Yiheng DU-3GW / DU-3GO Integrated Constant-Temperature Magnetic Stirring Water & Oil Bath Circulator

Overview

The Yiheng DU-3GW and DU-3GO are integrated constant-temperature magnetic stirring baths engineered for precision thermal control and homogeneous mixing in analytical, synthetic, and quality control laboratories. Unlike conventional standalone water or oil baths, these units combine a thermostatically regulated fluid reservoir with an embedded high-torque magnetic stirrer—enabling simultaneous temperature stabilization and mechanical agitation of reaction vessels placed within the bath. The system operates on the principle of conductive heat transfer via immersion, where temperature uniformity is maintained through internal recirculation of the bath medium (deionized water for DU-3GW; silicone or mineral oil for DU-3GO) and enhanced by forced convection induced by the rotating magnetic field. Designed for continuous operation under GLP-compliant workflows, the unit delivers stable thermal environments across its full operating range—RT+5°C to 99°C for aqueous applications, and RT+5°C to 200°C for high-temperature oil-based reactions—making it suitable for reflux, enzymatic assays, dissolution testing, and polymerization kinetics.

Key Features

• Integrated dual-function architecture: precise temperature regulation + synchronized magnetic stirring in a single compact footprint.
• 304 stainless steel heating element ensures corrosion resistance in both aqueous and organic media, extending service life and minimizing contamination risk.
• PID-based digital temperature controller with ±0.5°C stability over time and spatial distribution—validated per ASTM E2778 for laboratory bath performance.
• LCD interface supports real-time switching between bath fluid temperature and optional external probe input (e.g., immersed thermocouple in reaction flask), facilitating process correlation studies.
• High-temperature permanent magnet drive system rated for continuous operation up to 200°C without demagnetization—critical for long-duration oil-bath syntheses.
• Brushless DC motor eliminates carbon brush wear, reduces electromagnetic interference, and supports >10,000 hours of maintenance-free operation.
• Independent over-temperature safety cutoff with audible/visual alarm—compliant with IEC 61010-1 requirements for Class II laboratory equipment.
• Flame-retardant housing and ventilation-compatible design enable safe deployment inside fume hoods during volatile solvent handling.

Sample Compatibility & Compliance

The DU-3GW/DU-3GO accommodates standard laboratory glassware up to 3 L capacity—including round-bottom flasks, beakers, and jacketed reactors—without requiring external clamping mechanisms. Its open-bath geometry allows direct access for sampling, pH electrode insertion, or condenser attachment. The unit meets key regulatory expectations for routine lab instrumentation: temperature calibration traceability to NIST-certified references, electrical safety certification per CE/IEC 61010-1, and material compatibility documentation supporting USP for contact surfaces. While not intrinsically rated for hazardous area use, its sealed motor housing and low-voltage control circuitry support integration into ISO 17025-accredited testing environments when operated per manufacturer-specified ambient conditions (5–40°C, <80% RH non-condensing).

Software & Data Management

These models operate as standalone instruments with no proprietary software dependency. All operational parameters—including setpoint, actual temperature, stirring speed (indirectly inferred via magnetic coupling load), and alarm status—are accessible via front-panel LCD. For audit-trail compliance in regulated industries (e.g., pharmaceutical QC), users may connect an external data logger to the analog output port (0–5 V DC proportional to bath temperature) or integrate the unit into a LabVantage or DeltaV DCS environment using optional 4–20 mA signal conversion modules. Firmware supports GLP-style event logging: power-on timestamp, max/min temperature excursions, and over-temperature fault records stored in non-volatile memory for post-run review.

Applications

• Controlled-temperature synthesis requiring concurrent agitation (e.g., Grignard reactions, esterifications, nanoparticle precipitation).
• Dissolution testing per USP , particularly for formulations requiring oil-phase solubilization above 100°C.
• Enzyme kinetic assays demanding tight thermal control (±0.5°C) and homogeneous substrate dispersion.
• Calibration of temperature-sensitive sensors (thermistors, RTDs) against certified reference standards.
• Accelerated stability studies per ICH Q1A(R3), utilizing oil bath conditions to simulate elevated storage environments.
• Pre-heating and holding of mobile phases in HPLC preparation workflows prior to column equilibration.

FAQ

Can the DU-3GO be used with water, and vice versa?
Yes—both models share identical mechanical and control architecture; only the recommended bath medium differs. Using water in the DU-3GO above 100°C will cause boiling and pressure buildup; conversely, oil in the DU-3GW below 99°C introduces unnecessary viscosity and cleaning complexity.
Is external temperature probe connectivity supported?
Yes—the rear-panel analog output enables connection to third-party loggers or SCADA systems. Optional PT100 probe kits (sold separately) allow direct vessel-internal temperature feedback.
Does the unit comply with FDA 21 CFR Part 11 requirements?
As a non-networked, non-auditable standalone device, it does not implement electronic signatures or audit trails natively—but raw temperature data from external loggers may be incorporated into Part 11–compliant validation protocols.
What maintenance is required for long-term reliability?
Annual inspection of seal integrity, cleaning of stainless steel bath chamber with mild detergent, and verification of PID tuning parameters using a calibrated reference thermometer are recommended.
Can multiple flasks be stirred simultaneously in one bath?
Yes—provided total volume remains ≤3000 mL and magnetic coupling strength is sufficient for all stir bars (standard 30 mm × 8 mm PTFE-coated bars recommended).