LED Overhead Stirrer (OS40-S)

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The LED Overhead Stirrer is a high-capacity LED digital overhead mechanical stirrer featuring a brushless DC motor (120W input / 100W output), microprocessor-controlled speed regulation (50-2200 rpm, accuracy ±3 rpm), LED display for real-time speed monitoring, enhanced torque (60 N·cm), and increased viscosity handling (up to 50,000 mPa·s), designed for demanding high-viscosity and large-volume (up to 40 liters) mixing, homogenizing, and suspending applications in clinical diagnostic, pharmaceutical, and research laboratories .
Key features include a maintenance-free, explosion-proof brushless DC motor for quiet, long-lasting operation and safe use in volatile environments; through-shaft design for easy impeller height adjustment; anti-spill slow-start mechanism to prevent sample splashing; overload protection (LED indicator lights, motor automatic stop in case of continuous overload) for equipment and sample safety; and compatibility with a wide range of stirrer shafts (0.5-10 mm chuck diameter) .
The  LED Overhead Stirrer represents a significant upgrade from the LED Overhead Stirrer, with double the stirring capacity (40L vs 20L), double the output power (100W vs 50W), 50% higher torque (60 N·cm vs 40 N·cm), and five times higher viscosity handling (50,000 mPa·s vs 10,000 mPa·s), making it suitable for the most demanding high-viscosity applications .
For the pharmaceutical formulation scientist and quality control chemist, the  LED Overhead Stirrer supports mixing of high-viscosity creams, ointments, gels, and suspensions at batch sizes up to 40L, API dissolution testing, and large-volume buffer and media preparation . For the biopharmaceutical manufacturing scientist, it enables processing of cell pastes, protein solutions, and fermentation broths with viscosity up to 50,000 mPa·s . For the clinical laboratory scientist, it facilitates bulk reagent preparation for high-volume immunoassays and clinical chemistry analyzers .
Universal voltage (100-240V, 50/60Hz) enables use in laboratories worldwide without voltage conversion, while the compact (83 × 220 × 186 mm) and lightweight (2.8 kg) design allows easy benchtop placement . The IP42-rated splash-resistant housing ensures safe operation in biosafety cabinets and fume hoods, including handling of biohazardous materials .
For the patient undergoing pharmaceutical therapy, the  LED Overhead Stirrer enhanced torque and viscosity handling ensure consistent formulation quality, batch-to-batch uniformity, and accurate API release testing—supporting the manufacturing of safe, effective high-viscosity medications such as topical creams, ointments, and biopharmaceuticals . For patients requiring diagnostic testing, consistent large-volume reagent preparation reduces inter-run variability and improves the reliability of diagnostic test results across high-volume clinical chemistry, pharmaceutical QC, and analytical testing applications .
Description

