CZGY HJ-6A Six-Position Digital Temperature-Controlled Magnetic Stirrer
| Brand | CZGY |
|---|---|
| Origin | Jiangsu, China |
| Manufacturer Type | Direct Manufacturer |
| Instrument Type | Magnetic Stirrer |
| Max Stirring Volume | 1 L × 6 positions |
| Speed Range | 0–2000 rpm |
| Temperature Control Range | Ambient to 100 °C |
Overview
The CZGY HJ-6A is a six-position digital temperature-controlled magnetic stirrer engineered for parallel sample processing in analytical, quality control, and research laboratories. It operates on the principle of magnetic coupling—where a rotating permanent magnet beneath the heated ceramic or aluminum plate induces synchronous rotation of PTFE- or glass-coated magnetic stir bars immersed in liquid samples. Each of the six independently controllable stations integrates a DC motor-driven stirring mechanism and resistive heating element, enabling simultaneous yet isolated regulation of speed and temperature across all positions. Designed for reproducible mixing under controlled thermal conditions, the HJ-6A supports routine applications such as solution homogenization, reagent dissolution, buffer equilibration, and pre-analytical sample conditioning—particularly where consistency across multiple vessels is critical for statistical validity or regulatory compliance.
Key Features
- Six independent stirring and heating stations with individual digital LED displays for real-time monitoring of speed (rpm) and temperature (°C)
- Adjustable speed range from 0 to 2000 rpm per station, with smooth ramp-up control to prevent stir bar ejection or vortex instability
- Precise temperature control from ambient to 100 °C, calibrated via integrated PID algorithm for minimal overshoot and stable setpoint maintenance
- Robust construction featuring a corrosion-resistant aluminum alloy heating plate (Ø120 mm per position) and sealed DC motors rated for continuous operation
- Individual power switches and safety cutoffs per station; overload protection prevents thermal runaway during extended use
- Compliant with IEC 61010-1 safety standards for laboratory electrical equipment; includes grounding terminal for ESD and fault-current mitigation
Sample Compatibility & Compliance
The HJ-6A accommodates standard laboratory glassware including beakers (up to 1000 mL), Erlenmeyer flasks, and cylindrical reaction vessels placed directly on the heated surface. Stir bar compatibility spans diameters from 5 mm to 30 mm, with optimal performance achieved using chemically inert, temperature-stable PTFE-encapsulated magnets. The instrument meets general requirements for GLP-compliant environments when used in conjunction with documented SOPs—particularly for sample preparation steps preceding HPLC, titration, spectrophotometry, or microbiological assays. While not certified to ISO/IEC 17025 or FDA 21 CFR Part 11 out-of-the-box, its discrete station controls and stable thermal output support traceable method execution in regulated workflows.
Software & Data Management
The HJ-6A is a standalone analog-digital hybrid instrument with no embedded microprocessor-based data logging or PC connectivity. All operational parameters are set manually via front-panel rotary dials and push-button interfaces. For laboratories requiring audit trails, users may integrate external USB thermocouple loggers or industrial-grade data acquisition systems (e.g., Omega OM-DAQPRO series) to record temperature and speed profiles over time. Calibration verification can be performed using NIST-traceable RTD probes and tachometers—recommended annually or per internal QA schedule. No firmware updates or software drivers are required or supported.
Applications
- Simultaneous digestion and dissolution of environmental soil/water samples prior to heavy metal analysis (EPA Method 3050B, ASTM D3974)
- Buffer and standard solution preparation in pharmaceutical QC labs, adhering to USP compounding guidelines
- Cell culture media warming and gentle agitation during pre-incubation steps
- Accelerated stability testing of formulations under controlled thermal-mixing conditions
- Parallel synthesis support in organic chemistry labs, especially for low-viscosity solvent systems
- Calibration standard homogenization for viscometry, conductivity, and pH meter validation protocols
FAQ
What is the maximum recommended continuous operating time at high speed?
At speeds above 1500 rpm, continuous operation should not exceed 4 hours per station to maintain motor longevity and thermal stability.
Can the HJ-6A be used with corrosive solvents such as concentrated acids or halogenated organics?
Yes—provided appropriate stir bars (e.g., PTFE/glass composite) and chemically resistant glassware are used; however, direct contact between aggressive vapors and the aluminum plate surface must be avoided to prevent oxidation.
Is temperature calibration traceable to national standards?
The unit does not include factory-issued calibration certificates, but users may perform field calibration using a NIST-traceable thermometer and documented procedure per ISO/IEC 17025 Section 6.6.
Does the device support external temperature probe input for closed-loop feedback?
No—the built-in sensor measures plate surface temperature only; it does not accept external PT100 or thermocouple inputs.
What safety certifications does the HJ-6A carry?
It conforms to IEC 61010-1:2010 for electrical safety in laboratory equipment and includes earth-grounding provision per Class I appliance requirements.
