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Bottom Magnetic
Agitator

In sterile processing, the greatest threat to your batch comes from the outside world. Traditional mechanical seals are dynamic barriers; they wear, they require barrier fluids, and ultimately, they represent a "managed risk" of contamination.

The bio-m® BMA (Bottom Magnetic Agitator) removes this risk entirely. By replacing the physical shaft entry with a hermetic magnetic coupling, we create a closed system that is physically incapable of leaking.

This is the "Daily Driver" of the modern pharmaceutical industry. Scalable from 2L pilot vessels up to 150,000L industrial tanks, the BMA delivers the torque and mechanical authority of a traditional shaft mixer, but with the absolute sterility of a magnetic drive. It is the default choice for 90% of critical applications where batch loss is not an option

Advantages

Operational Safety Margins

Internal destructive testing has confirmed that the standard bio-m® bearing system withstands dry-running for over 100 minutes before mechanical seizure. While dry operation is outside standard operating procedures, this significant safety buffer protects the asset against accidental startups or drainage errors, ensuring robust performance under real-world conditions.

Sustainable Asset Lifecycle

We design for longevity rather than replacement. Although the Zirconia (ZrO2) and Silicon Carbide (SiC) bearing surfaces are engineered for long-term wear resistance, the outer bearing assembly remains fully accessible and replaceable on-site. This maintainability ensures the agitator remains a viable, high-performance asset for the lifespan of the vessel.

Process Integrity Monitoring

For critical GMP applications, process validation requires absolute certainty. Our optional Speed Sensor Unit utilizes a Hall effect sensor to detect a trigger magnet located inside the impeller, providing a true confirmation of rotation. This distinguishes the system from standard drive-shaft measurements, ensuring the automation system receives verified feedback from inside the tank.

Material Purity Strategy

To eliminate the risk of coating detachment or particulate generation, we utilize solid ceramic bearing materials rather than surface-coated alternatives (such as DLC Diamond-like coatings). A study by the ZHAW - Zurich University of Applied Sciences confirms that our specific Zirconia/SSiC tribology generates no detectable particulates, ensuring the sterile integrity of the product is never compromised by the equipment materials.

Optimized Hygienic Geometry

A critical design parameter in magnetic mixing is the gap between the drive magnet (can) and the impeller. We prioritize hygienic performance by engineering a widened gap that maximizes fluid flow and CIP efficiency behind the impeller. High-grade magnetic materials are utilized to maintain full torque transmission without compromising this essential cleaning clearance.

Thermal Expansion Management

To prevent "thermal breathing"—the creation of non-sterile voids during temperature cycling (SIP)—we match the thermal expansion coefficient of our Zirconia female bearings to that of the stainless steel housing. This material compatibility allows for high-precision fits that ensure a almost gapless air pocket, bacteria-tight construction.

Strategic Manufacturing Agility

As a manufacturer with full control over our production chain, Liquitec retains the flexibility to adapt standard designs to specific project constraints. We view non-standard requirements—such as specific shaft lengths or flange adaptations—as engineering parameters rather than obstacles. This vertical integration allows us to deliver customized, high-precision solutions with the reliability of a standard product.

Flange Integration

Solving the Access Problem

The interface between the tank and the agitator is not just about containment; it is about
accessibility. We offer solutions that eliminate the need for dangerous tank entry:

The Hermetic Standard
(F1 - Weld-In Can)

The default for maximum containment. The shell is welded directly into the vessel bottom

The Serviceable
(F2 - Plug-In Can)

Ideal for vessels too small to enter (no hand-hole access) or too large for safe technician entry. This design allows you to remove the containment shell and service the bearing seals entirely from the outside, eliminating confined space risks.

The Integral
(F5 - Removable Unit)

A fully removable flange assembly. It allows for the extraction of the entire agitator unit from the tank bottom, offering total maintenance freedom without ever breaching the vessel top.

Magnetic Safety Systems
Handling powerful magnetic drives carries risks. We offer
engineering solutions to protect your team and plant​
01
Standard(BMA 4000+)
Large units come standard with a Driver Magnet Descent System. This mechanism creates a "magnetic break," allowing the safe, controlled lowering of the drive magnet away from the vessel to prevent injury or equipment damage.
02
Optional(Up to BMA 2500)
For smaller and medium sizes using the Bayonet System, the descent mechanism is available as an option. It adds an extra layer of safety for operators decoupling the drive unit during maintenance.  

Motor Technology: A Consequence of Your Process
We supply the torque your infrastructure demands. Beyond
standard AC drives, we offer specialized options.

  • Pneumatic Drives
    Available for environments where compressed air is the preferred power source or for specific explosion-proof requirements.
  • DC Motors
    ​    High-efficiency direct current options for specific pilot or portable skid applications.
  • Wash down Motors
    ​    Stainless steel encapsulated motors for clean rooms and ultra pure areas
  • Servo Drives
    Closed-loop drive for highes accuracy and flexibility
Impeller Geometries: The Right Tool for the Job
​We invite you to consult with our engineering team to select
the exact geometry for your rheology. Our portfolio includes:
bio-m
Standard (ST1)
 The universal solution for mixing and heat transfer.
Marine
Propeller (MP)
 For gentle axial flow and cell culture applications.
 Rotek
(RT)
  Medium shear force for faster buffer preparation.
Rotor Stator
(RS)
 High shear force for dispersion and
emulsification.
Dissolver
(DS)
 Saw-tooth geometry for cutting and
dissolving solids.
High Efficiency
(HER)
 Optimized for maximum flow with
minimum energy input.

Materials & Alloys Standard:
1.4435 (AISI 316L)


For corrosive media, we manufacture in Hastelloy C22 (2.4602), 1.4539 (904L), or Duplex among others. If your process chemistry requires it, we can build it.

How to Order bio-m® BMA Bottom Magnetic Agitator

bio-m® BMA Bottom Magnetic Agitator components can be selected based on component type, pipe standard, nominal size, clamp diameter, material, surface finish, ferrule length, gasket material, and clamp type.

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