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Alfa Laval’s new Ultrapure levitated magnetic mixer (MM) eliminates the need for complex bearings and seals and reduces the risk of fouling and downtime for the cleaning and replacing of components.

This is because the MM uses a strong magnetic field to levitate and rotate the impeller.

Inside the body of the impeller, there are permanent magnets that are coupled magnetically through the bottom of the mixing vessel to matching magnets in the drive unit.

Consequently, a seal through the vessel is not required.

The impeller floats on a powerful magnetic field and rotates around a male bearing, which acts purely as a guide.

Thanks to its levitation, there is no direct contact between the female rotating bearing and the stationary male guide bearing.

Drive is provided by a motor mounted externally and is operated via a frequency converter.

Contactless rotation makes the MM much more efficient than conventional, mechanical mixers in several ways, according to the company.

First, without bearings or seals to worry about, the mixer can run dry.

It can also cope with very low levels, ensuring that product is mixed to the last drop and is fully homogenised.

Since every drop that leaves the tank is fully mixed product, there is no residual waste.

As a result, there are no waste disposal costs and minimal environmental impact.

The actual mixer incorporates eight wings to ensure gentle product treatment with minimal shear and to provide efficient pumping even at low revolutions per minute.

Although the need for cleaning is reduced, the unit can be readily cleaned using either cleaning-in-place (CIP) or sterilising-in-place (SIP) technology and is easy to drain.

Unlike other magnetic mixers, the MM does not rely on electrical current to provide the magnetic field.

The impeller, therefore, stays levitated at all times, even in the absence of liquid or electrical energy, and does not need to be stopped for the CIP process.

Alfa Laval's operations are based on leading global positions in the three key technologies of heat transfer, separation and fluid handling. Continuous product development is essential to strengthen competitiveness. About 2.7 per cent of total sales are invested annually in research and development, resulting in 25–30 new product launches a year.

Alfa Laval's products are sold in approximately 100 countries, 50 of which have their own sales organisations. The company has 20 large production units (12 in Europe, six in Asia and two in the US) and 70 service centres.

The customer's peace of mind depends on having the right service setup. For Alfa Laval, service is a total concept that covers everything from supplying the smallest spare part to being a lifetime performance partner. Alfa Laval has a global network with more than 200 skilled service specialists, a broad range of competitive service solutions, unique expertise based on more than 120 years in business and service centres in hundreds of locations in more than 50 countries.

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