Magnetic bar (BMN)

In brief

• The neodymium magnetic bar (BMN) is a neodymium magnet, usually encapsulated in a stainless steel tube with an outside diameter of 25 mm.
• It captures ferromagnetic particles in food processing, pharmaceuticals, chemicals, recycling, plastics processing, and water and pulp treatment.
• The particles stay on the bar until manual cleaning, which is done by removing the bar from its housing and wiping it.

food processing, chemicals, separation

• Applications
• Operating principle
• Recommendations for use
• General features
• Case studies

Applications

Neodymium magnetic bars are used in many industrial sectors:

• Food processing industry: to remove metal contaminants from bulk or liquid products.
• Pharmaceutical industry: to ensure the purity of medicines and active ingredients.
• Chemical industry: to remove ferrous particles from chemical powders and liquids.
• Recycling industry: to separate ferrous metals from other materials.
• Plastics industry: to clean plastic granules before processing.
• Water and pulp treatment: to remove ferrous particles from water filtration systems.

Operating principle

The neodymium magnetic bar works as follows:

• The magnetic bar consists of an extremely powerful neodymium magnet, usually encapsulated in a stainless steel tube (Ø 25 mm outside diameter).
• It generates an intense magnetic field around it.
• When materials containing ferromagnetic particles pass nearby, these particles are strongly attracted and held by the bar.
• Non-magnetic materials continue on their way unaffected.
• The ferromagnetic particles stay on the bar until it is cleaned manually.
• Cleaning is generally done by removing the bar from its housing and wiping off the collected particles.

Recommendations for use

To get the best performance from a neodymium magnetic bar, follow these recommendations:

• Positioning: place the bar in zones of turbulent flow to maximise contact with the material.
• Regular cleaning: set up a cleaning schedule based on the amount of contaminants in your materials.
• Careful handling: because of their high magnetic force, handle the bars with care to avoid injury or damage to equipment.
• Temperature control: avoid exposure to excessive temperatures, which could affect the magnetic properties.
• Multiple installation: for greater efficiency, consider installing several bars in series.

General features

Neodymium magnetic bars have several distinctive features:

• High magnetic strength: neodymium magnets provide a much stronger magnetic field than conventional magnets.
• Compact design: their high magnetic force delivers superior performance in a compact format.
• Versatility: available in various sizes and magnetic strengths to suit a range of applications.
• Energy efficiency: no power supply required for operation.
• Easy installation: can be easily integrated into existing systems.
• Corrosion resistance: generally clad in stainless steel for improved durability.
• High retention capacity: can hold a large quantity of ferromagnetic particles before cleaning is required.
• Cost-effectiveness: an effective magnetic separation solution at a relatively low cost.

Benefits

• Proven magnetic performance
• Material suitable for food applications
• No maintenance required, cleaning only

Services

• Assistance with industrial commissioning
• Spare parts stock
• Fast after-sales service response
• Installed base monitoring and periodic performance checks

Frequently asked questions

How does a BMN neodymium magnetic bar work?

It consists of a very powerful neodymium magnet, usually encapsulated in a stainless steel tube with an outside diameter of 25 mm. It generates an intense field that attracts and holds ferromagnetic particles, while non-magnetic materials continue on their way.

In which sectors are BMN magnetic bars used?

They are used in food processing, pharmaceuticals, chemicals, recycling, plastics processing (cleaning of granules) and water and pulp treatment. They remove metal contaminants from bulk or liquid products.

How do you clean a BMN magnetic bar?

The particles stay on the bar until manual cleaning, which generally consists of removing the bar from its housing and wiping off the collected particles. A cleaning schedule should be set up according to the amount of contaminants.

Does the BMN bar require a power supply?

No, it requires no power supply to operate. It can be easily integrated into existing systems.

What precautions should be taken when installing and using BMN bars?

They should be placed in zones of turbulent flow, handled with care because of their high magnetic force, and kept away from excessive temperatures that could affect the magnetic properties. For greater efficiency, several bars can be installed in series.

Technical data

Model	Contact intensity	Attraction distance	Max. temperature
BMN-40 (N40, Br = 12 800 G)	**11 000 Gauss**	< 25 mm	80 °C
BMN-55 (N55, Br = 15 000 G)	**13 000 Gauss**	< 25 mm	80 °C