Hanuo DL-1050 Low-Temperature Circulating Chiller

Overview

The Hanuo DL-1050 Low-Temperature Circulating Chiller is an integrated, air-cooled refrigeration system engineered for precise temperature control and stable fluid circulation in laboratory and pilot-scale applications. It operates on the principle of vapor-compression refrigeration using a hermetically sealed compressor and environmentally compliant R404A or R507 refrigerant (model-dependent), delivering consistent cooling capacity across its operational range of –10 °C to +30 °C. Unlike water-cooled chillers, the DL-1050 eliminates dependency on external cooling towers or facility water supply—making it ideal for laboratories with limited infrastructure or variable ambient conditions. Its primary function is to supply temperature-stabilized coolant (typically 30–50% ethylene glycol/water mixture) to external equipment such as rotary evaporators, spectrophotometers, NMR preamplifiers, laser sources, and reaction calorimeters—enabling thermal management, condensation control, and process temperature stabilization.

Key Features

• Stainless steel reservoir and wetted components (304 SS) ensure corrosion resistance, low-temperature embrittlement immunity, and compatibility with common organic solvents and aqueous coolants.
• Large open-bath design (50 L capacity) supports direct immersion of probes or auxiliary vessels while enabling simultaneous internal temperature control and external circulation.
• Microprocessor-based PID controller with digital display offers real-time monitoring of bath temperature, outlet temperature, flow status, and system fault diagnostics—including high-pressure cut-off, low-flow alarm, and over-temperature protection.
• High-efficiency centrifugal circulation pump delivers up to 15 L/min at 1 bar pressure, optimized for low backpressure systems and compatible with tubing diameters ≥10 mm (ID).
• Air-cooled condenser with axial fan and finned-tube heat exchanger ensures reliable operation in ambient temperatures up to 35 °C without performance derating.
• Continuous-duty rated motor and compressor architecture support unattended 24/7 operation under steady-state thermal load conditions.

Sample Compatibility & Compliance

The DL-1050 is designed for use with non-aggressive heat transfer fluids, including deionized water, 30–50% ethylene glycol/water mixtures, and silicone oils (viscosity ≤50 cSt). It is not intended for use with flammable, highly corrosive, or particulate-laden fluids. The unit complies with IEC 61000-6-3 (EMC Emission Standard) and IEC 61000-6-2 (Immunity Standard), and meets CE marking requirements for electrical safety (EN 61010-1). While not certified to UL or CSA standards out-of-the-box, its control architecture supports integration into GLP/GMP environments through configurable audit trails (via optional RS485/Modbus RTU interface) and manual logbook documentation of setpoint changes and maintenance events.

Software & Data Management

The DL-1050 operates via a local front-panel interface with tactile keypad and 4-digit LED display. No proprietary software is bundled; however, the optional RS485 communication port enables integration with third-party SCADA, LabVIEW, or PLC-based monitoring systems using standard Modbus RTU protocol. Temperature logging requires external data acquisition hardware—no onboard memory or USB export is provided. For regulatory workflows requiring electronic records, users may implement external validation protocols aligned with FDA 21 CFR Part 11 when paired with compliant DAQ platforms and controlled access procedures.

Applications

• Condenser cooling for rotary evaporation and short-path distillation systems.
• Thermal regulation of analytical instruments including HPLC column ovens, FTIR detectors, and mass spectrometer ion sources.
• Temperature stabilization of laser diodes, optical benches, and photomultiplier tube housings.
• Reaction temperature control in jacketed glass reactors and calorimetric setups.
• Calibration traceability support for thermocouple and RTD verification baths operating within its stability envelope (±0.5 °C).
• Supporting ASTM D2891 (viscosity measurement), ISO 17025-compliant thermal testing, and USP environmental monitoring where auxiliary cooling is required.

FAQ

What is the minimum recommended coolant concentration for sub-zero operation?
A 30% ethylene glycol/water mixture is validated for stable operation down to –10 °C. For extended low-temperature use (e.g., –20 °C), a 45–50% mixture is required to prevent freezing and maintain pump priming.

Can the DL-1050 be used with dry ice or liquid nitrogen loops?
No. This unit is a mechanical refrigeration system only and must not be connected to cryogenic fluid manifolds or secondary refrigerant loops.

Is the reservoir insulated?
Yes—the stainless steel tank is fully jacketed with closed-cell polyurethane foam insulation (25 mm thickness) to minimize ambient heat ingress and improve energy efficiency at low setpoints.

What maintenance intervals are recommended?
Compressor oil and refrigerant levels require verification every 24 months under continuous operation; air filter cleaning is advised quarterly; and coolant replacement is recommended annually or per fluid manufacturer specifications.

Does the unit include a built-in filtration system?
No. External inline particulate filters (≤5 µm rating) are strongly recommended when circulating reclaimed or long-term coolant to protect pump bearings and heat exchanger passages.