Hanuo DL-40 Series Low-Temperature Circulating Chiller

Overview

The Hanuo DL-40 Series Low-Temperature Circulating Chiller is an integrated, air-cooled refrigeration system engineered for precise thermal management in laboratory and analytical environments. It employs a hermetically sealed compressor-based refrigeration cycle combined with microprocessor-driven PID temperature control to deliver stable, continuous low-temperature coolant circulation. Designed for operation down to −40 °C, the unit supplies temperature-controlled fluid—typically ethylene glycol/water or ethanol/water mixtures—to external equipment requiring active cooling or cryogenic stabilization. Its closed-loop architecture ensures consistent heat exchange without ambient air contamination, making it suitable for applications where thermal drift, condensation risk, or solvent volatility must be minimized.

Key Features

• Hermetically sealed air-cooled compressor system with multi-stage protection: compressor delay startup, overheat shutdown, and overcurrent cutoff to ensure long-term reliability under continuous duty.
• Microprocessor-based PID temperature controller with digital display, enabling setpoint resolution of 0.1 °C and real-time monitoring of bath temperature and system status.
• Integrated high-head centrifugal circulation pump delivering a constant flow rate of 15 L/min across all models—optimized for pressure stability and minimal pulsation when feeding external jackets or coils.
• Stainless steel reservoir tanks (5–50 L capacity) with insulated lid and fluid-level sensor; corrosion-resistant interior compatible with common low-temperature heat transfer fluids.
• Robust mechanical design with vibration-dampened mounting, front-accessible service panels, and IP20-rated electrical enclosure for safe operation in standard laboratory environments.
• No external water supply required—fully self-contained operation eliminates dependency on municipal chilled water infrastructure.

Sample Compatibility & Compliance

The DL-40 Series supports direct immersion of sample containers up to the maximum reservoir volume (e.g., 5 L in DL-4005, 50 L in DL-4050), enabling bath-style low-temperature experimentation. When used externally, it interfaces seamlessly with jacketed reactors, rotary evaporators, electron microscopy cold stages, mass spectrometer ion sources, and vacuum deposition systems via standard 1/2″–3/4″ NPT or BSP fittings. The unit complies with IEC 61010-1:2010 for laboratory electrical safety and meets EMC requirements per EN 61326-1:2013. While not certified for medical or pharmaceutical GMP production use, its temperature stability (±0.5 °C) and logging-capable control system support GLP-aligned experimental documentation when paired with validated external software.

Software & Data Management

The embedded controller includes RS-232 and optional RS-485 communication ports for integration into lab-wide monitoring networks. Third-party SCADA or LabVIEW-compatible drivers enable remote setpoint adjustment, real-time temperature streaming, and alarm event logging. Audit trails—including timestamped temperature deviations, compressor runtime, and fault codes—can be exported as CSV for internal quality review. For regulated environments, optional firmware upgrades support 21 CFR Part 11-compliant user access controls and electronic signature functionality when deployed with validated host software.

Applications

• Cooling condensers and receiving flasks in rotary evaporation systems operating under reduced pressure, preventing solvent vapor bypass and improving recovery yield.
• Thermal regulation of exothermic reactions in jacketed glass or stainless steel reactors, especially in low-temperature organic synthesis (e.g., Grignard, lithiation, or cryo-Heck reactions).
• Stabilizing detector temperatures in analytical instrumentation including FTIR spectrometers, Raman probes, and CCD-based fluorescence readers to reduce dark current noise.
• Providing auxiliary cooling to vacuum coating systems, electron beam evaporators, and sputtering chambers to maintain substrate temperature during thin-film deposition.
• Supporting lyophilization pre-freezing stages and cold trap condensation in freeze dryers, extending shelf life of thermolabile biologics and pharmaceutical intermediates.
• Serving as a secondary temperature reference bath for calibrating low-temperature sensors (e.g., Pt100, thermistors) per ISO/IEC 17025 traceability protocols.

FAQ

What types of heat transfer fluids are compatible with the DL-40 Series?
Ethylene glycol/water (30–50% v/v), propylene glycol/water, and ethanol/water mixtures are recommended. Avoid pure water below 0 °C or chlorinated solvents due to freezing risk and material incompatibility.
Can the chiller maintain −40 °C while delivering full flow to an external device?
Yes—each model is rated for its specified refrigeration capacity at −40 °C under continuous 15 L/min flow. Actual performance depends on external heat load, tubing insulation, and ambient temperature (rated for ≤30 °C ambient).

Is remote monitoring supported out of the box?
RS-232 serial output is standard; Modbus RTU over RS-485 and Ethernet modules are available as factory options. No proprietary software is bundled—integration requires user-supplied host applications.

How often does the system require maintenance?
Compressor oil and refrigerant levels are sealed for life under normal operation. Annual inspection of air intake filters, pump impeller integrity, and fluid pH/concentration is advised for extended service intervals.

Does the unit include drain valves and fluid level indicators?
Yes—all models feature bottom-mounted drain valves, translucent level windows with graduated markings, and low-fluid auto-shutdown protection.