Hanuo DL-Series Low-Temperature Circulating Chillers
| Brand | Hanuo |
|---|---|
| Model Series | DL-10°C and DL-15°C |
| Cooling Method | Air-Cooled |
| Temperature Range | −10 °C or −15 °C |
| Temperature Stability | ±0.5 °C |
| Refrigeration Capacity | 300–3000 W |
| Reservoir Volume | 5–50 L |
| Pump Flow Rate | 15 L/min |
| Pump Pressure | 0 bar (low-head circulation) |
| Origin | Shanghai, China |
Overview
The Hanuo DL-Series Low-Temperature Circulating Chillers are engineered for precision thermal management in laboratory environments requiring stable sub-ambient temperature control. These integrated air-cooled chillers utilize hermetically sealed compressors and microprocessor-based PID temperature regulation to deliver consistent low-temperature coolant circulation—typically ethylene glycol/water mixtures—at setpoints of either −10 °C or −15 °C. Designed for direct integration with heat-generating analytical and process equipment, the DL-Series provides reliable heat extraction via external recirculation loops while simultaneously enabling bath-style low-temperature experimentation within the reservoir itself. The system operates continuously under steady-state conditions, supporting long-duration applications such as rotary evaporation, cryo-chemical synthesis, vacuum deposition, and低温 spectroscopy without thermal drift beyond ±0.5 °C.
Key Features
- Air-cooled, fully enclosed compressor refrigeration system with intelligent microcontroller-based start-up sequencing and adaptive load compensation
- Multi-layer safety protection including compressor delay startup (≥3 min), high-pressure cut-off, overcurrent trip, and thermal overload monitoring
- Stainless steel reservoir with calibrated volume markings (5 L to 50 L options), corrosion-resistant internal wetted parts, and insulated lid for minimized ambient heat ingress
- Low-noise, brushless DC circulation pump delivering a constant flow rate of 15 L/min at minimal backpressure—optimized for compatibility with capillary tubing, jacketed reactors, and condenser coils
- Real-time digital display showing actual/reserved temperature, system status, and fault codes; intuitive keypad navigation with password-protected parameter modification
- Robust structural design with anti-slip rubber feet, recessed cable management, and IP20-rated electrical enclosure compliant with IEC 61000-6-3 for laboratory electromagnetic compatibility
Sample Compatibility & Compliance
The DL-Series is compatible with standard laboratory coolants—including 30%–50% aqueous ethylene glycol solutions—and supports direct connection to common instruments such as rotary evaporators (e.g., Buchi R-300), jacketed glass reactors (e.g., ChemGlass series), electron microscopy cooling stages, and vacuum coaters. All units comply with GB/T 20438 (Chinese national standard for electrical safety of laboratory equipment) and meet CE marking requirements under the EU Machinery Directive 2006/42/EC and Low Voltage Directive 2014/35/EU. While not certified to UL 61010-1 or FDA 21 CFR Part 11 out-of-the-box, the chiller’s deterministic temperature control architecture and non-volatile error logging support integration into GLP/GMP workflows when paired with validated external data acquisition systems.
Software & Data Management
The DL-Series operates autonomously via embedded firmware with no proprietary PC software dependency. Temperature setpoints, run-time counters, and alarm history (last 10 events) are retained in non-volatile memory during power loss. Optional RS485 Modbus RTU interface (available on DL-1030 and larger models) enables integration with SCADA platforms or building management systems for remote monitoring and scheduled operation. All units support analog 0–5 V or 4–20 mA output signals for external temperature feedback logging, facilitating traceable calibration records per ISO/IEC 17025 Clause 6.4.2.
Applications
- Cooling condensers and cold traps in rotary evaporation systems to maximize solvent recovery efficiency at reduced pressure
- Maintaining precise thermal conditions in jacketed bioreactors and fermentation vessels during exothermic microbial cultivation
- Thermal stabilization of high-resolution electron optical columns and cryo-SEM specimen stages
- Providing secondary low-temperature baths for reaction calorimetry, crystallization studies, and low-T NMR sample pre-cooling
- Supporting vacuum metallization processes by stabilizing substrate temperature during thin-film deposition
- Enabling controlled freeze-drying cycles in pilot-scale lyophilizers through synchronized shelf-cooling profiles
FAQ
What coolant fluids are recommended for use with the DL-Series?
Aqueous solutions of ethylene glycol (30–50% v/v) are strongly recommended to prevent freezing and inhibit microbial growth. Pure water is not advised below 0 °C due to risk of ice formation and pump cavitation.
Can the chiller operate unattended overnight?
Yes—continuous operation mode is factory-enabled, and all safety interlocks remain active during extended runtime. Ambient temperature must remain ≤32 °C and relative humidity <80% RH non-condensing.
Is external temperature feedback supported?
Standard models accept external Pt100 sensor input for dual-point control (bath + process); this feature requires configuration via service menu and is available on DL-1015 and above.
What maintenance intervals are required?
Compressor oil and refrigerant charge require inspection every 24 months under normal lab use; air filter cleaning is recommended quarterly. No routine refrigerant topping is needed under sealed-system operation.
How is temperature uniformity verified across the reservoir?
Uniformity is validated per ASTM E742-20 Annex A1 using three calibrated PT100 probes placed at top/mid/bottom positions; typical deviation is ≤0.3 °C at steady state.
