HUXI HMS-20 High-Capacity Magnetic Stirrer

Overview

The HUXI HMS-20 High-Capacity Magnetic Stirrer is an engineered solution for reproducible, low-shear mixing of large-volume liquid samples in research laboratories, quality control environments, and industrial R&D settings. Utilizing a permanent magnet coupling principle, the device transfers rotational energy from a brushless DC motor to a magnetic stir bar immersed in the sample vessel—without mechanical contact or seals—ensuring contamination-free operation and minimal maintenance. Designed specifically for applications requiring stable agitation of up to 20 L volumes, the HMS-20 integrates precise speed control, integrated heating capability (RT+5°C to 100°C), and robust thermal management within a compact footprint (310 × 250 × 100 mm). Its sealed stainless-steel housing and corrosion-resistant workplate support long-term use in demanding chemical and biological workflows, including buffer preparation, reagent dissolution, cell culture media conditioning, and polymer solution homogenization.

Key Features

• Brushless DC motor with 25 W nominal output—engineered for continuous duty cycles, high torque at low speeds, and extended service life without carbon brush replacement or lubrication.
• Continuous rotary speed adjustment (100–1600 rpm) via intuitive front-panel knob; zero-position detent at full counter-clockwise rotation ensures unambiguous power-off state.
• LCD display showing real-time rotational speed and elapsed timer value (0–99 h 59 min), supporting protocol-driven experiments requiring time-stamped agitation sequences.
• Heated stainless-steel workplate with uniform thermal distribution across the full surface area; temperature setpoint accuracy ±2°C at 100°C under load (calibrated per ISO 17025 traceable procedures).
• IPX2-rated splash-resistant front panel design mitigates risk of accidental liquid ingress during routine handling—aligned with IEC 61010-1 safety requirements for laboratory electrical equipment.
• Structurally reinforced 304 stainless-steel enclosure and workplate capable of supporting vessels up to 20 L (maximum static load ≥25 kg), minimizing vibration-induced resonance even at upper-speed ranges.

Sample Compatibility & Compliance

The HMS-20 accommodates standard laboratory glassware—including beakers (up to 5 L), cylindrical tanks (up to 20 L), and jacketed reactors—when paired with appropriately sized magnetic stir bars (e.g., PTFE-coated elliptical or cross-shaped bars ≥60 mm length). It complies with CE marking requirements under the EU Machinery Directive 2006/42/EC and Low Voltage Directive 2014/35/EU. Electrical safety certification conforms to IEC 61010-1:2010 (Edition 3), including dielectric strength testing and protective earth continuity verification. While not inherently GLP/GMP-certified, the instrument supports audit-ready documentation when used with validated SOPs—particularly where timer logging and speed consistency are critical for method reproducibility (e.g., ASTM D2196 viscosity pre-mixing protocols).

Software & Data Management

The HMS-20 operates as a standalone analog-digital hybrid system with no embedded firmware or network interface. All operational parameters—including speed setpoint, timer duration, and temperature target—are configured manually via physical controls. The LCD provides local readout only; no data export, USB connectivity, or PC interface is included. For laboratories requiring electronic recordkeeping, integration with external data loggers (e.g., Omega OM-DAQPRO-5300 series) via analog 0–5 V output (optional accessory port, not standard) enables timestamped capture of speed and temperature trends compliant with FDA 21 CFR Part 11 Annex 11 principles when paired with appropriate validation documentation.

Applications

• Preparation of large-batch aqueous and organic solutions in analytical chemistry labs—especially for ICP-MS calibration standards, titrant stock solutions, and mobile phase blending.
• Homogenization of viscous biological matrices such as agarose gels, collagen suspensions, and microbial growth media prior to sterilization or dispensing.
• Controlled dissolution testing per USP for pharmaceutical excipients, where consistent agitation intensity and thermal stability directly impact solubility profile reproducibility.
• Supporting environmental testing workflows—including EPA Method 300.0 (anion analysis) and ASTM D5848 (detergent biodegradability)—where standardized mixing kinetics are prerequisite for inter-laboratory comparability.
• Process development in pilot-scale biomanufacturing, enabling scalable parameter transfer from benchtop (e.g., 2 L) to intermediate (20 L) mixing conditions without altering shear regime fundamentals.

FAQ

Does the HMS-20 support external temperature probe feedback control?

No—the unit uses internal thermistor-based open-loop heating; no provision exists for external Pt100 or thermocouple input.
Is the workplate compatible with magnetic stir bars larger than 80 mm?

Yes—provided the bar maintains axial symmetry and fits within the 130 mm effective diameter of the heated zone; optimal performance observed with bars ≤75 mm in length.
Can the timer function be disabled to enable continuous operation?

Yes—setting the timer to “0” bypasses automatic shutdown; motor and heater remain active until manually powered off.
What is the maximum allowable ambient humidity for safe operation?

Relative humidity must not exceed 80% non-condensing at operating temperatures between 5°C and 35°C, as specified in IEC 61010-1 Clause 6.4.2.
Is the stainless-steel workplate resistant to hydrochloric acid fumes?

304 stainless steel offers moderate resistance to dilute HCl vapor at room temperature but is not recommended for prolonged exposure to concentrated acidic atmospheres; use in well-ventilated fume hoods is advised.