HUXI RWD150 Overhead Digital Stirrer

Overview

The HUXI RWD150 Overhead Digital Stirrer is an engineered solution for precise, reproducible mixing of low- to high-viscosity samples in research laboratories, quality control environments, and pilot-scale production settings. Designed on the principle of overhead mechanical agitation using a vertically aligned drive shaft and interchangeable impellers, the RWD150 delivers consistent shear input and uniform dispersion without introducing air entrapment or thermal drift from motor heat—critical advantages over magnetic stirrers in viscous or temperature-sensitive applications. Its robust architecture supports continuous operation under load, making it suitable for extended batch processing in pharmaceutical formulation development, polymer dissolution studies, emulsion stabilization trials, and catalyst suspension protocols.

Key Features

• Brushless DC motor with thermal and current monitoring—enables stable torque delivery across the full speed range (30–2200 rpm) and ensures >10,000 hours of service life without carbon brush maintenance.
• Dual-mode speed control: coarse adjustment via rotary dial and fine-tuning (±1 rpm resolution) during active operation, supporting real-time optimization of shear rate for non-Newtonian fluids.
• Integrated digital timer (1–9999 min) with LCD display and auto-shutdown function—compliant with GLP documentation requirements when paired with external audit-log software.
• Self-locking chuck with quick-release mechanism and adjustable height-independent mounting—accommodates standard ISO/DIN-compatible stirring rods (6–16 mm diameter) without repositioning the base unit.
• Intelligent torque adaptation: dynamically modulates motor output within the 60 N·cm maximum limit to maintain set speed under varying viscosity loads up to 80,000 mPa·s.
• Comprehensive safety architecture including overcurrent cutoff, short-circuit protection, stall detection, and audible/visual fault alerts—certified to IP42 ingress protection against solid objects ≥1 mm and water splashes.

Sample Compatibility & Compliance

The RWD150 is validated for use with glass, stainless steel, and PTFE-coated vessels ranging from 500 mL beakers to 60 L jacketed reactors. It accommodates common impeller types—including propeller, paddle, anchor, and helical ribbons—enabling optimization for laminar (Re < 2000), transitional, or turbulent flow regimes. The system meets general laboratory safety standards per IEC 61010-1:2010 and is compatible with ISO 17025-accredited workflows when operated within specified environmental conditions (5–40 °C, ≤80% RH). While not intrinsically rated for hazardous area use, optional ATEX-compliant motor variants are available upon request.

Software & Data Management

The RWD150 operates as a standalone instrument with no proprietary software dependency. All operational parameters—including speed setpoint, elapsed time, and fault codes—are retained in non-volatile memory and displayed locally on the backlit LCD. For traceable data capture in regulated environments (e.g., FDA 21 CFR Part 11 or EU Annex 11), users may integrate the device into existing LIMS or ELN platforms via RS-232 or optional USB-to-serial interface (firmware v2.3+), enabling timestamped export of run logs, speed profiles, and error history with user ID tagging.

Applications

• Pharmaceutical: Dissolution testing of sustained-release tablets, suspension homogenization prior to particle size analysis, and buffer blending for bioprocess intermediate storage.
• Chemical R&D: Polymerization reaction mixing, catalyst slurry preparation, and solvent-based resin dispersion under inert atmosphere.
• Food & Cosmetics: Emulsification of oil-in-water systems, thickener hydration (e.g., xanthan gum), and pigment dispersion in aqueous color bases.
• Academic Research: Rheological preconditioning of viscoelastic gels, sedimentation rate studies, and controlled crystallization experiments requiring defined agitation intensity.

FAQ

Is the RWD150 suitable for use in fume hoods or gloveboxes?
Yes—the compact footprint (210 × 290 mm base) and absence of internal cooling fans allow safe integration into ventilated enclosures; ensure ambient humidity remains below 80% RH.
Can the timer be paused and resumed mid-run?
No—the timer functions as a countdown-only controller; interruption requires manual reset. For intermittent agitation protocols, external programmable relays are recommended.
What impeller shaft diameters does the self-locking chuck accept?
Standard compatibility covers 6 mm, 8 mm, 10 mm, and 12 mm round-section shafts; custom adapters for square or D-shaped shafts are available under OEM agreement.
Does the unit support analog speed output for PLC integration?
Not natively—but a 0–10 VDC speed feedback signal can be added via optional analog output module (Order Code: RWD150-AO1), calibrated to ±0.5% FS accuracy.
Is calibration documentation provided with shipment?
A factory calibration certificate (traceable to NIST standards) is included, covering speed accuracy (±1 rpm) and torque linearity (±2% FS) at three points across the operating range.