LED Overhead Stirrer

PRIMARY CLINICAL & DIAGNOSTIC USES

1. High-Volume Pharmaceutical Formulation Development
  • Primary Use: Provides a high-capacity LED digital overhead stirrer with brushless DC motor (120W input / 100W output), speed range 50-2200 rpm, and maximum viscosity handling of 50,000 mPa·s, designed for demanding mixing of high-viscosity pharmaceutical formulations at large batch sizes up to 40 liters .
  • How it helps: For the pharmaceutical formulation scientist and quality control chemist, the LED Overhead Stirrer increased power output (100W vs 50W on  LED Overhead Stirrer) and higher torque (60 N·cm) enable efficient mixing of high-viscosity pharmaceutical formulations such as creams, ointments, gels, and suspensions at larger batch sizes (up to 40L) . The LED display provides real-time monitoring of actual speed for precise control . For the patient, consistent high-volume formulation ensures that medications deliver the correct dosage and therapeutic effect with each use, particularly for high-viscosity topical preparations.
2. Large-Volume Clinical Reagent and Buffer Preparation
  • Primary Use: Capable of stirring volumes up to 40 liters (water) with maximum torque of 60 N·cm, enabling large-batch preparation of reagents, buffers, and clinical samples for high-throughput diagnostic testing workflows .
  • How it helps: For the clinical laboratory scientist and laboratory manager in high-volume reference laboratories, the LED Overhead Stirrer increased capacity (40L vs 20L on  LED Overhead Stirrer) allows efficient preparation of bulk reagents for immunoassays, clinical chemistry analyzers, and molecular diagnostics—significantly reducing hands-on time and ensuring batch consistency across hundreds or thousands of patient samples . For the patient, consistent reagent preparation across large batches reduces inter-run variability and improves the reliability of diagnostic test results .
3. High-Viscosity Sample Processing for Biopharmaceutical Manufacturing
  • Primary Use: Capable of handling samples with viscosity up to 50,000 mPa·s, enabling homogenization and emulsification of highly viscous biological fluids, cell pastes, and biopharmaceutical formulations for quality control and manufacturing support .
  • How it helps: For the biopharmaceutical manufacturing scientist and quality control chemist, the OS40-S’s increased viscosity handling (50,000 mPa·s vs 10,000 mPa·s on OS20-S) ensures efficient processing of high-viscosity cell pastes, protein solutions, and fermentation broths—critical for downstream purification and formulation . For the patient, consistent high-viscosity sample processing ensures that biopharmaceutical products (monoclonal antibodies, vaccines, cell therapies) meet quality standards for safety and efficacy .
4. Safe Handling of High-Viscosity Biohazardous Materials
  • Primary Use: Features IP42 protection rating, splash-resistant design, overload protection with LED indicator and automatic motor stop, and anti-spill slow-start mechanism (PC control system smooth start-up), enabling safe handling of high-viscosity biohazardous materials in biosafety cabinets and fume hoods .
  • How it helps: For the clinical laboratory scientist and biosafety officer, the LED Overhead Stirrer splash-resistant housing protects against accidental spills of infectious materials, while overload protection (LED indicator lights, motor automatically stops in case of continuous overload) prevents motor damage and sample loss during high-viscosity mixing . The anti-spill slow-start mechanism gradually increases speed to prevent splashing . For the patient, safe handling of biohazardous materials in clinical and research laboratories reduces the risk of laboratory-acquired infections and ensures sample integrity .
5. High-Volume Buffer Preparation for Clinical Analyzers
  • Primary Use: Supports preparation of large volumes (up to 40L) of wash buffers, reagent solutions, and calibrators for automated clinical chemistry and immunoassay analyzers in high-throughput clinical laboratories .
  • How it helps: For the clinical laboratory scientist and automation specialist, the  LED Overhead Stirrer large capacity and consistent mixing performance ensure that bulk reagents for automated analyzers are prepared with batch-to-batch uniformity—reducing re-calibration needs and improving analyzer uptime . For the patient, consistent reagent quality across large batches improves the reliability of routine diagnostic testing, from complete blood counts to cardiac enzyme panels .

