Hengping CH1215T-4JS Four-Position Magnetic Stirring Constant-Temperature Water Bath

Overview

The Hengping CH1215T-4JS is a precision-engineered four-position magnetic stirring constant-temperature water bath designed for laboratories requiring simultaneous thermal control and mechanical homogenization across multiple samples. Unlike conventional single-bath systems, this unit integrates four independently controlled magnetic stirrers—each with dedicated speed adjustment and real-time RPM readout—within a single 15-liter transparent acrylic bath chamber. Its operational principle relies on resistive heating combined with PID-regulated microprocessor temperature control, ensuring rapid thermal equilibration and exceptional stability (±0.05 °C) across the full working range of ambient +15 °C to 120 °C. The fully enclosed, four-sided transparent design enables unobstructed visual monitoring of sample behavior—including phase transitions, dissolution kinetics, or reaction progress—without compromising thermal integrity or operator safety. This architecture supports reproducible thermal conditioning under defined hydrodynamic conditions, making it suitable for method development and routine QC procedures where both temperature uniformity and mixing consistency are critical.

Key Features

• Four independent magnetic stirrers with continuous speed adjustment (0–1200 rpm typical range) and individual digital RPM display per position
• Microprocessor-based PID temperature controller with 0.1 °C resolution and auto-tuning capability for minimized overshoot and optimized settling time
• 15-liter working volume with transparent acrylic enclosure offering full 360° sample visibility and ergonomic access
• Internal recirculation system ensures uniform temperature distribution throughout the bath medium without external plumbing
• Stainless steel inner tank construction with corrosion-resistant finish for long-term compatibility with aqueous and mildly aggressive solutions
• Over-temperature protection and dry-run safeguard prevent heater damage during low-fluid or no-load operation
• Front-panel interface with intuitive keypad navigation and LED status indicators for real-time monitoring of setpoint, actual temperature, and stirrer activity

Sample Compatibility & Compliance

The CH1215T-4JS accommodates standard laboratory glassware including test tubes (up to Ø25 mm × 200 mm), beakers (50–500 mL), and reaction vials, with each position supporting independent thermal and agitation profiles. It complies with general electrical safety requirements per IEC 61010-1 for laboratory equipment and meets CE marking criteria for electromagnetic compatibility (EMC) and low-voltage directive conformity. While not certified to ISO/IEC 17025 or GLP-specific validation protocols out-of-the-box, the unit’s stable thermal performance and traceable control parameters support integration into validated workflows when accompanied by user-defined calibration and maintenance documentation. Its temperature stability (±0.05 °C) aligns with common requirements in ASTM D2196 (viscosity measurement), USP (compounding environment control), and ISO 17025 clause 5.4.2 for equipment suitability assessment.

Software & Data Management

This model operates as a standalone benchtop instrument with no embedded data logging or PC connectivity. All operational parameters—including set temperature, actual bath temperature, and individual stirrer speeds—are displayed locally via high-contrast LED indicators. For laboratories requiring audit trails or electronic record retention, optional external USB or RS-232 data loggers may be interfaced using analog output modules (0–5 V or 4–20 mA) available through third-party accessories. When deployed in regulated environments governed by FDA 21 CFR Part 11, users must implement procedural controls—including documented calibration schedules, operator training records, and manual entry logs—to ensure data integrity and traceability consistent with GxP expectations.

Applications

• Simultaneous temperature-controlled dissolution testing of pharmaceutical formulations across multiple concentration gradients
• Accelerated aging studies of polymer blends and elastomers under isothermal shear conditions
• Standardized pre-heating and homogenization of reagents prior to titration, spectrophotometry, or chromatographic injection
• Calibration verification of temperature-sensitive sensors (e.g., RTDs, thermistors) using multi-point immersion in a stable thermal field
• Controlled enzymatic reaction kinetics where precise thermal initiation and sustained mixing are required
• QC screening of surfactant cloud points, melting point determination of waxy suspensions, and thermal stability assessment of colloidal dispersions

FAQ

Can the CH1215T-4JS maintain temperature uniformity across all four positions simultaneously?

Yes—the internal recirculation system and optimized heater placement ensure temperature deviation ≤ ±0.05 °C between positions at steady state, verified by NIST-traceable probe mapping.
Is external cooling capability supported?

No—this is a heating-only bath; refrigerated circulation or Peltier-based cooling requires a separate chiller system or dual-mode bath model.
What is the maximum recommended liquid height for optimal stirring efficiency?

For consistent vortex formation and thermal transfer, fill level should be maintained between 8 L and 14 L; exceeding 14 L may reduce stir bar responsiveness in deeper vessels.
Does the unit support GLP-compliant calibration documentation?

It provides no built-in calibration certificate, but includes standardized calibration ports for third-party verification against ISO/IEC 17025-accredited labs.
Are replacement stir bars and bath liners available as spare parts?

Yes—Hengping offers OEM-compatible PTFE-coated stir bars (Ø8 × 30 mm, Ø10 × 40 mm) and replaceable silicone gasket kits for the acrylic housing.