CZGY HJ-5A Digital Multifunctional Heating Magnetic & Mechanical Stirrer

Overview

The CZGY HJ-5A Digital Multifunctional Heating Magnetic & Mechanical Stirrer is an integrated laboratory platform engineered for precision thermal and mechanical control in synthetic chemistry, materials science, and quality control workflows. Unlike single-mode stirrers, the HJ-5A combines two independent stirring mechanisms—high-torque mechanical overhead stirring and robust magnetic stirring—within a single chassis, enabling simultaneous or selective operation based on sample viscosity, container geometry, and reaction protocol requirements. Its core architecture employs a permanent-magnet DC motor for magnetic drive and a brushless DC motor for overhead agitation, both regulated by a microprocessor-based digital speed controller ensuring stable rotational output with minimal drift (<±1 rpm) across the full range. The heating system integrates three interchangeable thermal modules: a ceramic-coated aluminum hotplate, a stainless-steel water/oil bath vessel, and a universal flat-bottom electric heating mantle—each independently controllable via a shared PID temperature regulator with ambient+5°C to 300°C span and ±1°C setpoint accuracy. Designed for reproducibility under GLP-aligned conditions, the unit supports timed operation (0–999 min), real-time parameter monitoring, and user-configurable alarm thresholds.

Key Features

• Dual-mode stirring capability: Independent magnetic (200–2000 rpm) and mechanical (200–3000 rpm) drives with synchronized digital speed display and fine-resolution adjustment (1 rpm increments)
• Triple-heating configuration: Interchangeable hotplate (800 W), water/oil bath heater (700 W), and flat-bottom electric heating mantle (250 W) for flexible thermal coupling across glassware types
• PID temperature regulation with programmable setpoint, over-temperature alarm (AL), hysteresis control (HY), and sensor offset correction (SC ±50°C)
• Integrated timer with non-volatile memory retention; supports continuous operation or precise duration-based endpoint termination
• Robust mechanical design: Chrome-plated support rods, corrosion-resistant cross joints, silicone rubber clamps, and cold-resistant condenser clamp included for modular assembly
• Compliance-ready interface: All operational parameters—including speed, temperature, time, and alarm status—are displayed simultaneously on dual-line LED screen without menu nesting

Sample Compatibility & Compliance

The HJ-5A accommodates standard laboratory vessels up to 1 L capacity, including round-bottom flasks (50–1000 mL), beakers, crystallization dishes, and jacketed reactors. Magnetic stirring is optimized for low-to-medium viscosity liquids (e.g., aqueous solutions, organic solvents, polymer precursors); mechanical stirring supports higher-viscosity systems (e.g., slurries, viscous resins, heterogeneous catalytic suspensions) using supplied PTFE-coated stir bars and stainless-steel stirring rods. The unit meets general safety requirements per IEC 61010-1:2010 for electrical equipment used in laboratory environments. While not certified to UL/CSA standards out-of-box, its grounded 3-prong power input, thermal cutoff protection, and insulated heating surfaces align with common institutional procurement policies for Class II lab instruments. For regulated environments, users may configure audit trails manually via timestamped log entries in external notebooks—though native 21 CFR Part 11 compliance requires third-party data capture software integration.

Software & Data Management

The HJ-5A operates as a standalone hardware platform with no embedded firmware update capability or USB/RS-232 connectivity. All operational data—including current speed, actual temperature, elapsed time, and active mode—is presented in real time on the front-panel dual-digit LED display. Parameter configuration (SET, △, ▽, RUN/STOP keys) follows a deterministic keypad-driven workflow with no hidden menus or contextual prompts. Users may record operational history manually using the built-in timer and visual indicators (green RUN LED, red STOP LED). For laboratories requiring electronic data integrity, the instrument supports synchronization with external data loggers via analog voltage output (optional add-on module, not included) or manual transcription into LIMS-compatible spreadsheets. Factory-default settings ensure immediate usability upon power-up, minimizing training overhead for undergraduate teaching labs and routine QC applications.

Applications

• Synthetic organic chemistry: Reflux reactions, Grignard preparations, and multi-step condensations requiring simultaneous heating and vigorous mixing
• Materials synthesis: Sol-gel processing, nanoparticle precipitation, and polymer emulsification where shear rate and thermal profile must be decoupled
• Pharmaceutical development: Dissolution testing, excipient blending, and stability studies compliant with USP and
• Environmental analysis: Digestion of soil/water samples per EPA Method 3050B and ASTM D5587, leveraging precise temperature ramping and agitation consistency
• Food science research: Emulsion formation, enzymatic hydrolysis, and thermal denaturation assays requiring controlled shear and thermal history

FAQ

Can the HJ-5A operate both magnetic and mechanical stirring simultaneously?

Yes—the unit features independent motor circuits and dual-speed control logic, allowing concurrent operation without cross-interference.
What is the maximum recommended viscosity for magnetic stirring mode?

Magnetic stirring is validated for Newtonian fluids up to ~500 mPa·s at 25°C; above this, mechanical stirring is advised for consistent homogenization.
Is calibration documentation provided with the instrument?

The HJ-5A ships with factory-set calibration; NIST-traceable certificates are available upon request at additional cost.
Does the temperature sensor support immersion in oil baths?

Yes—the included PT100-type probe is rated for direct immersion in mineral oil, silicone oil, and water up to 300°C.
How is overheating prevented during dry operation?

An embedded thermal cutoff switch interrupts power to the heating element if surface temperature exceeds 320°C, independent of PID regulation.