Yiheng DU-/DU-G Series Electric Heating Constant-Temperature Oil Bath with Magnetic Stirring

Overview

The Yiheng DU-/DU-G Series Electric Heating Constant-Temperature Oil Bath with Magnetic Stirring is a precision thermal platform engineered for stable, uniform heating of samples immersed in oil or high-boiling-point solvents. Operating on resistive heating principles with PID-regulated thermal feedback, this bath delivers consistent temperature maintenance across its operational range (RT+20 °C to 200 °C), making it suitable for applications requiring elevated thermal stability beyond the limits of standard water baths. Unlike circulating baths, the DU-/DU-G series relies on passive convection and integrated magnetic stirring to achieve thermal homogeneity—eliminating the need for external pumps while minimizing mechanical complexity and maintenance requirements. Its robust stainless-steel construction ensures long-term resistance to corrosion from organic solvents, mineral oils, and glycols commonly used in synthetic chemistry, polymer processing, and materials testing.

Key Features

• Microprocessor-based PID temperature controller with digital display, adjustable setpoint resolution of 0.1 °C, and programmable timer (up to 99 hours 59 minutes) for unattended operation.
• Double-layer stainless-steel tank (inner and outer chamber) provides structural integrity, chemical resistance, and thermal insulation; removable perforated plate allows flexible positioning and size adjustment of vessel openings to accommodate various flask diameters.
• Independent over-temperature protection circuit with audible and visual alarm triggers when internal bath temperature exceeds user-defined safety threshold—preventing sample degradation or thermal runaway.
• Dedicated magnetic stirrer motor with closed-loop speed regulation maintains constant rotational output (0–1200 rpm, depending on model) regardless of increasing medium viscosity during reaction progression—critical for homogeneous heat transfer in viscous oils or polymer melts.
• High-torque stirring system ensures effective mixing even under high-viscosity conditions (up to 10,000 mPa·s), promoting radial and axial thermal equilibration throughout the bath volume.

Sample Compatibility & Compliance

The DU-/DU-G series accommodates standard laboratory glassware including round-bottom flasks (50–2000 mL), beakers, and reaction vessels up to 200 mm in diameter. Its non-circulating design complies with ISO/IEC 17025:2017 requirements for equipment used in calibration and testing laboratories where traceability of thermal performance is required. While not certified to GLP or GMP standards out-of-the-box, the unit supports audit-ready documentation through optional data logging interfaces (RS-232 or USB, available upon request). All electrical components meet IEC 61010-1 safety standards for laboratory equipment, and the stainless-steel housing conforms to ASTM A240 for corrosion-resistant austenitic alloys.

Software & Data Management

The built-in controller does not include proprietary software but supports analog voltage output (0–5 V DC) proportional to measured temperature for integration with third-party data acquisition systems (e.g., LabVIEW, MATLAB, or custom SCADA platforms). Optional external loggers can record temperature and stirring speed at user-defined intervals (1 s to 60 min), generating CSV-formatted files compatible with Excel, Origin, or statistical process control (SPC) tools. For regulated environments, the system may be validated per IQ/OQ protocols using calibrated reference thermometers (e.g., Fluke 1523/1524) and NIST-traceable RTD probes.

Applications

• Controlled-temperature synthesis of organometallic compounds and Grignard reagents requiring inert oil-phase heating above 100 °C.
• Viscosity-temperature profiling of lubricants, bitumen, and thermoplastic elastomers using ASTM D445 or ISO 3104 methodologies.
• Accelerated aging studies per ASTM D5722 for polymer stability evaluation under sustained thermal stress.
• Enzymatic assay incubation at elevated temperatures where aqueous media would evaporate or decompose.
• Calibration of temperature-sensitive sensors and transducers in metrology labs operating within Class II thermal stability criteria (±0.5 °C).

FAQ

Is the bath compatible with silicone oil, mineral oil, and ethylene glycol mixtures?
Yes—the stainless-steel tank and heater elements are chemically resistant to common high-temperature heat transfer fluids. Avoid halogenated or strongly oxidizing media.
Can the stirring function operate independently of heating?
Yes—stirring speed is controlled separately via dedicated knob or keypad input, enabling mechanical agitation without thermal activation.
What is the maximum recommended fill level for optimal thermal uniformity?
Maintain fluid level between 3 cm below the top rim and at least 2 cm above the heater element to ensure full immersion and prevent dry-run damage.
Does the unit support external temperature probe input for sample-specific control?
No—the system uses an internal PT100 sensor located near the heater. For sample-core temperature feedback, users must integrate an external PID controller with dual-sensor capability.
Are replacement parts such as stir bars, perforated plates, or heaters available separately?
Yes—Yiheng supplies OEM-certified spare parts including PTFE-coated stir bars (diameters 15–40 mm), stainless-steel bath inserts, and modular heating assemblies under part numbers aligned with DU-/DU-G model variants.