Simular // Heat-Flow Reaction Calorimeter
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Stirring Options

Stirring Options


The AutoLAB range of jacketed reactors, employ powerful overhead stirrer motors. The standard motor delivers 50-2000rpm with 20Ncm of continuous torque.

The standard motor is adequate for vessels up to 3 litres involving liquids with low to moderate viscosity and even 10 litres with normal (water-like) viscosity liquids. Higher rated motors are available as standard options up to a 700Ncm/540rpm model for extreme applications.

The torque sensor is mounted in motor head and measures directly the changes in viscosity and hence also allows direct calculation of stirring power.

An automatic motor cut out prevents motor burn-out and damage to other equipment.

The motor is fitted with a remote sensor for software monitoring of both speed and torque, as well as control of speed.

Stirrer Couplings

Couplings are fitted to the lid of the reactor seal the reactor at the spinning stirrer shaft. Mechanical coupling seal on the spinning shaft via PTFE bearings. For higher pressure (or very low vacuum) applications, this can be a source of gas leakage and a magnetic coupling is required. Magnetic coupling divide the stirrer shaft in two with a hard seal in between and stirring motion is transferred across the seal via spinning magnets.

Atmospheric Reactors

  • Mechanical Coupling Standard
  • Magnetic Coupling Optional
  • Range of Torque Options

High-Pressure Reactors

  • Magnetic Coupling as Standard
  • Range of Torque Options

Whether a mechanical or mag-drive coupling has been used, the motor is connected to the system via HEL's tool-less motor coupling. This allows the motor to be swung free of the reactor without the need for spanners or wrenches and allows the lid to be removed, quickly and with no fuss.


Stirrers are available in a range of architectures and materials. Typically PTFE-coated stainless steel is use, but glass and hastelloy are also available as standard. In terms of shapes, stirrer blades are available as....

  • Rushton ("paddlewheel")
    • angled blades upflow/downflow
    • straight blades
  • Pitch blade
    • 4 - 6 blades
    • typically downflow
  • Anchor
    • good for higher viscosity mixing
  • Helicoil
    • a helical spiral which mixes with a "screw" motion