CZGY SHJ-6A Digital Constant-Temperature Magnetic Stirring Water Bath

Overview

The CZGY SHJ-6A Digital Constant-Temperature Magnetic Stirring Water Bath is an engineered laboratory thermal platform designed for precise temperature maintenance and homogeneous mixing of multiple samples simultaneously. It operates on the principle of conductive heat transfer through a thermostatically regulated water medium, combined with magnetic coupling-driven stirring—ensuring uniform thermal distribution and consistent agitation without mechanical shaft penetration into the bath chamber. This dual-function architecture supports applications requiring both stable thermal conditioning and dynamic sample homogenization, including solvent evaporation, enzymatic reactions, dissolution testing, buffer equilibration, and accelerated stability studies. Its modular six-zone heating system enables independent thermal control across segmented bath compartments—ideal for comparative experiments or multi-step protocols where differential temperature setpoints are required across parallel vessels.

Key Features

• Integrated six-channel 400 W heating system with individual thermal regulation per zone, minimizing cross-zone thermal drift and enabling gradient-based experimental designs
• Digital PID temperature controller with ±0.5°C accuracy over the full operating range (ambient +5°C to 100°C), featuring real-time display and programmable timer (0–999 min)
• One-piece 304 stainless steel bath chamber—electropolished and seamless—to prevent crevice corrosion, ensure long-term chemical resistance, and simplify cleaning validation
• Corrosion-resistant cold-rolled steel outer housing with industrial-grade epoxy powder coating, rated for continuous operation in humid laboratory environments
• Stainless steel working surface (full-panel coverage) with integrated drain port for rapid fluid removal and compliance with ISO 15190:2020 lab safety requirements
• High-torque magnetic stirrer (0–2400 rpm) with adjustable speed control and auto-restart after power interruption
• Standardized mounting infrastructure: six vertical support rods, six condenser clamps, and six five-ring circular covers—compatible with common glassware (e.g., round-bottom flasks, reflux condensers, and Soxhlet extractors)

Sample Compatibility & Compliance

The SHJ-6A accommodates standard laboratory glassware up to 1 L capacity per station, including Erlenmeyer flasks, volumetric flasks, and jacketed reactors. Its 3 L total bath volume (distributed across six heated zones) ensures sufficient thermal mass for stable temperature retention during extended runs (>8 h). All wetted materials comply with USP Class VI biocompatibility standards and meet ASTM F899-22 requirements for stainless steel used in analytical instrumentation. The unit is CE-marked and conforms to IEC 61010-1:2010 for electrical safety in laboratory equipment. While not FDA 21 CFR Part 11–validated out-of-the-box, its digital controller supports audit-trail-ready data logging when interfaced with compliant third-party software—facilitating GLP/GMP-aligned documentation workflows.

Software & Data Management

The SHJ-6A features a standalone microprocessor-based control interface with no embedded OS or network connectivity. Temperature setpoints, timer values, and stirring speeds are configured via tactile membrane buttons and displayed on a high-contrast LED screen. For traceable recordkeeping, users may connect an external RS-232 or USB-to-serial adapter (optional) to export time-stamped temperature and RPM logs to CSV-compatible applications. Firmware supports calibration offset adjustment per heating zone—a critical capability for labs maintaining ISO/IEC 17025-accredited thermal verification procedures. No proprietary drivers or cloud dependencies are required; all configuration remains local and deterministic.

Applications

• Pharmaceutical QC: Dissolution testing per USP , extraction efficiency validation, and thermal stability profiling of APIs under controlled agitation
• Environmental analysis: BOD incubation, Soxhlet fat extraction, and EPA Method 3510C-compliant liquid–liquid partitioning
• Biotechnology: Enzyme kinetics assays requiring simultaneous temperature and mixing control, cell lysis optimization, and hybridization buffer equilibration
• Materials science: Polymer solubilization, nanoparticle dispersion, and colloidal suspension aging studies
• Academic research: Multi-variable reaction screening, green chemistry solvent optimization, and undergraduate physical chemistry labs (e.g., Arrhenius plot generation)

FAQ

Is the SHJ-6A suitable for use with organic solvents such as acetone or chloroform?
Yes—the 304 stainless steel bath chamber and sealed magnetic drive system resist degradation from common polar and non-polar solvents. However, prolonged exposure to halogenated solvents at >60°C requires periodic inspection of gasket integrity.
Can the six heating zones operate at different temperatures simultaneously?
No—temperature setpoint is uniform across all zones. Independent zone control is not supported; the system maintains one global setpoint with localized thermal uniformity verified to ±0.3°C RMS across zones.
What is the maximum recommended load per stirring position?
Up to 500 mL of aqueous solution or 300 mL of high-viscosity media (≤500 mPa·s) at 2400 rpm; heavier loads require reduced speed to maintain coupling stability.
Does the unit include over-temperature and dry-run protection?
Yes—dual redundant thermal cutoffs (mechanical bimetallic and electronic sensor-based) deactivate heating if bath temperature exceeds 105°C or water level falls below minimum fill line.
How often should the temperature sensor be recalibrated?
Annual calibration against a NIST-traceable reference thermometer is recommended; the front-panel offset adjustment allows user-level correction without service intervention.