Overhead Stirrer
High-capacity overhead stirrer with 20L volume capability, variable speed control (200-3000 rpm), and precision timing for viscous mixing applications up to 10,000 mPas.
Louise Corscadden, PhD
Director of Science · ConductScience
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The ConductScience Overhead Stirrer is a robust benchtop mixing instrument designed for high-viscosity applications in research and analytical laboratories. With a 20L maximum volume capacity and variable speed control from 200 to 3000 rpm, this DC motor-driven system provides precise mixing for viscous solutions up to 10,000 mPas. The unit features ±3 rpm speed control accuracy and programmable timing from 1 minute to 99 hours 59 minutes, with continuous operation capability for extended protocols.
The LCD display provides real-time monitoring of both speed and elapsed time, while the universal power supply (AC 100-240V, 50/60Hz) ensures compatibility across international laboratory settings. At 7 kg net weight with a compact footprint (200×315×600mm), the stirrer delivers consistent torque through its 60W motor system, making it suitable for synthesis reactions, emulsion preparation, and homogenization procedures requiring controlled mechanical agitation.
How It Works
The overhead stirrer operates through direct mechanical coupling between a DC motor and the stirring shaft, providing consistent torque across the entire speed range. The motor's rotational force is transmitted through a rigid coupling system that maintains speed accuracy to ±3 rpm, ensuring reproducible mixing conditions for viscous samples up to 10,000 mPas.
Speed control is achieved through electronic regulation of the DC motor's power input, with digital feedback maintaining the set rotation rate regardless of load variations. The timing system operates independently of the motor control, allowing for precise protocol execution from 1 minute to continuous operation. The LCD display provides real-time feedback of both parameters, enabling researchers to monitor mixing conditions throughout the procedure.
The stirrer's design accommodates various vessel geometries through its overhead configuration, allowing the stirring element to be positioned optimally within the sample. This arrangement provides superior mixing efficiency compared to magnetic stirring systems when dealing with high-viscosity materials or large volume applications.
Features & Benefits
Automation Level
- semi-automated
Maximum Volume
- 20L
Rotation Range
- 200~3000rpm
Speed Control Accuracy
- ±3rpm
Timing Range
- 1~99h59min/continuous
Speed/Time Display
- LCD
Motor Type
- DC motor
Stirring Maximum Viscosity
- 10000mPas
Weight
- 8.5KG
External Size(W*D*H)
- 200*315*600mm
Packing Size(W*D*H)
- 450*345*155mm
Brand
- ConductScience
Research Domain
- Analytical Chemistry
- Environmental Monitoring
- Food Science
- Materials Science
- Microbiology
- Pharmaceutical QC
Power/Voltage
- 60W
Weight
- 7.0 kg
Dimensions
- L: 60.0 mm
- W: 20.0 mm
- H: 31.5 mm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Maximum Volume Capacity | 20L maximum volume | Entry-level models often limited to 5-10L capacity | Enables large-batch processing and reduces the need for multiple mixing runs in high-throughput applications |
| Speed Control Range | 200-3000 rpm with ±3 rpm accuracy | Basic models may offer wider tolerance ranges | Precise speed control ensures reproducible mixing conditions critical for protocol standardization |
| Viscosity Handling | 10,000 mPas maximum viscosity | Lower-power units often limited to lower viscosity ranges | Handles challenging high-viscosity samples that would stall less powerful mixing systems |
| Timing Options | Programmable 1-99h59min plus continuous mode | Basic models may lack programmable timing | Enables unattended operation and precise protocol timing for extended procedures |
| Display System | LCD showing speed and time simultaneously | Simple models may have basic analog displays | Real-time monitoring of both parameters improves experimental control and documentation |
| Motor Type | 60W DC motor system | Lower wattage options available | Consistent torque delivery across speed range ensures reliable performance with viscous samples |
This overhead stirrer combines high-capacity mixing (20L), precise speed control (±3 rpm), and programmable timing in a compact benchtop format. The 60W DC motor system and 10,000 mPas viscosity handling capability position it for demanding research applications requiring reliable mechanical agitation.
Practical Tips
Verify speed accuracy periodically using a tachometer or strobe light, particularly after extended use with high-viscosity samples.
Why: Maintains measurement traceability and ensures reproducible mixing conditions across experiments
Clean stirring shafts immediately after use with viscous or reactive samples to prevent buildup that could affect balance.
Why: Prevents vibration issues and extends equipment lifespan while maintaining mixing efficiency
Match impeller size and design to sample viscosity and vessel geometry for optimal mixing efficiency.
Why: Improves homogenization effectiveness and reduces mixing time for better experimental throughput
Secure the sample vessel during operation and ensure adequate clearance around the rotating shaft.
Why: Prevents accidents and sample spillage, particularly important with high-viscosity or hazardous materials
Record actual mixing speed and duration from the LCD display rather than relying solely on set points.
Why: Improves experimental documentation and enables better reproducibility assessment
If speed drops below set point during mixing, check for excessive sample viscosity or impeller fouling.
Why: Identifies potential sample preparation issues before they compromise experimental results
Allow the motor to reach stable speed before starting timing protocols for critical applications.
Why: Ensures consistent mixing conditions from the beginning of timed procedures
Setup Guide
What’s in the Box
- Overhead stirrer main unit
- Power cord
- Stirring shaft (typical)
- User manual
- Warranty documentation (typical)
Warranty
ConductScience provides a standard one-year manufacturer warranty covering defects in materials and workmanship, with technical support available for installation and operation guidance.
Compliance
References
Background reading relevant to this product:
What stirring elements are compatible with this overhead stirrer?
The unit accepts standard overhead stirring shafts and impellers designed for viscous mixing applications. Consult product datasheet for specific shaft diameter compatibility and recommended impeller designs for different viscosity ranges.
Can this stirrer maintain consistent speed with varying sample viscosity?
Yes, the DC motor system with electronic speed control maintains ±3 rpm accuracy regardless of load variations within the 10,000 mPas maximum viscosity specification.
What is the minimum sample volume that can be effectively mixed?
Minimum volume depends on vessel geometry and stirring element selection. While maximum capacity is 20L, effective mixing of smaller volumes requires appropriate impeller positioning and vessel selection.
How does the timing function operate during continuous mode?
Continuous mode bypasses the programmed timer, allowing indefinite operation until manually stopped. The display continues showing elapsed time and current speed parameters.
What maintenance is required for optimal performance?
Regular cleaning of stirring elements, periodic inspection of motor coupling alignment, and verification of speed accuracy comprise the primary maintenance requirements.
Can multiple units be synchronized for parallel processing?
Each unit operates independently with its own speed and timing controls. Synchronization would require external timing protocols coordinated by the user.
What safety features are included for high-viscosity applications?
The motor system includes overload protection, while the robust construction prevents shaft deflection under high-viscosity loads. Consult operation manual for specific safety protocols.
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