CZGY HJ-6B Dual-Display Magnetic Stirrer with Independent Temperature Control

Overview

The CZGY HJ-6B Dual-Display Magnetic Stirrer is a precision-engineered benchtop laboratory instrument designed for simultaneous, independent control and monitoring of stirring speed and temperature across six parallel reaction stations. Utilizing permanent magnet coupling and PTFE-coated stir bars, it delivers consistent torque transmission without mechanical contact—ensuring contamination-free mixing and long-term operational stability. Each station integrates a dedicated DC motor and resistive heating element embedded beneath a corrosion-resistant stainless-steel heating plate (12 cm × 4 configuration), enabling uniform thermal distribution and rapid heat-up response. The system operates on the principle of electromagnetic rotation induction, where rotating magnetic fields generated by internal coils drive ferromagnetic stir bars immersed in samples. This non-invasive agitation method is especially suited for sealed vessels, low-volume reactions, and sensitive biological or chemical systems requiring inert atmosphere compatibility.

Key Features

• Six independent dual-display modules—each showing real-time RPM and temperature values with ±1 rpm resolution and ±0.5°C accuracy over the full 200–2000 rpm and RT+5°C–100°C ranges
• Full stainless-steel housing and heating plates engineered for chemical resistance, mechanical durability, and ease of decontamination under GLP-compliant lab protocols
• Dedicated 25 W DC motor per station ensures stable rotational output even at low speeds (down to 200 rpm) and high-viscosity loads up to 1 L aqueous or low-solvent media
• Individual 200 W heating circuits with PID-based temperature regulation provide fast thermal equilibration and minimal overshoot (<±0.8°C steady-state deviation)
• Overheat protection circuitry automatically disables heating if surface temperature exceeds 110°C, meeting IEC 61010-1 safety requirements for laboratory equipment
• Modular design supports integration into automated workflows via optional analog voltage outputs (0–5 V) for speed/temperature feedback to external data loggers or SCADA systems

Sample Compatibility & Compliance

The HJ-6B accommodates standard laboratory glassware including 50–1000 mL beakers, Erlenmeyer flasks, and round-bottom reaction vessels. Its non-contact stirring mechanism eliminates shaft seals and bearings, reducing maintenance and enabling use with volatile solvents, acidic/basic solutions, and sterile cell culture media when paired with autoclavable stir bars. The unit complies with ISO/IEC 17025 general requirements for testing and calibration laboratories and meets electrical safety standards per EN 61010-1:2019. While not intrinsically rated for Class I Division 1 hazardous locations, its sealed electronics and absence of sparking components permit safe operation in general chemistry labs adhering to NFPA 45 and OSHA 1910.1200 guidelines. All materials in contact with heating surfaces conform to FDA 21 CFR §177.1520 for repeated food-contact use—supporting applications in pharmaceutical excipient blending and nutraceutical formulation development.

Software & Data Management

The HJ-6B operates as a standalone instrument with no embedded firmware or network interface; however, its analog output capability enables traceable data acquisition in regulated environments. When connected to validated third-party data loggers (e.g., Omega OM-DAQPRO-5300 or Testo 176 T4), users can generate audit-ready records compliant with 21 CFR Part 11 requirements—including electronic signatures, time-stamped parameter logs, and change history tracking. Temperature and speed setpoints are manually entered via front-panel rotary encoders with tactile feedback, minimizing input error. For labs implementing paperless SOPs, CSV export from compatible loggers supports integration into LIMS platforms such as LabVantage or Thermo Fisher SampleManager.

Applications

• Parallel synthesis screening in medicinal chemistry, where six distinct reaction conditions (e.g., catalyst loading, solvent ratio, temperature ramp) must be evaluated simultaneously
• Buffer preparation and reagent equilibration in QC/QA labs supporting ISO 17025-accredited testing of raw materials per USP and
• Cell suspension homogenization prior to flow cytometry or viability assays—maintaining shear-sensitive morphology through low-RPM, high-torque agitation
• Standardization of dissolution media temperature in pharmacopeial dissolution testing (USP , EP 2.9.3) across multiple vessels
• Pre-analytical sample conditioning for ICP-MS, HPLC, and titration workflows requiring precise thermal stabilization before injection or endpoint detection

FAQ

Can the HJ-6B be used with closed-system reactors such as Schlenk lines or pressure tubes?
Yes—its magnetic coupling design allows operation with sealed vessels provided the stir bar is appropriately sized and the vessel wall thickness does not exceed 12 mm for standard PTFE-coated bars.
Is calibration documentation available for metrological traceability?
CZGY provides factory calibration certificates (NIST-traceable reference standards) upon request; field recalibration intervals are recommended every 12 months or after 2000 operating hours.
Does the unit support external temperature probes for sample-core measurement?
No—the built-in sensor measures plate surface temperature only; for sample-specific control, users must integrate an external Pt100 probe with a compatible PID controller.
What maintenance is required to ensure long-term performance?
Routine cleaning of heating plates with ethanol or mild detergent; annual inspection of motor brushes (if applicable) and verification of thermal cutoff function using calibrated thermocouple.
Are replacement parts like stir bars and heating plates available through CZGY?
Yes—CZGY stocks PTFE-encapsulated stir bars (5–30 mm), stainless-steel heating plates, and full motor assemblies with lead times under 5 business days for international orders.