DLAB OS70-Pro Overhead Electronic Stirrer
| Brand | DLAB |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Domestic (China-made) |
| Model | OS70-Pro |
| Instrument Type | Electric Overhead Stirrer |
| Maximum Stirring Volume | 70 L (water) |
| Speed Range | 50–1100 rpm |
| Speed Control Accuracy | ±10 rpm |
| Torque Range | Up to 300 N·cm |
| Max. Viscosity Handling | 100,000 mPa·s |
| Motor Type | Brushless DC Motor |
| Input Power | 180 W |
| Output Power | 160 W |
| Rated Voltage | 100–240 V, 50/60 Hz |
| Power Consumption | 200 W |
| Timer Range | 0–99 h 59 min |
| Chuck Capacity | 0.5–10 mm |
| Display | LCD (speed setpoint/actual value, torque) |
| Safety Features | Overload, stall, short-circuit, and splash protection with audible/visual alarm |
| Enclosure Rating | IP21 |
| Operating Environment | 5–40 °C, ≤80% RH |
| Data Interface | RS232 |
| Weight | 3.2 kg |
| Dimensions (L×W×H) | 83 × 220 × 186 mm |
| Stirrer Shaft Materials | 316 Stainless Steel or PTFE-Coated Options |
| Auto-Torque Compensation | Yes (maintains set speed across viscosity changes) |
Overview
The DLAB OS70-Pro Overhead Electronic Stirrer is an industrial-grade, brushless DC motor-driven laboratory stirrer engineered for precision mixing and dispersion of medium-to-high viscosity liquids and heterogeneous suspensions. Designed according to the principles of controlled rotational shear transmission, it delivers consistent torque output and stable rotational dynamics under variable load conditions—critical for reproducible chemical synthesis, emulsion preparation, polymer dissolution, and cell culture media homogenization. Unlike magnetic stirrers limited by vessel geometry and heat generation, the OS70-Pro employs a top-mounted drive mechanism with direct mechanical coupling via a self-locking chuck, enabling scalable agitation in open or sealed reactors up to 70 L capacity (water-equivalent). Its robust architecture supports continuous operation over extended durations without thermal derating, making it suitable for GLP-compliant process development and long-term stability studies.
Key Features
- Brushless DC motor delivering 160 W continuous output power, ensuring low electromagnetic interference, zero carbon dust emission, and maintenance-free operation over >20,000 hours MTBF.
- Intelligent torque compensation algorithm maintains user-defined rotational speed within ±10 rpm tolerance—even during sudden viscosity increases (e.g., polymer swelling or crystallization onset).
- Large-format LCD display simultaneously shows real-time speed (setpoint and actual), torque percentage, elapsed time, and system status indicators—including overload warnings and fault codes.
- Self-locking drill chuck accepts shaft diameters from 0.5 to 10 mm without auxiliary tools; integrated silicone protective sleeve prevents solvent-induced corrosion and extends chuck service life.
- Comprehensive safety suite includes electronic overload cutoff, stall detection, short-circuit protection, and anti-splash startup ramping—fully compliant with IEC 61010-1:2010 Edition 3 for laboratory electrical equipment safety.
- RS232 serial interface enables bidirectional communication with host PCs for remote parameter setting, real-time data logging (speed/torque/time), and integration into LIMS or ELN platforms.
- IP21-rated housing provides protection against vertically falling solids and limited ingress of moisture—suitable for standard fume hood and benchtop environments.
Sample Compatibility & Compliance
The OS70-Pro accommodates a wide range of vessel configurations—from narrow-necked round-bottom flasks to wide-mouth bioreactor vessels—thanks to its vertical drive alignment and adjustable support arm. Compatible with both 316 stainless steel and chemically inert PTFE-coated impellers, it meets material compatibility requirements for aggressive solvents (e.g., DMF, THF, concentrated acids/bases) and biological buffers. The device conforms to ISO/IEC 17025:2017 general requirements for calibration laboratories, and its programmable timer (0–99 h 59 min) supports ASTM E2912-20 (Standard Practice for Mechanical Agitation of Liquid Samples) protocols. While not intrinsically rated for Class I Div 1 hazardous locations, its brushless motor and non-sparking chuck assembly meet EN 60079-0 general requirements for surface temperature limitation in non-explosive atmospheres.
Software & Data Management
Via the RS232 port and optional DLAB StirControl™ PC software (Windows-compatible), users can configure multi-step stirring programs—including ramp-up profiles, dwell periods, and torque-triggered event logging. All operational parameters—including timestamped speed, torque, and runtime—are exportable in CSV format for audit trails. The system supports 21 CFR Part 11–compliant workflows when deployed with validated third-party ELN solutions, offering electronic signature capability, audit log integrity, and role-based access control for QA/QC documentation.
Applications
- Chemical R&D: Controlled addition of reagents during exothermic Grignard or lithiation reactions.
- Pharmaceutical manufacturing: Dissolution testing per USP , suspension homogenization for oral liquid dosage forms.
- Food & cosmetics: Emulsification of oil-in-water systems (e.g., mayonnaise, lotions) with shear-sensitive ingredients.
- Materials science: Dispersion of nanomaterials (graphene oxide, TiO₂) in polymer matrices under inert atmosphere.
- Biotechnology: Gentle agitation of mammalian cell cultures in serum-free media to prevent shear-induced apoptosis.
FAQ
What is the maximum recommended viscosity for sustained operation?
The OS70-Pro is rated for continuous use up to 100,000 mPa·s at 25 °C using appropriate impeller geometry (e.g., anchor or helical ribbon); performance beyond this threshold depends on thermal management and impeller design.
Does the unit support external trigger inputs or analog signal outputs?
No—only RS232 serial communication is provided; no 0–10 V or 4–20 mA I/O is available on this model.
Is firmware upgrade capability included?
Yes—field-upgradable firmware is supported via RS232 and DLAB’s official utility; version history and release notes are published on the manufacturer’s global technical support portal.
Can the timer function be used independently of speed control?
Yes—the timer operates autonomously and can initiate, pause, or terminate stirring sequences regardless of manual or programmed speed settings.
What regulatory documentation is supplied with the instrument?
Each unit ships with CE Declaration of Conformity (2014/30/EU EMC Directive & 2014/35/EU LVD), RoHS 2011/65/EU compliance statement, and full test report per IEC 61010-1.
