Multi-position Hotplate Magnetic Stirrer
Four-position hotplate magnetic stirrer with independent heating and stirring control, supporting up to 3L volumes per position with 200-1500 rpm speed range and LCD monitoring.
Louise Corscadden, PhD
Neuroscience · ConductScience
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The Multi-position Hotplate Magnetic Stirrer provides simultaneous heating and stirring across four independent positions, enabling parallel sample processing in analytical and synthetic workflows. Each position features an aluminum work plate with ceramic coating (φ134mm) driven by a 5W brushless DC motor, supporting stirring volumes up to 3L per channel with speed control from 200-1500 rpm (±20 rpm accuracy).
The system delivers 600W heating power per position with integrated LCD displays for both temperature and speed monitoring. Universal power supply compatibility (100-120V, 60Hz; 200-240V, 50Hz) ensures operation across different laboratory environments. The brushless motor design minimizes vibration and provides consistent stirring performance for extended operation periods required in pharmaceutical synthesis, analytical chemistry, and quality control applications.
How It Works
Each stirring position utilizes a brushless DC motor positioned beneath the ceramic-coated aluminum work plate to generate a rotating magnetic field. When a magnetic stir bar is placed in the sample vessel, the rotating field couples with the stir bar, causing it to rotate and create convective mixing within the liquid. The brushless design eliminates carbon brush wear and provides consistent torque delivery across the 200-1500 rpm operating range.
Heating is achieved through resistive elements integrated into each work plate, delivering up to 600W per position. The ceramic coating on the aluminum plates ensures uniform heat distribution while providing chemical resistance and easy cleaning. Temperature and speed are independently controlled for each position, allowing different experimental conditions to be maintained simultaneously across all four channels.
LCD displays provide real-time monitoring of both temperature and stirring speed, with speed control accuracy maintained within ±20 rpm throughout the operating range. The combination of magnetic stirring and controlled heating enables efficient heat transfer and uniform temperature distribution throughout the sample volume.
Features & Benefits
Automation Level
- semi-automated
Work Plate Dimension
- φ134mm
Work Plate Material
- Aluminum with ceramic coating
Motor Type
- Brushless DC motor
Motor Rating Output
- 5W*4
Heating Power
- 600W*4
Total Power
- 605W*4
Stirring Positions
- 4
Max. Stirring Quantity (H2O)
- 3L*4
Max. Stirring Quantity (H2O) Per Channel
- 3L
Speed Range
- 200-1500rpm
Speed Control Accuracy [rpm]
- ±20
Speed Display
- LCD
Temperature Display
- LCD
Brand
- ConductScience
Research Domain
- Analytical Chemistry
- Environmental Monitoring
- Food Science
- Materials Science
- Microbiology
- Pharmaceutical QC
Power/Voltage
- 100-120V,60Hz;200-240V,50Hz
Weight
- 8.7 kg
Dimensions
- L: 12.7 mm
- W: 70.1 mm
- H: 26.5 mm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Number of Stirring Positions | 4 independent positions | Entry-level models typically offer 1-2 positions | Enables parallel processing of multiple samples, dramatically increasing experimental throughput and efficiency |
| Motor Type and Power | 5W brushless DC motor per position | Basic units often use brushed motors with lower power ratings | Brushless design eliminates maintenance while providing consistent torque for reliable mixing of viscous samples |
| Heating Power Per Position | 600W per channel | Standard hotplates commonly provide 300-400W total power | Higher power density enables faster temperature ramp rates and better temperature stability under load |
| Speed Control Accuracy | ±20 rpm across 200-1500 rpm range | Basic stirrers often lack precise speed feedback control | Accurate speed control ensures reproducible mixing conditions critical for method validation and regulatory compliance |
| Work Plate Design | φ134mm aluminum with ceramic coating | Smaller plates or basic surface treatments are common | Large work surface accommodates bigger vessels while ceramic coating provides superior chemical resistance and heat distribution |
| Display System | Individual LCD displays for temperature and speed per position | Basic models may have single displays or analog controls | Independent monitoring prevents parameter confusion when running different protocols simultaneously across positions |
This unit combines high heating power (600W per position), precise speed control (±20 rpm accuracy), and independent four-position operation in a single platform. The brushless motor design and ceramic-coated work plates provide laboratory-grade reliability for demanding parallel processing applications.
