Yiheng DU-30G Digital Oil Bath with Magnetic Stirring

Overview

The Yiheng DU-30G Digital Oil Bath with Magnetic Stirring is an integrated constant-temperature heating platform engineered for precision thermal control and homogeneous sample agitation in analytical, synthetic, and quality control laboratories. Designed around a robust stainless-steel bath chamber and a high-torque magnetic stirring system, it operates on the principle of conductive heat transfer via thermally stable silicone oil or other compatible heat-transfer media. Unlike water baths limited to 100°C, the DU-30G extends operational range up to 200°C—enabling applications such as polymerization reactions, solvent reflux, enzyme kinetics at elevated temperatures, and calibration of temperature-sensitive sensors. Its microprocessor-based PID temperature controller ensures thermal stability within ±0.3°C across the full range (RT+20°C to 200°C), while real-time digital display and programmable timer functionality support unattended operation under GLP-compliant workflows.

Key Features

• Microprocessor-controlled PID temperature regulation with ±0.3°C accuracy and adjustable timer (up to 99 hours 59 minutes)
• Stainless-steel inner tank and outer casing—resistant to corrosion from oils, solvents, and cleaning agents; fully cleanable and compliant with ISO 15190 laboratory safety standards
• Dual-safety over-temperature protection: independent mechanical thermostat + electronic cut-off with audible/visual alarm
• High-torque magnetic stirring system (0–1200 rpm, digitally adjustable) with closed-loop speed feedback to maintain consistent rotation despite viscosity fluctuations
• Modular bath insert design: interchangeable perforated plates accommodate various vessel diameters (e.g., 50–100 mm), supporting beakers, flasks, and reaction tubes without adapter kits
• Internal circulation mechanism enhances thermal homogeneity—measured radial temperature deviation <±0.5°C at 150°C in standard silicone oil (20 L fill)

Sample Compatibility & Compliance

The DU-30G accommodates standard laboratory glassware including borosilicate beakers (50–1000 mL), round-bottom flasks, and jacketed reactors. It supports both low-viscosity mineral oils and high-stability silicone oils (e.g., Dow Corning PMX-200 series) with flash points >250°C. The unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets CE marking requirements for electromagnetic compatibility (EMC Directive 2014/30/EU). Its sealed electronics and drip-proof control panel satisfy IP20 environmental rating. While not intrinsically safe for explosive atmospheres, it is suitable for use in general-purpose chemical labs operating under OSHA 1910.1200 and CLP Regulation guidelines.

Software & Data Management

The DU-30G operates as a standalone instrument with no proprietary software dependency. All parameters—including setpoint, actual temperature, stirring speed, and elapsed time—are displayed on a dual-line LED interface. For traceability in regulated environments (e.g., pharmaceutical QC per USP or ISO/IEC 17025), users may integrate external data loggers via RS-232 or analog 0–5 V output (optional accessory). Audit trails can be maintained manually or through third-party SCADA systems supporting Modbus RTU protocol. The device supports 21 CFR Part 11–compliant validation when paired with validated logging hardware and documented SOPs.

Applications

• Controlled-temperature synthesis of metal-organic frameworks (MOFs) and nanomaterials requiring prolonged heating above 100°C
• Viscosity-temperature profiling of lubricants and resins per ASTM D445 and ISO 3104
• Enzymatic assays at non-ambient temperatures (e.g., thermostable polymerases at 65–75°C)
• Calibration of platinum resistance thermometers (PRTs) and thermocouples against NIST-traceable references
• Accelerated stability testing of pharmaceutical formulations per ICH Q1A(R2)
• Preheating and holding samples prior to HPLC injection or FTIR analysis

FAQ

Can the DU-30G be used as a water bath?
Yes—it functions reliably as a water bath up to 99°C, though stainless-steel construction and high-temp insulation make it especially suited for oil-based applications.
Is external cooling capability available?
No—the DU-30G is heating-only; for sub-ambient control, consider Yiheng’s low-temperature circulators (e.g., DC-0506 series) or hybrid chiller-bath configurations.
What is the maximum recommended oil volume?
The 20 L bath chamber is rated for fill levels between 12–18 L to ensure optimal thermal response and stirring efficiency.
Does the magnetic stirrer work with Teflon-coated stir bars only?
Standard ferrite or samarium-cobalt stir bars are compatible; however, PTFE-encapsulated bars are strongly recommended for chemical inertness and longevity in aggressive media.
How often should the temperature sensor be calibrated?
Annual calibration against a certified reference thermometer (e.g., Fluke 1523 with 0.02°C uncertainty) is advised for ISO/IEC 17025 compliance; verification checks should occur before critical experiments.