Zhongke Aobo DF Series Intelligent Heating Magnetic Stirrer
| Brand | Zhongke Aobo |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | DF-101S |
| Stirring Capacity | 2 L |
| Speed Range | 0–2800 rpm |
| Temperature Control Range | Ambient to 400 °C |
| Heating Power | 500 W |
| Control System | PID-based Microprocessor Controller |
| Motor Type | Brushless DC Motor (Imported from Japan) |
| Heating Element | High-Temperature-Aged Stainless Steel Immersion Heater |
| Magnetic Coupling | High-Grade NdFeB Permanent Magnet |
| Construction | Polished 304 Stainless Steel Bath Chamber |
| Compliance | Designed for GLP-compliant lab environments |
Overview
The Zhongke Aobo DF Series Intelligent Heating Magnetic Stirrer is a precision-engineered benchtop instrument designed for simultaneous temperature-controlled heating and magnetic agitation of liquid samples in research, quality control, and routine analytical laboratories. It operates on the principle of contactless rotational coupling between an external rotating permanent magnet (driven by a brushless DC motor) and a magnetic stir bar immersed in the sample vessel. Heat is uniformly transferred via a high-stability stainless steel heating bath, enabling precise thermal management across water, oil, or silicone fluid media. Unlike basic hotplate stirrers, the DF Series integrates real-time digital speed and temperature feedback loops, delivering consistent shear input and thermal homogeneity essential for viscosity-sensitive reactions, dissolution testing, catalyst activation, and reagent synthesis protocols.
Key Features
- Brushless DC motor (Japan-sourced) ensures silent operation, minimal mechanical vibration, high torque retention up to 2800 rpm, and extended service life without carbon brush wear.
- PID microprocessor temperature controller with auto-tuning capability, ±0.5 °C typical temperature stability, and programmable over-temperature cut-off (settable threshold) for personnel and sample safety.
- High-reliability heating assembly: 304 stainless steel immersion heater aged at 800 °C for 48 hours; insulation resistance >1000 MΩ; certified dry-run safe under no-load conditions.
- Optimized magnetic drive system using sintered neodymium-iron-boron (NdFeB) magnets rated for continuous operation up to 400 °C — maintaining >95% coupling efficiency even at elevated bath temperatures.
- Electropolished 304 stainless steel heating bath (depth ≥80 mm) supports standard 100–2000 mL glassware; compatible with water, silicone oil, and heat-transfer fluids per ASTM D2878 specifications.
- Dual digital displays for independent real-time monitoring of setpoint and actual values for both speed (rpm) and temperature (°C), with adjustable resolution (1 rpm / 0.1 °C).
Sample Compatibility & Compliance
The DF-101S accommodates standard laboratory vessels including round-bottom flasks (up to 2 L), beakers, and crystallization dishes. Its uniform thermal profile meets requirements for USP dissolution apparatus auxiliary heating and ASTM E2913-22 thermal validation of mixing systems. The unit is constructed and calibrated in accordance with ISO 9001 manufacturing practices and supports laboratory adherence to GLP (Good Laboratory Practice) documentation standards. While not FDA 21 CFR Part 11–certified out-of-the-box, its digital logging interface (via optional RS-232/USB module) enables integration into validated data acquisition workflows requiring audit trails, electronic signatures, and secure parameter locking.
Software & Data Management
The DF Series includes embedded firmware supporting manual operation and preset protocol recall (up to 5 user-defined profiles). Optional PC connectivity allows remote monitoring and time-stamped data export (CSV format) of speed, temperature, and runtime parameters. Firmware versioning and calibration history are stored internally and accessible via service mode — facilitating internal metrology audits and ISO/IEC 17025 traceability reporting. All temperature sensors are PT100-class compliant, and factory calibration certificates include NIST-traceable reference points at 25 °C, 100 °C, and 300 °C.
Applications
- Controlled-temperature synthesis of metal-organic frameworks (MOFs) and nanoparticle dispersions
- Dissolution testing of pharmaceutical tablets per USP Chapter
- Preparation of homogeneous polymer solutions prior to rheological characterization
- Standardized buffer equilibration in molecular biology workflows
- Calibration verification of thermocouples and RTDs using fixed-point baths
- Accelerated stability studies requiring precise thermal ramping and agitation synergy
FAQ
What is the maximum recommended vessel size for optimal stirring efficiency?
For stable vortex formation and uniform thermal transfer, use vessels with diameter ≤80 mm and fill volume ≤1.8 L in the DF-101S configuration.
Can this unit be used for oil bath applications above 100 °C?
Yes — the bath chamber and heater are rated for continuous operation up to 400 °C; verify compatibility of your chosen heat-transfer fluid with manufacturer specifications (e.g., silicone oil grade HT-300 per DIN 51519).
Is external data logging supported without additional hardware?
No — real-time data export requires optional RS-232 or USB interface module; analog output (0–5 V) is not available on base models.
How often should temperature calibration be performed?
Per ISO/IEC 17025 guidelines, perform verification at least quarterly using a NIST-traceable reference thermometer; full recalibration is recommended annually or after physical impact or extended high-temperature cycling.
Does the stirrer maintain set speed under increasing solution viscosity?
Yes — the brushless DC motor delivers constant torque across the full 0–2800 rpm range; speed deviation remains <±2% under load up to 5000 mPa·s (measured with glycerol/water mixtures at 25 °C).
