HUXI HMS-40 High-Capacity Magnetic Stirrer

Overview

The HUXI HMS-40 High-Capacity Magnetic Stirrer is an industrial-grade, non-heated laboratory stirring system engineered for reproducible, low-shear mixing of large-volume liquid samples in research, quality control, and process development environments. Unlike conventional hotplate stirrers, the HMS-40 employs a permanent-magnet coupling principle—where a rotating external magnet array induces synchronous rotation of a magnetic stir bar immersed in the sample vessel—enabling contactless torque transmission without mechanical seals or shaft penetration. This design eliminates contamination risk, supports sterile or sealed-vessel operation, and ensures long-term reliability under continuous duty cycles. Its 40 L maximum stirring capacity makes it suitable for preparative chemistry, buffer formulation, cell culture media conditioning, and bulk reagent homogenization where scalability and operational stability are critical.

Key Features

• Brushless DC motor with 40 W nominal output delivers consistent torque across the full 100–1600 rpm speed range, enabling precise control over low-viscosity aqueous solutions as well as moderately viscous suspensions (e.g., polymer solutions up to ~500 mPa·s at 25 °C).
• Integrated LCD display shows real-time rotational speed and elapsed timer value (0–99 h 59 min), supporting unattended batch processing and protocol-driven workflows.
• Robust all-stainless-steel enclosure and workplate provide corrosion resistance, structural rigidity, and compatibility with routine laboratory cleaning agents—including 70% ethanol, isopropanol, and diluted sodium hypochlorite solutions.
• Water-resistant front-panel interface (IPX2-rated) mitigates risks from accidental spills during routine operation, enhancing safety in multi-user lab environments.
• Compact footprint (440 × 360 mm base area) optimizes bench space utilization while accommodating standard 5–20 L glass or plastic carboys, stainless steel reactors, or custom jacketed vessels.
• Analog rotary knob enables intuitive, stepless speed adjustment; clockwise rotation increases speed, counterclockwise to zero disables drive—no software or menu navigation required.

Sample Compatibility & Compliance

The HMS-40 accommodates cylindrical, conical, and rectangular containers fabricated from borosilicate glass, polypropylene, PETG, or stainless steel—provided internal dimensions permit stable placement of a compatible magnetic stir bar (recommended minimum length: 60 mm for 40 L volumes). It complies with IEC 61010-1:2010 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use) and meets EMC Directive 2014/30/EU for electromagnetic compatibility. While not certified for Class I Division 1 hazardous locations, its spark-free brushless motor architecture renders it suitable for use in general-purpose chemical laboratories handling non-flammable solvents and aqueous systems. No integrated temperature regulation is provided; users requiring thermal control must pair the unit with external water baths or jacketed vessels.

Software & Data Management

The HMS-40 operates as a standalone analog instrument with no embedded microprocessor, firmware, or digital communication interface (e.g., RS-232, USB, or Ethernet). Consequently, it does not generate electronic records, lack audit trail functionality, and is exempt from FDA 21 CFR Part 11 requirements. All operational parameters—including speed setpoint and timer duration—are manually entered and visually confirmed via the LCD. This architecture ensures deterministic behavior, zero firmware update dependencies, and immunity to cybersecurity vulnerabilities—making it appropriate for GLP-compliant environments where instrument qualification focuses on mechanical performance verification (e.g., speed accuracy ±3% FS per ISO 8573-1) rather than software validation.

Applications

• Preparation of large-volume buffers and media for bioprocessing (e.g., PBS, DMEM, MOPS-based extraction buffers).
• Homogenization of colloidal suspensions prior to filtration or centrifugation steps in nanoparticle synthesis workflows.
• Mixing of high-purity reagents for semiconductor wafer cleaning formulations where metallic leaching must be minimized (supported by stainless-steel wetted surfaces).
• Stirring of viscous enzyme reaction mixtures in enzymatic assay development, particularly where shear-sensitive proteins require gentle agitation.
• Batch-wise dissolution testing of pharmaceutical excipients under USP guidelines—when used with calibrated stir bars and standardized vessel geometry.

FAQ

Does the HMS-40 include a heating function?

No. The HMS-40 is a non-heated magnetic stirrer. It does not incorporate a hotplate or temperature control module.
What is the recommended stir bar size for 40 L volume?

A dual-blade or cross-shaped stir bar measuring 60–80 mm in length and 12–15 mm in diameter is optimal for turbulent yet uniform mixing in tall-form containers of this capacity.
Can the unit operate continuously for 24 hours?

Yes. The brushless motor and thermally optimized housing support uninterrupted operation within ambient conditions of 5–35 °C and ≤80% RH.
Is the workplate removable for cleaning?

No. The stainless-steel workplate is permanently integrated into the chassis to maintain mechanical stability under full-load conditions.
Does HUXI provide calibration documentation or traceable certificates?

Factory calibration data for speed accuracy (±3% at 1000 rpm) and timer deviation (<±0.5% over 1 h) can be supplied upon request; NIST-traceable certification requires third-party metrology service.