Hei-TORQUE Overhead Stirrers

Hei-Torque Core

• The compact design allows for integration in closed systems, such as fume hoods, reactors, or production systems
• Suitable for low- to medium-viscosity media up to 25 l
• The large diameter of the chuck (10 mm) allows you to use even large impellers and VISCO JET® tools.

Hei-TORQUE Expert

Ideal for standard stirring tasks.

Stirrer with 100, 200 or 400 Ncm torque. Designed to mix and disperse media that require non-reproducible results in high-viscosity applications

Hei-TORQUE Expert

• Indication of torque output to monitor viscosity changes
• Digital 2.4” display for ease of operation
• Constant speed even under changing loads
• Safe start and stop of operation via slide touch panel to avoid unintended stirring

Hei-TORQUE Ultimate

Ideal for demanding tasks which require reproducible results or software control.

Stirrer with 100, 200 or 400 Ncm torque.

Menu driven interface with several options for individual settings such as ramps and interval operation.

USB and RS 232 interfaces for connection to computers.

Digital 3.2” display for ease of operation:
• Allows for pre-programmed profiles which can be saved
• Accurate torque indication shows any viscosity changes
• Watch rpm and torque graphs live

Hei-TORQUE Ultimate

All performance-related parameters can be set individually:

• Intensity of the start operation – from slow to fast
• The rotational speed can be limited to avoid splashing media
• The torque limit prevents damage to the impeller, e.g. when using fragile impellers in high viscous media
• Newest motor generation provides maximum power at minimum noise level
• Safe start and stop of operation via slide touch panel to avoid unintended stirring

Browse our range of products

For chemical synthesis, process development, evaporation and work-up

Browse the range

Hei-TORQUE Accessories

• Telescopic stand
• Clamp
• Flex coupling
• Flexible shaft
• Shaft guard
• Shaft guard adapter set
• Stand S2 XXL
• Universal stand S2
• Stirrer guide (NS 29/32 PTFE)

Stirrer Tools & Paddles

Range of impellers

Stirrer Tools & Paddles

• TR 20 Radial-Flow Impeller
• TR 21 Radial-Flow Impeller
• AR 19 Anchor-Type Impeller
• VISCO JET® – 60 mm
• VISCO JET® – 80 mm
• VISCO JET® – 80 mm (POM)
• VISCO JET® – 120 mm
• VISCO JET® – 120 mm (POM)
• VISCO JET® CRACK – 80 mm
• VISCO JET® CRACK – 120 mm

Webinar: Optimising Mixing: Techniques for Better Reactions

The webinar will cover the importance of stirring and its impact on reaction rates, product quality, and efficient heat transfer. We will explore the benefits and limitations of magnetic stirring, how to select the right stirrer bar, and the use of evaluation kits.

Attendees will also learn about the advantages of overhead stirring for both small and large volumes, especially in viscous and heterogeneous reactions, and discover the impact of different impellers on mixing.

Insights into scaling up from laboratory to production scale and considerations for technology transfer will be shared. Additionally, we will compare high shear vs. low shear mixers, radial vs. axial flow impellers, and understand the importance of vessel geometry and baffling for optimal mixing.

Webinar: Benefits of overhead stirring on a small scale

Join us to discuss the benefits of overhead stirring on a small scale:

• Are you using magnetic or overhead stirring for small scale research and process development?
• What’s the difference and why does it matter?
• What factors can be affected when moving from magnetically stirred reactions to overhead and how might this help improve your chemical development and scale up?

Webinar: Stirring viscous reactions - save space and time with Tornado

Do you require mechanical stirring on small scale reactions? E.g. viscous materials, heterogeneous mixtures, fragile solids?

Join us to see the Tornado Overhead Stirring System in action. Save time and space for the overhead stirring of multiple reactions in round bottom flasks.