Zum Inhalt springen
Your Dynamic Snippet will be displayed here... This message is displayed because you did not provide both a filter and a template to use.

Top Mounted Magnetic

Agitators (TMAi/TMAe)

The Exception to the Rule. At Liquitec, we believe the bottom-mounted magnetic agitator is the gold standard for sterile mixing. It is the most hygienic, stable, and ergonomic solution for 90% of pharmaceutical applications. However, process reality does not always follow the rules.

Engineered for Constraints. When your tank geometry, complex piping layout, or specific process chemistry makes a bottom entry impossible, we deploy our Top-Mounted Series. We do not position this as a competitor to our standard BMA line, but as a specialized, high-performance tool for specific engineering challenges. Whether you are retrofitting a legacy vessel or designing a skid with zero ground clearance, the Top-Mounted series brings hermetic magnetic safety to the top flange.

Advantages

The Obstruction - Free Bottom

In processes requiring absolute drainage or complex bottom piping, a bottom-mounted mixer can be a physical obstacle.

The Constraint: Bottom magnets and their weld-in flanges occupy valuable space on the tank bottom and can interfere with drain valves or sumps in small vessels.

The Solution: The TMA moves the drive train to the roof. This leaves the tank bottom completely free, allowing for optimized, center-drain geometries and simplifying the layout of harvest piping.

 Handling Abrasive Solids

In crystallization or suspension processes, heavy solids settle and pack at the tank bottom.

The Risk: Starting a bottom-mounted mixer while the bearing is buried in abrasive "sludge" can lead to rapid ceramic wear or failure.

The Solution: With a Top-Mounted drive, the bearings are located safely in the headspace, far from the sediment zone. The impeller hangs down and, upon startup, lifts the solids away from the bottom without the bearing ever grinding against the particulates.

 The Retrofit Solutions

The industry is filled with legacy vessels operating with leaking mechanical seals on top flanges.

The Challenge: Cutting a hole in the bottom of a certified pressure vessel to install a bottom mixer is often a regulatory and financial impossibility.

The Fix: We engineer magnetic drive units that fit your existing DIN or ANSI top flange patterns. This allows you to upgrade from a mechanical seal to a hermetic magnetic drive using the existing vessel interface-preserving your tank's pressure certification.

 Managing the Cantilever

Top-mounting a magnetic shaft without a bottom support introduces specific physics: deflection and thermal expansion

The Liquitec Standard: We calculate the critical speed and shaft diameter for every unit. We are transparent about the limits: without a Lower Bearing Support (LBS), the shaft length is physically limited by the critical speed. We engineer within these safe limits to ensure the shaft remains stable without whipping.

Power Density: (Torque Range)

We size the magnetic coupling to the viscosity and volume of your specific process,
ensuring you never pay for unneeded weight on your top flange.​


  • The Range
    From micro-scale 30 Ncm drives for pilot reactors up to 2,500 Ncm for industrial blending.

  • The Benefit
    This wide granularity allows us to match the drive train to the shaft length, minimizing the "pendulum weight" on the top nozzle.

The Interface: Plug-In Simplicity

We have standardized the most versatile interface for top-mounted applications.

The Solution (F2 - Plug-In Can)
Our standard design utilizes a Plug-In Containment Shell. 

The Advantage

This design allows the hermetic shell to be inserted through
the nozzle and bolted to the existing DIN or ANSI flange. It
eliminates the need for welding, making it the perfect
"Drop-In" retrofit for upgrading legacy vessels from mechanical
seals to magnetic drives.

Impeller & Connection Logic
We adapt the mixing element to the process goal, but
mechanics dictates the assembly.
The 
 Geometry 
 Whether you require Low-Shear Suspension (Marine Propeller) or Gas Dispersion (Rushton Turbine), we calculate the optimal impeller diameter based on your process data.
The 
 Connection 
 The method of attaching the impeller to the shaft (Welded vs. Detachable) is not a simple catalog choice. It is strictly limited by the shaft dimensions and the nozzle diameter. Our engineering team determines the viable connection type to ensure mechanical stability and installation feasibility.
Drive Technology (The Headroom Solvers). 
When top-mounting, vertical clearance is often the enemy. We offer a
range of drive architectures to solve your specific layout constraints:
01
Low-Profile Solutions
For skids with limited ceiling height, we can deploy compact planetary gear systems that significantly reduce the vertical footprint compared to standard worm gear system or servo drives.
02
Cleanroom & Safety
For open cleanrooms or hazardous zones, we configure the drive with Stainless Steel housings or Pneumatic motors for explosion-proof safety. Consult our engineering team to define the exact drive architecture for your zone.

Surface Perfection as Standard

Because top-mounted shafts are difficult to inspect manually, the surface finish must be flawless.​

The Standard
We do not compromise on the finish. All wetted parts are supplied with a surface roughness of Ra < 0.4 µm, finished with Electropolishing (E2). This ensures maximum cleanability and corrosion resistance for the long, suspended shaft. ensuring your CIP & SIP cycles are effective every time.

How to Order bio-m® Top Mounted
Magnetic Agitator

bio-m® Top Mounted Magnetic Agitator can be selected based on your application, vessel volume, viscosity, mixing task, surface and material. A custom made piece of equipment to perfectly fit your process.

Request more information

Contact liquitec
Select a category filter and template.
Select a category filter and template.