Advantageous solutions in mixing

Published: 19-Jan-2002


A magnetically driven, tank bottom-mounted mixer has many advantages over a top mounted, shaft-driven model, says UK company NovAseptic, especially for processes needing sterile conditions. The most striking benefit of the magnetic drive is that it allows the total integrity of the tank, with no shaft lead through and scale that may leak or shed particles, thereby challenging the sterility of the vessel and its contents, or contaminate them.

Magnetically driven mixers have other advantages which are not related to sterility:

  • the ease of demountability; a top-driven mixer needs a mechanical lifting device to remove it from the vessel;

  • the ability to agitate even when the vessel is almost empty; as the agitator is bottom-mounted it is almost flush with the bottom of the vessel;

  • an increase in the stability of the tank by having the weight of the mixing device below the centre of gravity;

    • The NA-mixer, manufactured by NovAseptic, is a bottom-mounted, magnetically driven mixer, designed for liquid mixing applications where the following requirements must be fulfilled:

  • ensure that no microbial contamination from the outside to the inside of the tank can occur;

  • ensure that no product can leak out from the tank in terms of droplets or aerosols;

  • minimum particle shedding from the rotating parts inside the tank;

  • the tank must be cleaned in place (CIP)and sterilised in place (SIP);

  • the product is a non-stabilised suspension that requires continuous mixing down to the last drop during its processing.

    • An in-place cleanability test carried out by an independent research institute according to the test procedure of the European Hygienic Equipment Design Group (EHEDG) showed that the NA-mixer is at least as cleanable in-place as the reference pipe under the described conditions. The test was done both by spray ball and by submerging the mixer in the detergent solution. The EHEDG say that the NA-mixer will be contamination free when the cleaning procedure is designed for the tank or pipe system.

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