Hanuo DL-2005 Integrated Low-Temperature Circulating Chiller

Overview

The Hanuo DL-2005 Integrated Low-Temperature Circulating Chiller is an air-cooled, compressor-based thermal management system engineered for precise and stable temperature control in laboratory and pilot-scale applications. It operates on the principle of vapor-compression refrigeration, utilizing a hermetically sealed rotary compressor, copper-aluminum finned condenser, and capillary tube expansion device to deliver consistent low-temperature coolant circulation. Designed for continuous-duty operation, the unit maintains setpoint temperatures between −20 °C and ambient (typically 25 °C) with high reproducibility—critical for applications requiring thermal stabilization of analytical instruments, reaction vessels, or vacuum systems. Its integrated architecture eliminates external pump interconnections, reducing installation complexity and minimizing risk of leakage or flow mismatch. The chiller’s stainless steel reservoir and bath surface ensure chemical compatibility with common coolants—including water, water/ethylene glycol mixtures, and low-viscosity silicone oils—while supporting both internal temperature regulation and external recirculation via dedicated inlet/outlet ports.

Key Features

• Hermetically sealed air-cooled compressor system with thermal overload, high-pressure, and current-limiting protection circuits—ensuring long-term reliability under sustained load.
• Microprocessor-controlled PID temperature regulation with 0.1 °C digital resolution and real-time setpoint adjustment; supports ramp-and-soak programming via front-panel interface.
• 5-liter open-bath stainless steel reservoir with integrated circulation pump delivering 15 L/min at 4 m maximum head—optimized for low-backpressure external loops.
• Corrosion-resistant 304 stainless steel inner tank and work surface, compliant with ISO 8502-3 for surface cleanliness and compatible with aqueous and mildly organic coolant formulations.
• No external refrigerant handling required; pre-charged R134a refrigerant system meets EN 378-1 safety standards for stationary refrigeration equipment.

Sample Compatibility & Compliance

The DL-2005 is routinely deployed in environments governed by GLP and GMP frameworks, particularly where instrument cooling integrity impacts data validity—e.g., HPLC column ovens, FTIR spectrometer detectors, and laser cavity chillers. Its temperature stability (±0.5 °C) satisfies ASTM E29–23 requirements for controlled-temperature apparatus used in calibration laboratories. While not certified to IEC 61000-6-3 for EMC emissions, the unit incorporates EMI-suppressed power supply and grounded chassis design to minimize electromagnetic interference in shared instrumentation racks. All electrical components comply with GB 4706.1–2005 (equivalent to IEC 60335-1), and mechanical construction adheres to ISO 12100:2010 for machinery safety principles.

Software & Data Management

The DL-2005 operates as a standalone instrument with no proprietary software dependency. Temperature setpoints, real-time bath readings, and alarm status are displayed locally via a 4-digit LED interface. For integration into centralized lab monitoring systems, optional RS485 Modbus RTU output (available via accessory module) enables read-only access to temperature, compressor status, and fault codes—supporting audit-trail logging per FDA 21 CFR Part 11 when paired with validated SCADA platforms. No internal data storage or user-accessible firmware updates are provided; configuration remains hardware-limited to prevent unauthorized parameter modification—a design choice aligned with ISO/IEC 17025:2017 clause 6.4.8 on equipment integrity.

Applications

• Thermal stabilization of high-resolution NMR probe preamplifiers and cryogen-free magnet cooling jackets.
• Condenser cooling in rotary evaporation systems operating below ambient dew point.
• Temperature control of photomultiplier tubes (PMTs) and CCD detectors in fluorescence and chemiluminescence analyzers.
• Process cooling for small-scale jacketed reactors in pharmaceutical process development (ICH Q5C).
• Calibration bath support for thermocouple and RTD verification across −20 °C to 30 °C range per ISO/IEC 17025 Clause 6.6.

FAQ

What coolant fluids are compatible with the DL-2005?
Deionized water, 30%–50% ethylene glycol/water blends, and low-viscosity silicone oils (e.g., DC200 series, ≤50 cSt) are suitable. Avoid chlorinated solvents, acetone, or high-concentration methanol due to seal compatibility risks.
Can the unit maintain −20 °C in a 35 °C ambient environment?
Yes—its 300 W refrigeration capacity at ΔT = 55 K (−20 °C vs. 35 °C ambient) meets nominal specification under ISO 5149-2 test conditions; actual performance depends on insulation of external loop tubing and heat load.
Is the circulation pump self-priming?
No—the pump requires initial manual priming; the system lacks dry-run protection and must remain filled above minimum level mark during operation.
Does the chiller support external temperature feedback control?
Not natively. The PID controller regulates only bath temperature; external sensor input requires third-party PLC integration via analog voltage output (0–10 VDC) option kit.
What maintenance intervals are recommended?
Compressor oil inspection every 24 months; condenser coil cleaning quarterly in dusty environments; coolant replacement annually or per fluid manufacturer guidelines.