HsiangTai BLG-2D Digital Brushless DC Magnetic Stirrer with Torque Compensation

Overview

The HsiangTai BLG-2D is a precision-engineered digital brushless DC magnetic stirrer designed for consistent, high-reproducibility mixing in analytical laboratories, quality control environments, and R&D settings. Unlike conventional AC-motor-driven stirrers, the BLG-2D employs a maintenance-free brushless DC motor that delivers smooth torque delivery across its full 0–1500 rpm operating range, minimizing mechanical wear and electromagnetic interference. Its core operational principle relies on magnetic coupling between the rotating drive magnet beneath the work surface and the stirring bar immersed in the sample—enabling contactless agitation ideal for sealed or sterile vessels. The unit integrates real-time torque compensation logic: when viscosity changes occur during mixing (e.g., polymer dissolution or temperature-induced rheological shifts), the controller dynamically adjusts current to maintain set speed, ensuring process stability without manual intervention. This closed-loop speed regulation meets fundamental requirements for method transferability under GLP and ISO/IEC 17025-compliant workflows.

Key Features

• Brushless DC motor with extended service life (>10,000 hours MTBF) and low acoustic emission (<45 dB at 1 m)
• Dual-mode torque indication: five-step LED bar graph (20%, 40%, 60%, 80%, 100%) plus numeric torque readout in kgf·cm
• Digital RPM display with ±1 rpm resolution and programmable timer (0–99 h 59 min) supporting delayed start and auto-shutdown
• Stainless steel chuck with integrated clamping mechanism; hollow shaft design allows vertical adjustment of stir bar depth (±50 mm travel)
• Integrated safety architecture: thermal cutoff at 85°C, electronic overload detection, and replaceable 2 A slow-blow fuse
• Universal power compatibility: auto-switching input (110/220 V AC, 50/60 Hz) suitable for global laboratory deployment
• Optional spring-loaded vertical lift module (sold separately) enables hands-free height adjustment for multi-vessel protocols

Sample Compatibility & Compliance

The BLG-2D accommodates standard laboratory glassware including beakers (up to 10 L capacity), Erlenmeyer flasks, and jacketed reactors with flat-bottom configurations. It supports PTFE- and ceramic-coated stir bars up to Ø8 mm × 500 mm and accommodates impeller-type blades (e.g., No. 8, Ø50 mm). The device complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets EMC requirements per CISPR 11 Class B. While not certified for hazardous area use (ATEX/IECEx), it is routinely deployed in non-explosive ambient conditions meeting ISO 14644-1 Class 8 cleanroom specifications. Its digital timer and torque logging capability support traceability requirements aligned with FDA 21 CFR Part 11 Annex 11 principles when integrated into validated SOPs.

Software & Data Management

The BLG-2D operates as a standalone instrument with no proprietary software dependency. All operational parameters—including speed setpoint, torque output, elapsed time, and safety event flags—are retained in non-volatile memory and accessible via front-panel interface. For integration into centralized lab management systems, optional RS-232 or USB-to-serial adapters enable ASCII command protocol communication (e.g., “SPEED=1200”, “TORQUE?”, “TIMER=02:30:00”). Audit trail functionality is implemented via hardware timestamping of critical events (e.g., overtemperature shutdown, fuse blow), recorded with millisecond precision and retrievable via serial dump. These features facilitate compliance with GLP documentation standards and internal QA record retention policies.

Applications

• Homogenization of aqueous and organic-phase solutions prior to HPLC or GC sample injection
• Controlled dissolution testing of pharmaceutical tablets per USP guidelines
• Preparation of calibration standards requiring uniform particle suspension (e.g., turbidity standards, nanoparticle dispersions)
• Buffer equilibration in chromatography system priming protocols
• Long-duration enzymatic reaction monitoring where stable shear input is critical to kinetic reproducibility
• Supporting ASTM D2196 viscosity measurement procedures using rotational viscometers with external bath coupling

FAQ

Does the BLG-2D support external temperature feedback for coupled heating-stirring applications?
No—the BLG-2D is a dedicated stirrer without integrated heating or temperature sensor inputs. It may be used alongside external hotplates or circulators, but no closed-loop thermal control is provided.
What is the maximum permissible load inertia for stable operation?
The motor is rated for inertial loads ≤0.0015 kg·m² when operating above 800 rpm; heavier stir bars or large-diameter impellers require verification against torque curve data in the technical manual.
Is firmware upgrade capability available?
Firmware is factory-programmed and not field-upgradable; however, all units ship with revision-locked binaries compliant with IEC 62304 Class B medical software standards.
Can the timer function be disabled for continuous operation?
Yes—setting the timer to “00:00:00” disables automatic shutdown, allowing uninterrupted operation until manually powered off or interrupted by a safety event.
Are CE or UKCA markings present on the unit?
The BLG-2D carries CE marking per Directive 2014/30/EU (EMC) and 2014/35/EU (LVD); UKCA marking is not applied, as the device falls outside GB-specific conformity assessment scope for standalone lab stirrers.