SECONDARY & SUPPORTIVE USES

1. Chemical Synthesis and Reaction Mixing: Used for stirring chemical reactions in organic synthesis, polymerization, and drug discovery workflows requiring high torque and large volumes .
2. API Dissolution Testing: Supports stirring of dissolution media for active pharmaceutical ingredient (API) release testing in pharmaceutical quality control laboratories .
3. Cosmetic and Personal Care Product Formulation: Used for mixing creams, lotions, gels, and emulsions in cosmetic product development and quality control at batch sizes up to 40L .
4. Food and Beverage Product Testing: Supports sample homogenization and ingredient mixing for food safety testing and nutritional analysis of high-viscosity products .
5. Paints, Coatings, and Inks Quality Control: Used for mixing and dispersion of pigments, resins, and additives in paint, coating, and ink manufacturing .
6. Petroleum and Petrochemical Sample Preparation: Supports mixing of oil, fuel, and lubricant samples for viscosity testing and quality analysis .
7. Biopharmaceutical Buffer and Media Preparation: Used for large-volume preparation of cell culture media, buffers, and purification solutions in biopharmaceutical manufacturing up to 40L batches .
8. Environmental Sample Processing: Supports mixing of water, soil, and wastewater samples for pollutant analysis and environmental monitoring .
9. Polymer and Plastics Testing: Used for mixing polymer solutions, resins, and plastic additives for materials testing and quality control .
10. Adhesives and Sealants Formulation: Supports mixing of adhesives, epoxies, and sealants for product development and quality testing .
11. Pilot-Scale Production and Scale-Up: Used for small-batch production and scale-up studies in pharmaceutical, chemical, and food manufacturing pilot plants up to 40L .
12. Debubbling and Degassing of Viscous Liquids: Supports gentle stirring to remove air bubbles from viscous solutions and gels .
13. Quality Control Testing of Raw Materials: Used for mixing of incoming raw material samples for identity, purity, and quality testing of high-viscosity materials .
14. Research and Academic Laboratories: Provides reliable overhead stirring for diverse research applications in chemistry, biology, and materials science requiring high torque .
15. Veterinary Pharmaceutical Formulation: Supports mixing of veterinary drug formulations and medicated feeds for animal health testing .
16. Infection Control Disinfectant Production: Used for mixing bulk disinfectant solutions for healthcare facility infection control programs .
Healthcare Product Development: Supports stirring in R&D of new pharmaceutical treatments, vaccines, and healthcare products at pilot scale .
17. Solubility Testing for Drug Development: Supports dissolution and mixing in drug solubility studies for new pharmaceutical compounds requiring high shear .
18. Formulation Stability Testing: Used for mixing stability samples in pharmaceutical QC laboratories for shelf-life determination of high-viscosity products .
19. Pilot Bioprocessing: Supports mixing of fermentation broths and cell culture harvests in pilot-scale bioprocessing workflows .
KEY PRODUCT FEATURES

1. BASIC IDENTIFICATION ATTRIBUTES

  • Device Type: A high-capacity LED digital overhead stirrer (overhead mechanical stirrer) with brushless DC motor, microprocessor control, and enhanced torque (60 N·cm) and viscosity (50,000 mPa·s) handling, designed for demanding high-viscosity and large-volume (up to 40L) mixing, homogenizing, and suspending applications in clinical diagnostic, pharmaceutical, and research laboratories .
  • Designation:  LED Overhead Stirrer, LED Digital Overhead Stirrer, High-Torque Overhead Stirrer, Laboratory Stirrer, DLAB  LED Overhead Stirrer, Digital Electric Overhead Stirrer .
  • Key Components:
o Motor: Brushless DC motor (maintenance-free, explosion-proof, low noise) .
o Motor Power: 120W input / 100W output .
o Speed Control: Microprocessor-controlled, 50-2200 rpm, accuracy ±3 rpm .
o Display: LED digital display (actual speed monitoring) .
o Chuck: 0.5-10 mm chuck diameter for various stirrer shafts .
o Through-Shaft Design: Allows easy adjustment of impeller position .
o Safety Features: Overload protection (LED indicator lights, motor automatic stop), anti-spill slow-start mechanism, IP42 protection rating .

2. TECHNICAL & PERFORMANCE PROPERTIES

  • Maximum Stirring Capacity: 40 liters (H₂O) .
  • Maximum Viscosity: 50,000 mPa·s .
  • Maximum Torque: 60 N·cm .
  • Speed Range: 50 – 2,200 rpm .
  • Speed Display Resolution: ±1 rpm .
  • Speed Control Accuracy: ±3 rpm .
  • Motor Type: Brushless DC motor (maintenance-free, low noise, explosion-proof) .
  • Motor Input Power: 120W .
  • Motor Output Power: 100W .
  • Total Power Consumption: 130W .
  • Chuck Diameter Range: 0.5 – 10 mm .
  • Voltage/Frequency: 100-240V, 50/60Hz (universal voltage) .
  • Dimensions (W × D × H): 83 × 220 × 186 mm .
  • Weight: 2.8 kg .
  • Protection Class: IP42 (splash-resistant, protection against solid objects >1mm) .
  • Operating Temperature: 5-40°C .
  • Permissible Ambient Humidity: ≤80% RH .
  • Overload Protection: LED lights, motor automatically stops in case of continuous overload .
  • Motor Protect: LED lights, motor automatically stops .
  • Stirrer Shaft Compatibility: Through-shaft design accepts various stirrer shafts .
  • Accessories (Sold Separately): Universal plate stand (base + rod + clamp), various stirrer impellers (propeller, anchor, flat blade, PTFE-coated, 316L stainless steel) .

