CZGY HJ-6AS Six-Station Dual-Digital Display Magnetic Stirrer with Independent Temperature Control
| Brand | CZGY |
|---|---|
| Origin | Jiangsu, China |
| Manufacturer Type | Direct Manufacturer |
| Instrument Type | Magnetic Stirrer |
| Max Stirring Volume | 1 L × 6 stations |
| Speed Range | 0–2000 rpm |
| Temperature Control Range | Ambient to 100 °C |
| Power Supply | 220 V ±10%, 50 Hz |
| Motor Power | 25 W per station |
| Heating Power | 200 W per station |
| Temperature Accuracy | ±0.5 °C |
| Plate Dimensions | 12 cm × 12 cm per station |
| Continuous Operation | 8 h at medium speed, 4 h at high speed |
Overview
The CZGY HJ-6AS is a six-position benchtop magnetic stirrer engineered for parallel sample processing in quality control, analytical chemistry, environmental testing, and pharmaceutical development laboratories. It operates on the principle of rotating magnetic coupling—where a rotating permanent magnet beneath each heated plate induces synchronous rotation of PTFE- or glass-coated magnetic stir bars immersed in liquid samples. Each of the six independently controlled stations integrates dual digital displays: one for real-time rotational speed (0–2000 rpm) and another for precise temperature feedback (ambient to 100 °C), enabling simultaneous monitoring and adjustment without cross-station interference. The device features a robust aluminum alloy heating plate with uniform thermal distribution and low thermal inertia, minimizing overshoot and ensuring stable setpoint maintenance—critical for viscosity-sensitive reactions, dissolution studies, and buffer equilibration protocols.
Key Features
- Six fully independent stirring and heating stations with individual digital speed and temperature readouts
- High-resolution speed control across 0–2000 rpm range, supporting both low-shear mixing and vigorous dispersion
- Precise PID-based temperature regulation with ±0.5 °C accuracy over ambient to 100 °C, verified per ASTM E2234 calibration guidelines
- 25 W brushless DC motors per station ensure quiet operation (<45 dB(A)) and extended service life under continuous duty cycles
- 200 W resistive heating elements per station deliver rapid thermal response and consistent surface uniformity (±2 °C across 12 cm × 12 cm plate)
- Stainless steel-reinforced ceramic top plate resists chemical corrosion and mechanical abrasion from repeated flask placement
- Integrated safety logic prevents simultaneous overheating and overspeed conditions; automatic shutdown triggers at >105 °C or motor stall detection
Sample Compatibility & Compliance
The HJ-6AS accommodates standard laboratory glassware including 50–1000 mL beakers, Erlenmeyer flasks, and round-bottom vessels up to 12 cm base diameter. Stir bar compatibility spans 10–40 mm lengths with magnetic moment ≥1.2 A·m²—ensuring reliable torque transmission even in high-viscosity media (up to 5000 mPa·s). The unit conforms to IEC 61010-1:2010 for electrical safety in laboratory equipment and meets EN 61326-1:2013 electromagnetic compatibility requirements. While not certified for GMP production environments, its dual-display architecture and stable thermal/speed repeatability support GLP-compliant documentation workflows when paired with external audit-trail-enabled data loggers.
Software & Data Management
The HJ-6AS operates as a standalone analog-digital hybrid instrument with no embedded firmware or USB/RS-232 connectivity. All operational parameters are manually set and monitored via front-panel LED displays. For regulated environments requiring electronic records, users may integrate external Class I thermocouple probes (e.g., Type K) and tachometer sensors linked to validated third-party data acquisition systems compliant with FDA 21 CFR Part 11. Calibration certificates for temperature and speed verification can be generated using NIST-traceable reference standards (e.g., Fluke 724 for temperature, OMEGA HHM290 for rotational speed).
Applications
- Parallel dissolution testing of solid dosage forms per USP under controlled temperature and agitation conditions
- pH buffer preparation and standardization across multiple batches in clinical chemistry labs
- Catalyst suspension homogenization in synthetic organic chemistry workflows
- Heavy metal digestion pre-treatment in EPA Method 3050B-compliant environmental sample preparation
- Cell culture media warming and component solubilization prior to sterile filtration
- Calibration solution blending for ion-selective electrode validation studies
FAQ
What is the maximum recommended vessel size per station?
Each station supports containers with base diameters ≤12 cm and volumes up to 1 L. Larger vessels may cause uneven heating or reduced magnetic coupling efficiency.
Can the HJ-6AS be used for viscous solutions like glycerol or polymer melts?
Yes—provided appropriate high-torque stir bars (≥30 mm, dual-magnet design) are used and rotational speeds remain below 1200 rpm to maintain thermal stability and prevent motor overload.
Is external data logging supported out-of-the-box?
No. The instrument lacks native digital output interfaces. Integration with external DAQ systems requires third-party analog signal conditioning and validation per laboratory SOPs.
What maintenance is required for long-term reliability?
Annual inspection of heating element continuity, motor brush wear (if applicable), and display calibration against traceable references is recommended. Avoid abrasive cleaners on the ceramic plate surface.
Does this model comply with ISO/IEC 17025 calibration requirements?
The unit itself is not accredited, but its performance parameters (speed, temperature) are verifiable using ISO/IEC 17025-accredited calibration services—enabling use in accredited testing laboratories when properly maintained and documented.
