customers and indeed for all machines/lines or sites.

 

There is no 100% guarantee of zero risk with any detectable products.

Even metal - have you ever considered why small pieces of metal are able to get into production lines?

 

There  will always be a limit as to at what point the Detectamet material (or any detectable material) will stop being detected!

This point will generally be when the metal content in the object is smaller than the settings you are using. At this point any metal foreign object will pass through your system. Metal detection systems are a safeguard to a point.

 

Metal detection is not a precise science. Machines may be very accurate, high tech and high specification instruments but there are many variable's to consider:

Type of food or product

Packaging

Speed and orientation of the metal

Detector settings

Sensitivity and age, to name the most common ones!

 

Contrary to the rule - many  Detectamet products will be detected in general better within a wet environment rather than dry - but will achieve good results to implement into HACCP for all areas.

 

Ask yourself these questions:

 

What do you have the metal detector set at? Which areas have you tested in WET or DRY?

Ferrous ?

Non Ferrous ?

Stainless Steel ?

What was the smallest piece detected?

 

Lost or found?

Ask yourself this important question : By what percentage am I now safeguarding my customers? - If you have a non metal detectable pen you have 100% chance of facing an issue caused by the potential of a lost pen. If you have a Detectamet pen which can detect to a piece as small as 5mm then you have a 95% chance that lost pen will be found.

 

Remember that Detectamet products show that you are using all due diligence, and you have taken the best precautions available.

 

We strongly advise that you always carry out in house tests on all the Detectamet products. For more help and information please contact our Technical Sales at sales@us.detectamet.com for more information/test results achieved by Detectamet, Data Sheets etc.

 

Material Specification :

Please email sales@us.detectamet.com for all technical data sheets required.

Many people think of magnetism as a property of metal, particularly iron, since common household magnets are made from iron. Electrical currents are actually the force behind magnetic fields, which form as electrical charges move around. On a large scale like an electromagnet, the magnetic field is created by passing current through wires. In the case of a household magnet, the field is created by the movements of electrons in their electronic orbits.

An electromagnet works on the principle that an electric current not only allows electrons to flow in a circuit, but also generates a small magnetic field. When a wire carrying electricity is coiled, the magnetic field becomes even stronger. Iron or steel objects surrounded by this coiled electric wire also become magnetized. This combination of electronic energy, coiled wiring and conductive metal object forms the basis of an electromagnet.

 

The most commonly used metal detector in food production is the Balanced 3 Coil Detector. The electric current is passed through the wire coil (transmitter coil) surrounding an aperture through which the food passes.

 

The magnetic field so produced induces a current in the wire coils (the receivers)

placed either side of the transmitter. The presence of a piece of metal or Detectamet product for example changes the current induced in the reciever coils enabling detection.

 

This type of metal detector can detect a range of different types of metal or objects containing metals such as the Detectamet range of products. However the machine must be tuned to the particular metal type and size which is regarded as the greatest risk - hence the need to identify the most important risks before deciding on the necessary controls. It must be noted that the sensitivity of this type is also affected by the type of product, moisture content, the metal being detected, the size, shape and orientation of the metal fragment, or Detectamet product, even the position within the product.

 

Recent advances in this type of machine has been in the development of variable frequency instruments, selecting the optimum detection frequency for the metal to be detected.

 

There are some simple steps you can take to increase the detection of Detectamet products - These adjustments will not change your settings - We only advise these to customers who may be experiencing difficulties in detecting Detectamet products in trials. Please call us for more information.

 

The other type of metal detector used in the food industry is the "Ferrous in Foil" or Magnetic Field system. This system is simple to set up, having just one control to adjust sensativity. The field is provided by permanent magnets and a piece of metal passing through the field induced a current in the wire coils surrounding the food package.

 

This type of machine is incapable of detecting large pieces of non-ferrous or stainless metals.

 

Please advise us if you are using this machiine as it may be able to detect cerrtain Detectamet products.

 

The science behind Metal Detection was first discovered over 100 years ago and was published by James Clerk Maxwell.

 

Maxwell was a theoretical physicist, he explored theories on how the natural world works using mathematical equations. In 1873 he published a set of equations that described how electricity and magnetism are the same thing.

15 years later it was proved in an experiment that his theory was correct.

This was carried out by Heinrich Hertz.

 

Today we still use the term "Hertz" to describe the frequency, or speed, at which an electromagnetic wave is generated.

 

The discovery by Maxwell means that light, radio waves, magnetic waves, microwaves, X rays and many other forms of energy can be created with the use of electricity.

 

It is this scientific understanding of the nature of electricity and magnetism which has allowed us to build all sorts of detectors.

 

Detectamet products are suitable for use with magnets which are found on many production lines. Magnets are used for the removal of ferrous metal contaminants. Ceramic permanent magnets are used to remove objects such as nuts and bolts and powerful earth magnets are used to remove small items such as rust particles. Magnets are arranged in a variety of ways - depending on the food type, moisture content  of a product, whether it is in a pipe or loose on a conveyor.

 

If experiencing any difficulties in detecting Detectamet products by metal detection systems or X-Ray, we always recommend you try a magnet test. This is a sure sign that our product is detectable. We can then begin to look at finding a solution to ensure our product is picked up in your system. It is very often something quite simple!

 

Manual inspection should not be forgotten - All detectable products come in bright blue as standard, but are available in a range of high visibility colours not commonly found in food products or our colour coding can be used to identify areas of high risk or shift patterns.

 

For extra traceability Detectamet can code many items unique to your factory requirements.

 

 

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