Why use a magnetic separator?

Magnetic separators trap and remove metal contaminants from your product streams.

Metal foreign bodies 'contaminate' your product, and they can also cause severe damage to your machinery. Rejection of batches is costly, but it can be even more costly if the foreign bodies are not removed, making it necessary to conduct a product recall. You will then be faced with enormous costs and reputation damage.

Examples of ferrous metal contaminants / foreign bodies:
pieces of iron, steel or stainless steel in the raw material, staples, nails and screws, bolts and nuts that have vibrated loose, wear of the moving parts, rust, corrosion.

Magnetic separators filter/trap and remove ferromagnetic foreign bodies from your product streams, in order to guarantee high product quality and prevent damage to machines.

Cleanflow magnetic separator SECA (easy clean) - automatic cleaning | Goudsmit Magnetics

Magnetic separator or metal detector?

Why and when should you use a magnetic separator instead of a metal detector?

magnetic separator filters/traps (and later removes) or immediately removes the metal contaminants from the product flow. Magnetic separators cause practically no product loss and are suitable for removal of regularly occurring and larger quantities of metal contamination.

metal detector is mainly used as a means of inspection for sporadically occurring metal contamination, or for removing non-magnetic foreign bodies.
A metal detector only detects; to remove the metal particle, the production line has te be stopped, or a rejection mechanism should eject the metal particle – which will also remove product along with it (causing loss of product).

Why use a magnetic separator?

Three good reasons to install a magnet separator

  1. Magnets improve your product quality/purity
    Contamination / foreign bodies in food products can lead to claims, very costly product recalls and reputational damage. And not just in food: even the smallest foreign bodies are undesirable in pharmaceutical, chemical or mineral bulk streams and lower the quality of the finished product.
  2. Magnets prevent for damage to your production machinery
    By placing a magnetic separator before the inlet of your production machinery – such as grinders, ball mills, pin mills, calenders and crushers – you prevent damage to your machinery and production standstill. A magnetic separator very effectively filters metal contaminants from your bulk stream; they function continuously and provide a high level of operational reliability.
  3. Magnets prevent dust explosions
    Fine dust in combination with oxygen and a source of ignition can result in dust explosions. By filtering metal particles out of the product flow in advance, magnets remove an important ignition source: the impact of metal on metal. This prevents serious injuries (or worse) and high costs from damage to your machines.

Many of our magnetic separators are suitable for use in ATEX zone 20/21. As a certified manufacturer of ATEX equipment, Goudsmit has an externally certified quality assurance system that guarantees the explosion safety of our magnetic separators.

Bar / rod magnetic filters  in grain landscape brush | Goudsmit Magnetics

Separator types

What different types of magnetic separators are there?

1. Plate/block magnets

Magnet separators with plate or block magnets (also called suspension magnets)

Magnet separators with plate / block magnets have a deeply penetrating magnetic field for capturing ferromagnetic metal particles as small as 1 mm, with the plate magnets mounted on the outside of the pipe channel. Plate magnets, chute magnets and external pole magnets are used in pipeline transport. These systems are always permanently magnetic.


Suspension magnets (large block magnets) without and with a conveyor system (overband magnets) pull pieces of metal out of a material stream on a passing belt; these types can be found in the main group Magnetic Recycling & Sorting. Magnetic separators with block magnets can be permanently magnetic or electromagnetic.

2. Bar/rod magnets

Magnet separators with bar or rod magnets (also called magnetic fingers)

Magnetic separators with magnetic bars/rods have an extremely powerful yet less deeply penetrating magnetic field. They are mounted inside the product channel, this way making direct contact with closely passing product. Magnetic bar separators are therefore best suited for trapping small ferrous contaminants and even weakly magnetic (e.g. cold-worked stainless steel) contaminants as small as 30 µm out of bulk streams in filling openings and pipelines.


Our magnetic grids/grates, Cleanflow magnets and magnetic filters make use of bar magnets.

3. Cylindrical types

Magnetic separators with cylindrical magnets

Magnetic separators with cylindrical magnets are used in our bullet magnets, drum magnets, head pulley magnets and Eddy Current non-ferro separator. With the exception of the bullet magnet, these magnets do not hold the captured metal particles (for periodic disposal) but rather dispose of them directly and continuously. They are therefore capable of separating or sorting large quantities of metal particles.


Bullet magnets and drum magnets can be found in the solutions group "Magnetic filtering". Extra robust types of drum magnets, magnetic head pulleys and Eddy Current separators can be found in the solutions group Magnetic Recycling & Sorting.

Different types of magnetic separators | Goudsmit Magnetics