CZGY DF-2 Integrated Heating Magnetic Stirrer
| Brand | CZGY |
|---|---|
| Origin | Jiangsu, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Domestic |
| Model | DF-2 |
| Instrument Type | Magnetic Stirrer |
| Maximum Stirring Volume | 2000 mL |
| Speed Range | 0–2500 rpm |
| Temperature Control Range | Ambient to 300 °C |
Overview
The CZGY DF-2 Integrated Heating Magnetic Stirrer is an engineered laboratory workhorse designed for simultaneous precise temperature control and homogeneous mixing of liquid samples in open-vessel configurations. Built upon the Couette flow principle—where rotational torque from a rotating magnetic field drives a PTFE-coated stir bar within a stationary vessel—the instrument delivers consistent shear input while maintaining thermal uniformity across the sample volume. Its integrated heating element (960 W resistive coil embedded beneath a stainless-steel heating bath) enables rapid thermal response and stable setpoint maintenance, making it suitable for applications requiring controlled thermal activation alongside agitation—such as dissolution testing, catalyst synthesis, polymerization initiation, and buffer equilibration. Unlike standalone hotplates or external heating mantles, the DF-2’s monolithic bath design eliminates thermal lag between heating and stirring zones, ensuring high reproducibility in time-sensitive kinetic studies.
Key Features
- Integrated dual-function architecture: Simultaneous magnetic stirring and direct-contact conductive heating via a seamless 304 stainless-steel bath
- Wide operational envelope: 0–2500 rpm continuous speed control with smooth analog adjustment; ambient-to-300 °C digital temperature regulation with ±1 °C typical stability at steady state
- Digital PID temperature controller with full parameter access: Adjustable proportional band (1–200 °C), integral time (0–999 s), derivative time (0–999 s), cycle period (1–200 s), and sensor offset correction (±50 °C)
- Comprehensive safety logic: Over-temperature alarm (AL), output hysteresis (HY) to suppress relay chatter, and automatic lockout when sensor fault is detected (HHH/LLL display codes)
- Robust mechanical construction: Non-slip rubber feet, reinforced bath rim, and sealed electronics compartment compliant with IP20 environmental rating
- Noise-optimized drive system: Brushless coupling and balanced rotor assembly ensure operation below 45 dB(A) at mid-range speeds
Sample Compatibility & Compliance
The DF-2 accommodates standard laboratory glassware—including beakers (up to 2000 mL), Erlenmeyer flasks, and round-bottom flasks—when placed directly into the heating bath. Compatibility extends to common solvents (water, ethanol, ethylene glycol, silicone oil) and low-viscosity reaction media (< 500 mPa·s). The unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets EMC requirements per CISPR 11 Group 1, Class B. While not certified for hazardous location use (e.g., ATEX or IECEx), its grounded chassis and thermal cutoff fuse support safe operation under GLP-aligned lab practices. Sensor interface supports K-type thermocouples only; users must verify thermocouple calibration traceability against NIST-traceable references prior to critical experiments.
Software & Data Management
The DF-2 operates as a stand-alone analog-digital hybrid instrument with no native PC connectivity or data logging capability. All operational parameters—including setpoints, alarms, and PID coefficients—are configured locally via front-panel push-button interface and 4-digit LED display. Audit trail functionality is not implemented; however, the LCK parameter (0/1/2) permits selective locking of configuration menus to prevent inadvertent changes during routine use—a feature aligned with basic SOP enforcement in regulated environments. For labs requiring electronic records, external USB data loggers with thermocouple inputs (e.g., Omega OM-DAQPRO-5300) may be deployed in parallel, provided validation protocols document synchronization accuracy and measurement uncertainty contributions.
Applications
- Kinetic studies requiring synchronized heating and mixing: hydrolysis, esterification, and enzymatic reactions
- Preparation of homogeneous calibration standards and reference solutions in analytical chemistry workflows
- Heating and stirring of viscous media in pharmaceutical excipient development (e.g., methylcellulose gels)
- Supporting ASTM D2196 (viscosity of paints) and ISO 2555 (resin solution viscosity) sample conditioning steps
- Pre-equilibration of mobile phase solvents in HPLC method development
- Controlled evaporation trials in solvent recovery optimization
FAQ
What is the maximum recommended continuous operating time at full speed and temperature?
At 2500 rpm and ≥250 °C, continuous operation should not exceed 4 hours. For extended runs (>8 h), maintain speed ≤1200 rpm and temperature ≤180 °C.
Can the DF-2 be used with corrosive media such as concentrated acids?
Only if contained within chemically resistant vessels (e.g., PTFE-lined beakers); direct contact of aggressive liquids with the stainless-steel bath surface will cause pitting and void the warranty.
Is the temperature sensor calibrated at the factory, and how often should it be recalibrated?
Each unit ships with a K-type thermocouple verified at 100 °C (boiling water) and 25 °C (ambient). Recalibration is recommended before each critical experiment series or quarterly—whichever occurs first—using traceable reference standards.
Does the DF-2 meet FDA 21 CFR Part 11 requirements for electronic records?
No. It lacks audit trail, electronic signature, and secure data export features required under Part 11. It may be used in non-GxP contexts or as ancillary equipment under documented risk assessment.
What maintenance is required to ensure long-term performance?
Wipe the bath surface after each use; inspect stir bar integrity weekly; clean ventilation slots monthly; verify grounding continuity annually using a calibrated earth bond tester.