3. PHYSICAL & OPERATIONAL PROPERTIES

  • Construction: Compact benchtop design with durable housing and through-shaft chuck for easy impeller height adjustment .
  • Display: LED digital display shows actual speed in real-time; overload protection LED indicator lights .
  • Control: Microprocessor-controlled with smooth acceleration; anti-spill slow-start mechanism prevents sample splashing; start/stop push-button; speed adjustment via rotary knob with positive stop .
  • Operation Modes: Continuous operation (manual control) .
  • Motor Type: Brushless DC motor provides low noise, maintenance-free, explosion-proof operation, long life, and high reliability .
  • Chuck: High-capacity chuck (0.5-10 mm) accepts various stirrer shaft diameters; through-shaft design allows vertical positioning adjustment; self-locking chuck for quick shaft attachment .
  • Portability: Compact footprint (83 × 220 × 186 mm) and moderate weight (2.8 kg) for easy benchtop placement .
  • Maintenance: Brushless DC motor requires no routine maintenance; chuck and shaft should be cleaned after each use .

4. SAFETY & COMPLIANCE ATTRIBUTES

  • Regulatory Status: General laboratory equipment for in vitro diagnostic use; meets applicable laboratory safety standards .
  • Safety Features: Overload protection (LED indicator lights, motor automatically stops in case of continuous overload), anti-spill slow-start mechanism (microprocessor-controlled smooth acceleration), IP42 splash-resistant housing, automatic motor stop in case of anti-stall or overload condition .
  • Electrical Safety: Universal voltage (100-240V, 50/60Hz) for international use; 130W power consumption; earthed power connection recommended .
  • Motor Type: Brushless DC motor provides maintenance-free, quiet, stable operation with long service life and explosion-proof design .
  • Operating Conditions: 5-40°C ambient temperature; ≤80% relative humidity; IP42-rated for splash protection .
  • Standard Accessory: Propeller stirrer (18900071) included .

5. STORAGE & HANDLING ATTRIBUTES

  • Storage: Store on clean, dry benchtop; protect from dust and moisture; store stirrer shafts separately when not in use .
  • Cleaning: Wipe drive unit housing with soft, damp cloth using neutral detergent; 70% ethanol solution may be used for surface disinfection; clean chuck and shaft after each use; do not immerse drive unit in liquid; disconnect power before cleaning .
  • Inspection: Inspect power cord for damage before each use; check chuck for wear or debris; verify shaft is securely tightened before operation; inspect stand stability before mounting .
  • Operation: Mount drive unit on appropriate stand (sold separately); select appropriate stirrer shaft for sample viscosity and volume; attach shaft to chuck and tighten securely; immerse impeller into sample (ensure proper depth); set speed using rotary knob; start motor via push-button; monitor LED display for actual speed and overload indicator .
  • Speed Selection: Use lower speeds (50-500 rpm) for gentle mixing, delicate samples, and high-viscosity materials; use medium speeds (500-1200 rpm) for general mixing and suspensions; use higher speeds (1200-2200 rpm) for high shear and emulsification .
  • Shaft Selection: Use propeller-style impellers for general mixing and fluid circulation; use anchor-style impellers for high-viscosity samples; use flat-blade impellers for shear-sensitive applications; use PTFE-coated impellers for corrosive samples; straight propeller, cross blades, paddle, centrifuge style, stainless steel, and PTFE options available .
  • Stand Use: Ensure stand is properly assembled on stable benchtop; verify clamp is securely tightened; ensure drive unit is level and stable before operation .
  • Spill Management: If liquid spills onto drive unit, disconnect power immediately, clean thoroughly with appropriate disinfectant, allow to dry before reuse; IP42 rating provides splash protection but unit should not be submerged .

