Magnetic stirrer drives

Magnetic stirrer drives (LEMSD) are agitator drives with an integrated magnetic coupling for pressurized laboratory reactors. They mix chemicals of low to high viscosity inside a closed vessel without a rotating seal on the pressure boundary. Two sizes are listed, 75 Ncm with a DC motor and 300 Ncm with an AC motor, each with an integrated motor and speed controller.

How it works

Torque passes from the external motor to the stirrer shaft through a closed containment wall. An outer rotor carrying permanent magnets turns around a sealed chamber; the inner rotor on the stirrer shaft follows it synchronously. The shaft never penetrates the pressure boundary, so there is no packing gland or mechanical seal to leak or wear. The integrated controller sets stirrer speed, 0 to 2000 rpm or 0 to 3000 rpm depending on the size.

The drives cover full vacuum to 500 bar (6000 psi) and -50 °C to +400 °C. Wetted materials are stainless steel, Hastelloy, tantalum, titanium or ceramic, chosen for the medium. The same drives fit new reactors and retrofits within the Coretest magnetic drive coupling range, which also includes the M, MM, MG and MMG series drives for higher torque, separate magnetic couplings, stirring shafts and metal-free inert drives.

What is included

• Stirrer drive with integrated magnetic coupling
• Integrated motor, 75 Ncm DC or 300 Ncm AC
• Speed controller

Specify for your project

• Reactor make, head connection and mounting
• Working pressure and temperature at the coupling
• Required torque and speed range
• Wetted material for the medium
• Stirring shaft and impeller type
• Motor supply and any hazardous area requirement

This description defines the product family. Guaranteed performance, included hardware, exclusions, interfaces and acceptance criteria are stated only in the project-specific technical proposal and approved datasheet.