Pro Overhead stirrer (OS40)

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The Pro Overhead Stirrer is a high-performance digital overhead mechanical stirrer featuring a brushless DC motor (120W input / 100W output), microprocessor-controlled speed regulation (50-2200 rpm, accuracy ±3 rpm), LCD display for real-time monitoring of set speed, actual speed, and torque trend, RS232 interface for PC control and data logging, 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 (LCD visual alarm, automatic motor stop) for equipment and sample safety; torque display for real-time viscosity monitoring; and compatibility with a wide range of stirrer shafts (0.5-10 mm chuck diameter) .
The Pro Overhead stirrer represents a significant upgrade from the Pro 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 Pro 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 IP21-rated splash-resistant housing ensures safe operation in biosafety cabinets and fume hoods, including handling of biohazardous materials . RS232 connectivity allows integration into automated workflows and LIMS for GLP/GMP documentation .
For the patient undergoing pharmaceutical therapy, the Pro 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

Pro Overhead stirrer

PRIMARY CLINICAL & DIAGNOSTIC USES

1. High-Throughput Pharmaceutical Formulation Development
  • Primary Use: Provides a high-performance digital overhead stirrer with LCD display, 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, homogenizing, and suspending applications requiring high torque and large volume capacity .
  • How it helps: For the pharmaceutical formulation scientist and quality control chemist, the Pro Overhead stirrer increased power output (100W vs 50W on Pro 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 LCD display provides real-time monitoring of both set speed and actual speed, as well as torque trending for viscosity changes . 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 Pro Overhead stirrer increased capacity (40L vs 20L on Pro 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-Pro’s increased viscosity handling (50,000 mPa·s vs 10,000 mPa·s on Pro Overhead stirrer) and automatic torque adjustment ensure 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. PC Control and Data Logging for GLP/GMP Compliance
  • Primary Use: Features RS232 interface for PC control, enabling remote operation, data logging, and real-time monitoring of speed and torque for titration, reaction monitoring, and documentation of stirring parameters to support regulatory compliance .
  • How it helps: For the quality assurance manager and regulatory compliance officer, the Pro Overhead stirrer RS232 connectivity allows connection to laboratory information management systems (LIMS) for traceable documentation of stirring speed, torque, and duration for each batch or sample—supporting regulatory compliance with GLP, GMP, and ISO standards . For the patient, compliant manufacturing and testing processes ensure that pharmaceutical products and diagnostic assays meet regulatory requirements for safety and efficacy .
5. Safe Handling of High-Viscosity Biohazardous Materials
  • Primary Use: Features IP21 protection rating, splash-resistant design, overload protection with automatic motor stop (visual alarm display on LCD), and anti-spill slow-start mechanism, 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 Pro Overhead stirrers plash-resistant housing protects against accidental spills of infectious materials, while overload protection (visual alarm and automatic motor stop) 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 .

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 .
17. Healthcare Product Development: Supports stirring in R&D of new pharmaceutical treatments, vaccines, and healthcare products at pilot scale .
18. High-Volume Buffer Preparation for Clinical Analyzers: Used for preparing large volumes (up to 40L) of wash buffers, reagent solutions, and calibrators for automated clinical chemistry and immunoassay analyzers .
19. Solubility Testing for Drug Development: Supports dissolution and mixing in drug solubility studies for new pharmaceutical compounds requiring high shear .
20. Formulation Stability Testing: Used for mixing stability samples in pharmaceutical QC laboratories for shelf-life determination of high-viscosity products .
KEY PRODUCT FEATURES

1. BASIC IDENTIFICATION ATTRIBUTES

  • Device Type: A high-performance digital overhead stirrer with LCD display, brushless DC motor, microprocessor control, RS232 interface, and enhanced torque (60 N·cm) and viscosity (50,000 mPa·s) handling, designed for demanding high-viscosity and large-volume mixing, homogenizing, and suspending applications in clinical diagnostic, pharmaceutical, and research laboratories .
  • Designation: Pro Overhead Stirrer, LCD Digital Overhead Stirrer, High-Torque Overhead Stirrer, Laboratory Stirrer, DLAB Pro 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: LCD digital display (set speed, actual speed, torque, overload protection) .
o Torque Display: LCD real-time torque display for viscosity monitoring .
o Chuck: 0.5-10 mm chuck diameter for various stirrer shafts .
o Through-Shaft Design: Allows easy adjustment of impeller position .
o Interface: RS232 for PC control and data logging .
o Safety Features: Overload protection (visual alarm, automatic motor stop), anti-spill slow-start mechanism, IP21 protection rating, over-temperature protection .

2. TECHNICAL & PERFORMANCE PROPERTIES

  • Maximum Stirring Capacity: 40 liters (H₂O) .
  • Maximum Viscosity: 50,000 mPa·s .
  • Maximum Torque: 60 N·cm .
  • Speed Range: 50 – 2200 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 (instrument only) .
  • Protection Class: IP21 (splash-resistant, protection against solid objects >12mm) .
  • Operating Temperature: 5-40°C .
  • Permissible Ambient Humidity: ≤80% RH .
  • Interface: RS232 (PC control, data logging) .
  • Stirrer Shaft Compatibility: Through-shaft design accepts various stirrer shafts .
  • Overload Protection: Visual alarm on LCD display, motor automatic stop .
  • Torque Display: LCD real-time torque trend display .
  • 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: Large LCD digital display shows set speed, actual speed, torque trend, and overload protection status; torque display for real-time viscosity monitoring .
  • Control: Microprocessor-controlled with smooth acceleration; anti-spill slow-start mechanism prevents sample splashing; start/stop button; speed adjustment via rotary knob .
  • Operation Modes: Continuous operation (manual control) or PC-controlled (via RS232) for automated workflows .
  • 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 (visual alarm on LCD display, automatic motor stop), anti-spill slow-start mechanism (microprocessor-controlled smooth acceleration), IP21 splash-resistant housing, automatic motor stop in case of anti-stall or overload condition, safety circuit with automatic power-off in abnormal conditions .
  • 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 .
  • GLP Compliance: RS232 interface allows data logging for GLP documentation; LCD torque display supports viscosity monitoring for reproducible methods .
  • Operating Conditions: 5-40°C ambient temperature; ≤80% relative humidity; IP21-rated for splash protection .

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 LCD display for actual speed, torque trend, 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 .
  • RS232 Connection: Connect to PC via RS232 interface for data logging, remote control, and documentation of stirring parameters; compatible with laboratory information management systems (LIMS) for GLP/GMP compliance .
  • Spill Management: If liquid spills onto drive unit, disconnect power immediately, clean thoroughly with appropriate disinfectant, allow to dry before reuse; IP21 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 (LCD visual alarm, 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 .
  • Torque Monitoring: Monitor LCD torque display during operation; increasing torque indicates increasing viscosity; decreasing torque may indicate sample thinning or impeller cavitation .
  • Training: Only trained laboratory personnel should operate the  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 .