Overhead Stirrer OS10-Pro
High-torque overhead stirrer capable of mixing up to 10L volumes with viscosities up to 10,000 mPas, featuring precise speed control and OLED display for reproducible laboratory mixing applications.
Louise Corscadden, PhD
Director of Science · ConductScience
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Key Specifications
Full details →- Model fit
- Configured during quote
- SKU family
- BIO-0785
- Sizing
- 62.3 x 37.3 x 23.8 cm
- Ordering
- Online checkout and quote request available
- Category
- Benchtop Instruments
- Build notes
- Confirm accessories, station layout, and support needs before purchase
The Overhead Stirrer OS10-Pro is a robust benchtop mixing instrument designed for laboratories requiring consistent, high-torque stirring of viscous solutions and large volumes. With a maximum stirring capacity of 10 liters and torque output of 20 N·cm, this DC brush motor-driven system handles viscosities up to 10,000 mPas while maintaining precise speed control from 200 to 2500 rpm.
The integrated OLED display provides real-time speed monitoring with ±1 rpm resolution, enabling researchers to maintain reproducible mixing conditions across experimental protocols. Automatic overload protection prevents motor damage during high-viscosity operations, while the IP21 protection class ensures reliable performance in standard laboratory environments.
How It Works
The OS10-Pro employs a DC brush motor system that delivers controlled rotational force through a direct-drive mechanism to the stirring shaft. The motor's torque output of 20 N·cm enables effective mixing of high-viscosity solutions by overcoming fluid resistance while maintaining stable rotation speeds. Variable speed control from 200 to 2500 rpm allows researchers to optimize shear rates for different fluid properties and mixing requirements.
The integrated control system monitors motor performance and automatically stops operation if overload conditions are detected, preventing damage from excessive resistance or mechanical binding. The OLED display continuously shows actual rotation speed with ±1 rpm precision, enabling researchers to verify and maintain consistent mixing conditions throughout experimental procedures.
Features & Benefits
Automation Level
- manual
Item No.
- 8055400200
Max. Stirring Quantity(H₂O)
- 10L
Speed Range
- 200~2500rpm
Speed Display
- OLED
Speed Display Resolution
- ±1rpm
Max. Viscosity
- 10000mPas
Motor Type
- DC brush motor
Max. Torque
- 20N·cm
Overload Protection
- Automatic stop
Protection Class
- IP21
Consumption
- 50W
External Size(W*H*D)
- 373*238*623mm
Brand
- ConductScience
Research Domain
- Analytical Chemistry
- Environmental Monitoring
- Food Science
- Materials Science
- Microbiology
- Pharmaceutical QC
Power/Voltage
- AC100~240V, 50/60Hz
Weight
- 4.8kg
Weight
- 4.8 kg
Dimensions
- L: 62.3 mm
- W: 37.3 mm
- H: 23.8 mm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Maximum Torque Output | 20 N·cm | Entry-level models often provide 5-15 N·cm | Higher torque enables mixing of more viscous solutions and larger volumes without motor stalling or inconsistent mixing patterns. |
| Speed Display Resolution | OLED display with ±1 rpm precision | Basic models may use analog displays or LED readouts with limited precision | Precise speed monitoring enables reproducible protocols and accurate documentation for regulatory compliance. |
| Viscosity Handling | Up to 10,000 mPas | Lower-end stirrers typically handle 1,000-5,000 mPas maximum | Extended viscosity range accommodates challenging applications including thick polymers and concentrated suspensions. |
| Overload Protection | Automatic motor stop | Basic models may lack overload protection | Prevents motor damage and extends equipment life while providing safety alerts for problematic mixing conditions. |
| Power Supply Compatibility | Universal AC 100-240V, 50/60Hz | Some models require specific voltage ranges | Eliminates need for voltage converters and enables use in international laboratory facilities without modification. |
The OS10-Pro combines high torque capacity with precise digital control and comprehensive safety features. The 20 N·cm torque output and 10,000 mPas viscosity handling capability position it for demanding laboratory mixing applications where magnetic stirrers are insufficient.