6. LABORATORY & CLINICAL APPLICATIONS

  • Primary Application: High-torque, high-viscosity (up to 50,000 mPa·s) and large-volume (up to 40L) mixing, homogenizing, suspending, and emulsifying of pharmaceutical formulations, clinical samples, chemical reactions, and quality control samples in high-demand clinical diagnostic, pharmaceutical, and research laboratories .
  • Clinical Role: Essential high-performance mixing equipment in pharmaceutical QC laboratories, clinical chemistry laboratories, biopharmaceutical manufacturing, analytical chemistry labs, and research facilities requiring high-torque or high-viscosity sample preparation .
SAFETY HANDLING PRECAUTIONS

1. SAFETY PRECAUTIONS

  • Electrical Safety: Disconnect power before cleaning or changing shafts; do not immerse drive unit in liquid; keep power cord away from heat sources and sharp edges; use only properly grounded electrical outlets .
  • Stand Stability: Ensure stand is placed on stable, level surface; verify that clamp is securely tightened; ensure drive unit is properly mounted before operation .
  • Shaft Security: Ensure stirrer shaft is fully inserted and securely tightened in chuck before starting motor; loose shafts may detach during operation and cause injury or sample loss; self-locking chuck provides quick, secure attachment .
  • Sample Container: Use appropriate container (beaker, vessel) with sufficient diameter and depth for impeller; clamp container to stand to prevent spinning or tipping; ensure container can withstand torque of high-viscosity mixing .
  • Operating Precautions: Never operate stirrer with impeller out of liquid; this may damage the motor and sample. Ensure impeller is fully immersed (but not touching container bottom) before starting motor. Do not operate above rated viscosity (50,000 mPa·s) or above rated torque (60 N·cm) .
  • Personal Protective Equipment: Wear appropriate PPE—laboratory coat, safety glasses/face shield, gloves—when operating stirrer; use chemical-resistant gloves when handling corrosive or hazardous materials .
  • Noise Exposure: At ≤70 dB, noise level is below occupational exposure limits; no hearing protection required .
  • Cleaning: Clean spills immediately; disinfect chuck and shaft if biological materials are involved; allow to dry before storage .
  • Overload Response: If overload protection activates (LED indicator lights, motor automatically stops), disconnect power, reduce sample viscosity or volume, or use larger impeller; allow unit to cool before restarting; contact service if issue persists .
  • Training: Only trained laboratory personnel should operate the  LED Overhead Stirrer for clinical diagnostic applications .

2. FIRST AID MEASURES

  • Sample Splash: If biological or chemical sample splashes into eyes, flush with water for 15 minutes, seek medical attention; if on skin, wash with soap and water .
  • Electrical Malfunction: If unit shows signs of electrical malfunction (smoke, burning smell), disconnect power immediately; do not attempt to operate; contact service personnel .
  • Mechanical Failure: If unit fails to operate, makes abnormal noise, or vibrates excessively, disconnect power, check shaft for balance or damage, contact service if issue persists .
  • Overload Shutdown: If unit stops due to overload, reduce sample viscosity or volume, or use larger impeller; restart after motor cools; contact service if issue persists .
  • Chemical Spill: If corrosive chemicals spill on unit, disconnect power immediately, wipe with appropriate neutralizer, dry thoroughly before reconnecting power .

3. FIRE FIGHTING MEASURES

  • Flammability: Plastic housing and electrical components may burn; brushless DC motor does not produce sparks like carbon brush motors .
  • Extinguishing Media: Use carbon dioxide (CO₂) or dry chemical extinguisher for electrical fires .
  • Fire Response: Unplug unit immediately; do not use water on electrical fire .