CZGY GY-DFY-30L Low-Temperature Constant-Temperature Reaction Bath

Overview

The CZGY GY-DFY-30L Low-Temperature Constant-Temperature Reaction Bath is a precision-engineered circulating temperature control system designed for laboratory-scale thermal management of chemical, biological, and material science applications. Operating on a dual-mode thermoregulation principle—combining resistive heating and vapor-compression refrigeration—the unit maintains stable setpoint temperatures across a broad operational range (0–100 °C) without external coolant or cryogenic media. Its integrated internal circulation pump ensures uniform thermal distribution within the 30 L working volume, minimizing axial and radial temperature gradients to support reproducible reaction kinetics, solvent reflux, cold trapping, and sample conditioning protocols. The bath is not intended for direct immersion of sealed vessels requiring pressure-rated containment; rather, it serves as a passive thermal interface for jacketed reactors, condensers, probes, and sensor calibration fixtures.

Key Features

• Robust 304 stainless steel inner tank with welded seams and electropolished finish—resistant to corrosion from aqueous, mildly acidic, and organic solvent environments
• Powder-coated cold-rolled steel outer housing for mechanical durability and long-term structural integrity in shared lab environments
• Intelligent microprocessor-based controller with high-contrast LCD display and intuitive keypad navigation for precise setpoint entry and real-time monitoring
• PT100 platinum resistance thermometer with solid-state output—providing traceable, linear response across the full temperature span and enabling NIST-traceable calibration verification
• Dual-stage thermal regulation: 2000 W resistive heating element paired with a 260 W hermetic compressor system for rapid cooldown and stable hold performance
• Internal recirculation loop with non-cavitation centrifugal pump—designed for continuous operation at low flow impedance and minimal acoustic emission
• No external chiller or dry ice dependency—self-contained operation reduces infrastructure requirements and improves workflow continuity

Sample Compatibility & Compliance

The GY-DFY-30L accommodates standard laboratory glassware including 1–5 L jacketed flasks, condenser assemblies, probe housings, and calibration standards. Its open-bath geometry supports custom fixture integration (e.g., stirrer shafts, thermocouple ports, inert gas inlets) via user-supplied adapters. While not certified to ISO/IEC 17025 or ASTM E2877 for metrological validation out-of-the-box, the instrument’s PT100 sensor and digital controller architecture permit third-party calibration documentation per GLP/GMP-aligned SOPs. It complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets CE marking requirements for EMC immunity (EN 61326-1) and low-voltage directive (2014/35/EU). No FDA 21 CFR Part 11 functionality is embedded; however, raw temperature logs may be exported manually for audit trail reconstruction.

Software & Data Management

The GY-DFY-30L operates via standalone embedded firmware—no proprietary software installation or driver dependencies are required. Real-time temperature values, setpoint status, and fault codes (e.g., overtemperature, low fluid level, compressor lockout) are displayed continuously. While RS232 or USB data logging interfaces are not included in the base configuration, analog voltage output (0–5 V or 4–20 mA) can be added via optional OEM modules for integration into SCADA or LabVIEW-based acquisition systems. All parameter changes are recorded in non-volatile memory with timestamped event logging accessible via front-panel menu navigation—supporting basic traceability for internal quality reviews.

Applications

• Controlled-rate cooling of exothermic reactions in synthetic organic chemistry workflows
• Stabilization of enzymatic assays and protein purification buffers at sub-ambient temperatures
• Thermal preconditioning of polymer samples prior to DSC or rheological characterization
• Calibration of thermistors, RTDs, and infrared pyrometers against a stable thermal reference field
• Condenser jacketing during rotary evaporation of heat-sensitive natural product extracts
• Long-duration stability testing of pharmaceutical intermediates under isothermal storage conditions
• Supporting ASTM D97 (pour point), D2500 (cloud point), and ISO 3016 test methods requiring precise bath temperature control

FAQ

Does the GY-DFY-30L support external temperature feedback control?
No—this model implements only internal PT100 sensing. External probe input or cascade control loops require aftermarket controller retrofitting.
Can the bath operate continuously at 0 °C ambient temperature?
Yes, provided ambient humidity remains below 65% RH and ventilation clearance exceeds 15 cm on all sides to prevent compressor overheating.
Is the stainless steel tank suitable for use with acetone or chloroform?
304 stainless steel exhibits good resistance to short-term exposure; however, prolonged contact with halogenated solvents is not recommended without supplemental corrosion inhibitors or secondary containment.
What maintenance intervals are advised for the refrigeration system?
Compressor oil and refrigerant charge do not require servicing under normal operation; annual inspection of condenser coil cleanliness and fan function is recommended.
Can the unit be used with glycol-water mixtures instead of deionized water?
Yes—up to 30% propylene glycol by volume is compatible; viscosity increase must be accounted for in pump head calculations and temperature uniformity validation.