HePu A400plus Intelligent Touch-Control Laboratory Stirrer

Overview

The HePu A400plus Intelligent Touch-Control Laboratory Stirrer is an electronically regulated, high-torque benchtop mixing system engineered for reproducible agitation across a broad spectrum of laboratory-scale liquid-phase processes. Based on closed-loop brushless DC motor architecture and real-time torque feedback control, the A400plus delivers stable rotational output under variable load conditions—critical for applications involving non-Newtonian fluids, shear-thinning suspensions, or high-viscosity formulations. Its operational envelope spans from gentle homogenization of cell cultures (at low rpm with precise acceleration ramping) to vigorous dispersion of nanoparticle slurries or polymer melts (up to 100,000 cP). Designed for integration into regulated environments, the unit supports traceable operation through timestamped parameter logging and conforms to fundamental electrical safety and electromagnetic compatibility expectations aligned with IEC 61000-6-3 and IEC 61000-6-2 standards.

Key Features

• 400 W brushless DC motor with dynamic torque compensation—maintains set speed within ±1% deviation across viscosity shifts up to 100,000 cP
• Full-touch capacitive interface with intuitive icon-driven navigation and haptic response confirmation
• Backlit 4.3-inch LCD display showing simultaneous real-time values: actual/set speed (rpm), torque (N·cm), elapsed time, remaining timer, and acceleration profile status
• Programmable soft-start function with adjustable ramp rate (0.1–5.0 s/100 rpm) to minimize vortex formation and sample splashing
• Integrated thermal cutoff and electronic overload protection—automatically halts operation if motor temperature exceeds 85 °C or current draw exceeds rated threshold
• SUS316L wetted components including chuck, shaft collar, and impeller hub—ensuring corrosion resistance in acidic, alkaline, and saline media
• Modular mechanical design: standard single vertical stand with M12 threading; optional dual-rod configuration available for enhanced stability with tall vessels or asymmetric loads

Sample Compatibility & Compliance

The A400plus accommodates vessels from 50 mL beakers to 100 L jacketed reactors (with appropriate support rigging), supporting both batch and semi-continuous mixing protocols. It is routinely deployed in R&D labs handling biopharmaceutical buffers, pesticide emulsions, conductive ink dispersions, and water-based adhesives—where consistent shear history directly impacts colloidal stability and phase uniformity. While not certified to ISO 17025 or FDA 21 CFR Part 11 out-of-the-box, its digital parameter logging (via optional USB-to-PC connection) enables audit-ready data capture when paired with validated third-party software. The unit’s construction and labeling follow general principles referenced in ISO 13850 (emergency stop) and IEC 61010-1 (safety requirements for lab equipment), making it suitable for use in GMP-aligned pilot-scale development workflows where operator safety and process repeatability are primary concerns.

Software & Data Management

The A400plus supports optional PC connectivity via USB 2.0 for extended data acquisition and remote operation. When interfaced with HePu’s proprietary LabStir Control Suite (v3.2+), users can export CSV-formatted logs containing time-stamped records of speed, torque, temperature (when external probe integrated), and timer status—each entry stamped with system-generated UTC timestamps and user ID fields. The software enforces role-based access control, supports electronic signature capture for critical parameter changes, and generates PDF reports compliant with ALCOA+ data integrity principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available). Audit trails are immutable and stored separately from operational memory—meeting foundational expectations for GLP-compliant documentation.

Applications

• Biopharmaceutical: Buffer preparation, solubilization of lyophilized proteins, and low-shear mixing of monoclonal antibody formulations
• Materials Science: Dispersion of carbon nanotubes in epoxy resins, stabilization of quantum dot suspensions, and rheological conditioning of ceramic slurries
• Agrochemical Development: Emulsification of active ingredients in oil-in-water carriers, suspension concentration homogenization, and wettable powder reconstitution studies
• Food & Beverage R&D: Hydration of hydrocolloids (e.g., xanthan, guar gum), dairy protein dispersion, and flavor oil incorporation into aqueous bases
• Environmental Testing: Preparation of standardized sediment slurries for toxicity assays, and homogenization of wastewater influent samples prior to COD/BOD analysis

FAQ

Is the A400plus compatible with glass reactor jackets or heating mantles?
Yes—the unit’s mechanical design allows unobstructed mounting above standard 50–100 L jacketed reactors; however, temperature control must be managed externally via circulator or mantle controller, as the stirrer itself does not provide heating or cooling.

Can the torque readout be calibrated in-house?
No—torque calibration is performed at factory using traceable load cells per ISO/IEC 17025-accredited procedures; field recalibration requires return to authorized service center.

What is the maximum recommended vessel height for stable operation with the standard single-stand configuration?
For optimal lateral stability and minimal vibration, vessel height should not exceed 650 mm when using the standard single vertical stand; dual-stand mounting is advised for vessels taller than 700 mm or with aspect ratios >3:1.

Does the USB interface support direct data streaming to LIMS platforms?
The native USB port outputs raw ASCII telemetry; integration with LIMS requires middleware translation (e.g., OPC UA gateway or custom Python script using PySerial), which is documented in the Application Integration Manual (Ref. HEPU-A400PLUS-LIMS-IM-2024).

Are explosion-proof variants available for solvent-based chemistry applications?
Not currently—standard A400plus units are rated for general laboratory use only (non-hazardous location); ATEX or IECEx-certified versions are under development and scheduled for release Q2 2025.