Practical Tips
Verify speed accuracy annually using a calibrated tachometer or stroboscope, testing at multiple points across the 200-2500 rpm range.
Why: Speed accuracy is critical for reproducible mixing protocols and regulatory documentation requirements.
Clean the chuck and shaft connection points after each use to prevent buildup that could affect grip or concentricity.
Why: Contamination in the chuck can cause shaft wobble and reduce mixing efficiency while potentially damaging the motor.
Start mixing at low speeds and gradually increase to prevent vortex formation and air entrainment in sensitive solutions.
Why: Sudden high-speed mixing can introduce bubbles or create uneven mixing patterns that affect experimental reproducibility.
If overload protection activates frequently, check for proper shaft alignment and ensure the impeller is not contacting the vessel bottom.
Why: Mechanical interference creates excessive resistance that triggers protection systems and can damage both the stirrer and vessel.
Record actual displayed speed rather than set speed in protocols, as variations can occur under different load conditions.
Why: Actual mixing speed affects shear rates and reaction kinetics, making it more relevant than commanded speed for reproducibility.
Position the stirrer away from overhead fixtures and ensure adequate clearance for shaft removal and cleaning.
Why: Rotating shafts present entanglement hazards, and proper clearance enables safe operation and maintenance procedures.
Select impeller design based on vessel geometry and mixing objective - axial flow for blending, radial flow for dispersion.
Why: Proper impeller selection optimizes mixing efficiency and reduces power consumption while achieving desired homogeneity.
Monitor motor brush condition (DC motor) and replace when excessive sparking or speed irregularities are observed.
Why: Worn brushes reduce motor efficiency and can cause speed fluctuations that compromise mixing reproducibility.
Setup Guide
What’s in the Box
- OS10-Pro overhead stirrer main unit
- AC power cord
- Standard stirring shaft (typical)
- Chuck key for shaft installation (typical)
- User manual and technical documentation
- Calibration certificate (typical)
Warranty
ConductScience provides a standard one-year manufacturer warranty covering defects in materials and workmanship. Technical support is available for installation, operation, and maintenance guidance throughout the product lifecycle.
Compliance
References
Background reading relevant to this product:
What is the maximum viscosity this stirrer can effectively handle?
The OS10-Pro is rated for viscosities up to 10,000 mPas (cP), which covers most laboratory solutions including viscous polymers and thick suspensions. The 20 N·cm torque output ensures consistent mixing even at maximum viscosity.
How accurate is the speed control and monitoring?
The OLED display provides speed indication with ±1 rpm resolution across the full 200-2500 rpm range. This precision enables reproducible protocols and accurate documentation of mixing parameters for regulatory requirements.
Can this unit operate continuously for extended periods?
Yes, the DC brush motor design supports continuous operation with proper maintenance. The automatic overload protection prevents damage during high-load conditions, and the 50W power consumption indicates efficient heat management.
What shaft options are available for different applications?
Consult product datasheet for specific shaft configurations. The chuck system accommodates various shaft diameters and impeller designs optimized for different vessel geometries and mixing requirements.
How does this compare to magnetic stirrers for high-viscosity applications?
Overhead stirrers provide significantly higher torque than magnetic stirrers, making them essential for viscosities above 1000 mPas where magnetic coupling becomes unreliable. The direct mechanical drive eliminates decoupling issues common with magnetic systems.
What maintenance is required for optimal performance?
Regular cleaning of the chuck and shaft components, periodic inspection of motor brushes (DC brush motor), and annual calibration verification are recommended. The IP21 protection simplifies cleaning while protecting internal components.
Can the unit be used with different vessel sizes?
The 10L maximum capacity rating applies to water-like viscosities. Different vessel sizes can be accommodated by selecting appropriate shaft lengths and impeller designs for optimal mixing geometry.
What safety features are included?
Automatic overload protection stops the motor if excessive resistance is encountered, preventing damage and potential safety hazards. The IP21 protection class provides basic protection against liquid drips and solid particles.
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