CZGY HJ-6AH Six-Station Digital Temperature-Controlled Magnetic Stirrer

Overview

The CZGY HJ-6AH is a six-station digital magnetic stirrer engineered for precise, independent temperature and speed control across parallel sample processing workflows. It operates on the principle of magnetic coupling—where a rotating permanent magnet beneath the heating plate induces synchronous rotation of a magnetic stir bar immersed in the sample vessel—enabling contactless agitation without mechanical seals or moving parts penetrating the container. This architecture ensures high reproducibility, minimal contamination risk, and compatibility with sealed or volatile systems. Designed for routine laboratory applications requiring simultaneous conditioning of multiple samples—including dissolution testing, buffer preparation, reagent synthesis, and standard curve development—the HJ-6AH integrates PTC-based resistive heating with closed-loop PID temperature regulation and brushless DC motor drive technology. Its modular station layout supports consistent thermal and hydrodynamic environments across all six positions, making it suitable for method development, QC batch verification, and GLP-compliant sample conditioning where inter-station variability must remain within defined tolerance limits.

Key Features

• Six independent stirring stations, each equipped with dual digital LED displays for real-time monitoring of rotational speed (0–2000 rpm) and plate temperature (RT +5°C to 100°C)
• Brushless DC motors per station ensure low noise, extended service life, and ±1 rpm speed stability under load
• Stainless steel heating plates (12 cm diameter × 6) provide uniform thermal distribution and corrosion resistance in aqueous and mildly acidic/alkaline environments
• Individual timer control (0–999 minutes) per station enables staggered start/stop sequencing and unattended operation
• Over-temperature protection circuitry automatically disables heating if sensor feedback exceeds user-set limit or detects thermal runaway
• Compact benchtop footprint (approx. 420 × 280 × 120 mm) optimized for shared lab spaces without compromising accessibility or ventilation

Sample Compatibility & Compliance

The HJ-6AH accommodates standard laboratory glassware including beakers (50–1000 mL), Erlenmeyer flasks, and round-bottom flasks up to 1 L capacity per station. Stir bar selection (e.g., PTFE-coated, elliptical, or cross-shaped) is determined by viscosity, volume, and required shear profile—supporting low-viscosity aqueous solutions through moderately viscous polymer dispersions (<500 mPa·s). The device complies with IEC 61010-1:2010 safety standards for electrical equipment used in laboratory environments. While not certified to ISO/IEC 17025 or FDA 21 CFR Part 11 out-of-the-box, its digital logging capability (via optional RS-232 or USB interface add-ons) supports traceable data capture when integrated into validated workflows adhering to GMP/GLP documentation requirements.

Software & Data Management

The HJ-6AH operates as a standalone instrument with no embedded operating system or proprietary software dependency. All parameter inputs and status outputs are managed locally via tactile membrane buttons and segmented LED displays. For laboratories requiring electronic record retention, third-party data acquisition systems can interface with the unit’s analog output ports (if fitted) or external temperature/speed sensors placed in situ. When deployed in regulated environments, users may implement manual logbooks or integrate the device into broader LIMS or ELN platforms using standardized metadata tagging (e.g., station ID, timestamp, setpoint, actual reading). Audit trails must be maintained externally, as the base model does not support user authentication, electronic signatures, or change-control history.

Applications

• Simultaneous pH adjustment and homogenization of calibration standards across six buffers (e.g., pH 4.01, 7.00, 9.21)
• Dissolution testing of solid dosage forms under USP Apparatus II conditions, with temperature maintenance at 37.0 ± 0.5°C
• Preparation of homogeneous catalyst suspensions prior to ICP-MS sample introduction
• Controlled warming and mixing of enzymatic reaction mixtures during kinetic assay setup
• Parallel dilution series generation for ELISA or qPCR master mixes under sterile laminar flow hoods
• Conditioning of reference materials for inter-laboratory proficiency testing programs

FAQ

Is the HJ-6AH compatible with non-aqueous solvents such as acetone or ethanol?
Yes—provided appropriate PTFE- or glass-coated stir bars are used and ventilation protocols are observed. The stainless steel plate surface is chemically inert to common organic solvents, though prolonged exposure to halogenated compounds is not recommended.
Can individual stations be operated without heating while others maintain temperature control?
Yes. Each station functions autonomously; heating and stirring can be enabled or disabled independently per position.
What is the maximum ambient temperature at which the unit maintains stable 100°C plate temperature?
Under standard laboratory conditions (20–25°C ambient, still air), the unit achieves full-range temperature control. At ambient temperatures exceeding 30°C, plateau stability at 100°C may require extended equilibration time and reduced thermal load (e.g., smaller volumes or lower setpoints).
Does the device support external probe input for solution temperature feedback instead of plate-surface sensing?
No—the built-in temperature sensor measures heating plate surface temperature only. For solution-core temperature validation, users must employ separate calibrated immersion probes and adjust setpoints empirically.
Are replacement parts such as stir bars, fuses, or heating elements available directly from CZGY?
Yes. CZGY supplies OEM-certified consumables and field-replaceable components—including 6-piece stir bar kits, thermal fuses, and complete heating module assemblies—with documented part numbers and compatibility matrices provided upon request.