The Great Wall DL10-1000G Recirculating Chiller

Overview

The Great Wall DL10-1000G Recirculating Chiller is an engineered thermal management solution designed for precise, stable, and continuous cooling of laboratory equipment—including rotary evaporators, spectrophotometers, ICP-MS systems, laser sources, and analytical instrumentation requiring external coolant circulation. It operates on a vapor-compression refrigeration cycle utilizing R134a—a zero-ozone-depletion-potential (ODP), low-global-warming-potential (GWP) refrigerant compliant with international environmental directives including the Montreal Protocol and EU F-Gas Regulation (EU No. 517/2014). The unit integrates a high-efficiency Embraco hermetic piston compressor, an air-cooled finned-tube condenser with oxygen-free copper spiral tubing, and a fully immersed 304 stainless steel coil evaporator housed within the reservoir—eliminating freeze-induced mechanical stress on heat exchange surfaces. Its PID-based digital temperature controller delivers reproducible setpoint accuracy within ±2 °C under defined ambient conditions (25 °C, 50–70% RH), supporting applications where thermal drift must remain within validated tolerances.

Key Features

• Hermetically sealed Embraco piston compressor for extended service life, low vibration, and consistent refrigeration performance across load cycles.
• Air-cooled condenser with proprietary intermediate expansion joint technology ensures long-term structural integrity and simplified maintenance access.
• Immersion-type 304 stainless steel evaporator eliminates risk of cracking or rupture during low-temperature operation—even when coolant viscosity increases near freezing thresholds.
• Danfoss DML-series dryer filter containing 100% 3A molecular sieve guarantees deep desiccation and acid scavenging, preserving refrigerant purity and system longevity.
• Imported high-pressure vane circulation pump provides stable flow (7 L/min nominal) with adjustable discharge pressure (1–10 bar), enabling compatibility with high-backpressure lab setups such as jacketed reactors or multi-point distribution manifolds.
• Dual-stage filtration: stainless steel mesh at fill port + inline cartridge filter at reservoir outlet—prevents particulate ingress into sensitive downstream instruments.
• Real-time monitoring via front-panel analog pressure gauge and calibrated transparent liquid level sight tube, facilitating proactive maintenance and operational transparency.
• Comprehensive safety architecture includes compressor soft-start delay (preventing inrush current damage), high-pressure cut-off switch, motor overload relay, and electronic overcurrent protection aligned with IEC 61000-4-5 surge immunity requirements.

Sample Compatibility & Compliance

The DL10-1000G is compatible with standard aqueous and organic heat transfer fluids—including water, 30% ethylene glycol/water mixtures, and silicone oils—within its specified operating range (–10 °C to 25 °C). Its SUS304 reservoir and wetted components meet ASTM A240/A240M standards for corrosion resistance in mildly aggressive chemical environments. While not certified to UL/CSA or CE for medical device integration, the chiller complies with GB/T 10870–2014 (Chinese national standard for liquid chillers) and satisfies general-purpose laboratory safety requirements per ISO/IEC 17025:2017 Annex A.3.3 for auxiliary equipment used in accredited testing laboratories. Its R134a charge adheres to EPA SNAP Program guidelines for acceptable substitutes in laboratory refrigeration applications.

Software & Data Management

This model features a standalone digital controller with LED display and tactile membrane keypad—designed for robustness and minimal firmware dependency. It does not include network connectivity, USB data logging, or remote protocol support (e.g., Modbus, Ethernet/IP). Temperature setpoints, real-time readings, and status indicators (e.g., “ALARM”, “RUN”) are displayed locally. For users requiring audit-trail-capable documentation, manual recording of setpoint changes and operational logs is recommended to satisfy GLP/GMP traceability expectations. The absence of embedded software eliminates cybersecurity exposure vectors common in IoT-enabled chillers—making it suitable for secure, air-gapped laboratory infrastructures.

Applications

• Cooling jackets of rotary evaporators and falling-film concentrators in pharmaceutical process development.
• Thermal stabilization of UV-Vis, FTIR, and fluorescence spectrometers during extended acquisition sequences.
• Heat removal from high-power diode lasers and optical parametric oscillators in photonics research.
• Temperature control of sample cells in rheometry, calorimetry, and dynamic light scattering systems.
• Supporting cryogenic pre-cooling stages in preparative chromatography and supercritical fluid extraction workflows.
• General-purpose benchtop cooling for vacuum pumps, mass spectrometer ion sources, and X-ray diffraction detectors.

FAQ

What is the maximum allowable ambient temperature for continuous operation?
The unit is rated for continuous duty between 5 °C and 35 °C ambient. Operation above 35 °C may reduce cooling capacity and trigger thermal overload protection.
Can this chiller be used with flammable solvents as coolant?
No. The DL10-1000G is not explosion-proof and is intended only for non-flammable, non-toxic heat transfer media. Use of flammable coolants voids warranty and violates IEC 60079-0 intrinsic safety provisions.
Is the reservoir volume sufficient for external loop priming?
Yes—the 10 L stainless steel reservoir accommodates typical closed-loop volumes up to ~8 L, accounting for system dead volume and thermal expansion margin.
Does the unit support external temperature feedback control?
No. The PID controller regulates only internal reservoir temperature; it does not accept external PT100 inputs or support cascade control loops.
What maintenance intervals are recommended?
Inspect filters quarterly; replace dryer filter every 24 months or after refrigerant recovery/recharge. Verify refrigerant charge and compressor oil condition annually per GB/T 10870 maintenance schedule.