Practical Tips
Verify speed accuracy monthly using a tachometer, checking low (200 rpm), mid (750 rpm), and high (1500 rpm) settings for each position.
Why: Regular calibration ensures maintained accuracy for reproducible experimental conditions and regulatory compliance.
Clean ceramic-coated work plates with appropriate solvents after each use and inspect for chips or wear that could affect heat transfer.
Why: Proper plate maintenance ensures consistent heating performance and prevents cross-contamination between experiments.
Match stir bar size to vessel diameter (typically 1/3 to 1/2 vessel width) and ensure adequate clearance from vessel bottom.
Why: Proper stir bar sizing maximizes mixing efficiency while preventing plate contact that can cause wear or noise.
Allow 10-15 minutes for temperature equilibration before adding temperature-sensitive samples or reagents.
Why: Temperature equilibration ensures uniform heating throughout the vessel and prevents thermal shock to sensitive materials.
If stirring becomes erratic, check for magnetic interference from nearby equipment and ensure stir bar is properly centered.
Why: Magnetic interference can disrupt the coupling between motor and stir bar, leading to inconsistent mixing.
Monitor solution levels during heating to prevent boil-dry conditions that could damage vessels or create safety hazards.
Why: Boil-dry conditions can cause rapid temperature increases that may damage equipment or create hazardous vapor conditions.
Record both displayed and independently verified temperatures and speeds in laboratory notebooks for critical experiments.
Why: Independent verification documents actual operating conditions for method validation and troubleshooting purposes.
Keep motor vents clear of debris and ensure adequate airflow around the unit during extended operation periods.
Why: Proper ventilation prevents motor overheating and extends equipment lifespan, especially during high-power heating applications.
Setup Guide
What’s in the Box
- Multi-position hotplate magnetic stirrer main unit
- Power cord appropriate for region
- User manual and operation guide
- Calibration certificate (typical)
- Set of magnetic stir bars (typical)
- Quick reference card (typical)
Warranty
ConductScience provides a standard one-year manufacturer warranty covering defects in materials and workmanship, with technical support available for operation and maintenance guidance.
Compliance
References
Background reading relevant to this product:
What is the temperature uniformity across each work plate?
Consult product datasheet for specific temperature uniformity specifications. The ceramic-coated aluminum plates are designed for uniform heat distribution, but exact temperature gradients depend on vessel size and contents.
Can different stirring speeds be maintained simultaneously across all four positions?
Yes, each position has independent motor control allowing different speeds from 200-1500 rpm to be set and maintained simultaneously with ±20 rpm accuracy.
What is the maximum temperature capability of the heating plates?
Maximum temperature specification should be confirmed in the product datasheet. Each position provides 600W heating power through the ceramic-coated aluminum work plates.
How does the brushless motor design affect maintenance requirements?
Brushless DC motors eliminate carbon brush replacement and reduce maintenance to periodic cleaning and calibration verification, providing more reliable long-term operation than brushed alternatives.
What vessel types are compatible with the φ134mm work plates?
The 134mm diameter plates accommodate standard beakers, flasks, and reaction vessels up to 3L capacity. Flat-bottomed vessels provide optimal heat transfer and magnetic coupling.
Can the unit operate continuously for extended reaction periods?
The brushless motor design and robust heating elements support continuous operation, though specific duty cycle recommendations should be confirmed in the operation manual.
How is speed calibration verified and maintained?
Speed accuracy is specified as ±20 rpm throughout the range. Regular calibration using a tachometer or strobe light against LCD displays ensures maintained accuracy over time.
What safety features protect against overheating or motor overload?
Specific safety features and protection mechanisms should be detailed in the product documentation. Consult the user manual for complete safety specifications and operating limits.
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