CZGY HJ-6W Six-Station Brushless Motor Magnetic Stirrer with Digital Speed Display

Overview

The CZGY HJ-6W is a six-position benchtop magnetic stirrer engineered for reproducible, simultaneous agitation of multiple samples under controlled rotational conditions. It operates on the principle of magnetic coupling—where a rotating permanent magnet beneath a non-magnetic, thermally stable stainless-steel plate induces synchronized rotation of PTFE-coated magnetic stir bars immersed in vessels. Unlike gear-driven or belt-coupled systems, the HJ-6W employs brushless DC motors at each station, eliminating mechanical wear, carbon dust generation, and torque drop at low speeds—critical for long-duration experiments requiring stable shear input. Designed for routine QC testing, buffer preparation, dissolution studies, and reagent homogenization in pharmaceutical, environmental, and academic laboratories, the unit delivers consistent rotational energy across all six positions without cross-talk or speed drift. Its absence of internal heating elements distinguishes it from hotplate stirrers, making it suitable for temperature-sensitive applications where external thermal control (e.g., water baths or climate chambers) is independently managed.

Key Features

• Six independent stirring stations with isolated brushless DC motors—ensuring zero inter-channel interference and uniform torque delivery across the full 200–2000 rpm range
• Digital RPM display for each station, enabling real-time verification and documentation of rotational speed per vessel—essential for SOP compliance and audit readiness
• Stainless-steel top plate (12 cm × 6 configuration) with corrosion-resistant surface finish, compatible with aqueous, mildly acidic, and organic solvent environments
• Precise digital timer (0–9999 minutes) with auto-shutdown functionality, supporting unattended operation for extended mixing protocols including solubility profiling and enzymatic reaction equilibration
• Low-noise operation (<45 dB(A) at 1 m) and minimal electromagnetic emission—validated for use adjacent to sensitive instrumentation such as balances, pH meters, and spectrophotometers
• Front-panel push-button interface with tactile feedback; no software dependency for basic operation—reducing validation burden in regulated environments

Sample Compatibility & Compliance

The HJ-6W accommodates standard laboratory glassware up to 1 L capacity per station—including beakers, Erlenmeyer flasks, and cylindrical sample bottles—when used with appropriately sized stir bars (typically 30–50 mm length, 8–10 mm diameter). It complies with IEC 61010-1:2010 safety requirements for electrical equipment for measurement, control, and laboratory use. While not intrinsically rated for hazardous locations, its non-sparking brushless motor architecture meets general-purpose lab safety expectations under ISO/IEC 17025-accredited quality systems. The unit supports GLP-aligned workflows through traceable speed/timer settings and facilitates alignment with USP & EP monographs requiring defined agitation parameters during dissolution or extractable/leachable studies.

Software & Data Management

The HJ-6W operates as a standalone instrument with no embedded firmware or network connectivity. All operational parameters—including set speed, elapsed time, and station activation—are manually entered and retained only during active power cycles. For laboratories requiring electronic recordkeeping, integration is achieved via external documentation: users may log settings in LIMS or ELN platforms using the displayed RPM values and timer outputs. No FDA 21 CFR Part 11-compliant audit trail is generated internally; however, the device’s deterministic behavior, lack of configurable memory, and physical-only interface simplify qualification (IQ/OQ) and reduce data integrity risk compared to microprocessor-dependent stirrers.

Applications

• Parallel preparation of calibration standards and QC reference solutions in analytical chemistry labs
• Homogenization of cell culture media, buffers, and diluents prior to filtration or sterilization
• Supporting ASTM D4097 (standard test method for determination of sediment volume in lubricating oils) via standardized agitation protocols
• Dissolution testing per USP , where consistent, non-contact agitation minimizes vessel wall interaction and bubble entrapment
• Environmental sample digestion pre-treatment—particularly for EPA Method 3050B extractions requiring prolonged, low-shear mixing
• Material science workflows involving polymer dispersion, nanoparticle suspension stabilization, and colloidal synthesis under inert atmosphere (when used inside gloveboxes)

FAQ

Does the HJ-6W include heating functionality?
No. This model is a magnetic stirrer only—without integrated heating elements. It is intended for use with externally controlled temperature environments.
Can the unit operate continuously for 72 hours or longer?
Yes. The brushless motor design and thermal management allow uninterrupted operation within ambient temperatures of 15–30°C and relative humidity ≤70% RH, provided proper ventilation is maintained.
Is calibration required for speed accuracy?
While not mandatory per regulatory standards for non-GMP mixing tasks, users performing validated processes should verify rotational speed annually using a calibrated tachometer—traceable to NIST or equivalent national metrology institute.
What stir bar size is recommended for optimal performance at 2000 rpm?
For 1 L vessels, a 40 mm × 8 mm elliptical PTFE-coated stir bar provides stable vortex formation and minimal splashing at maximum speed.
Are replacement motors or control boards available for field service?
Yes. CZGY supplies OEM-grade spare parts—including individual motor assemblies and PCBs—with documented service intervals and torque specifications for authorized maintenance personnel.