Great Wall DL10-3000G Circulating Chiller

Overview

The Great Wall DL10-3000G Circulating Chiller is a precision-engineered laboratory-grade refrigeration system designed for stable, continuous thermal management of external equipment—including rotary evaporators, spectrophotometers, laser sources, vacuum pumps, and analytical instrumentation requiring active cooling. It operates on a vapor-compression refrigeration cycle using environmentally compliant R134a refrigerant, eliminating ozone-depleting chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). The unit integrates a Copeland scroll compressor with dual-flex mounting to minimize mechanical vibration and acoustic emission—critical in noise-sensitive laboratories. Heat exchange is optimized via an air-cooled finned condenser constructed from oxygen-free copper spiral tubing, enhanced by proprietary intermediate expansion jointing technology for long-term sealing integrity and simplified maintenance. The evaporator is a 304 stainless steel coil immersed directly within the coolant reservoir, preventing freeze-induced mechanical stress during low-temperature operation and ensuring uniform thermal distribution across the circulating fluid.

Key Features

• High-efficiency Copeland scroll compressor with dual-flex isolation mounts for low-noise (<62 dB(A)) and low-vibration operation
• Oxygen-free copper spiral-tube condenser with finned-air cooling and proprietary intermediate胀接 (expansion-joint) technology for corrosion resistance and thermal reliability
• Immersion-type 304 stainless steel coil evaporator housed inside the reservoir—eliminates risk of freeze cracking and improves thermal response time
• Danfoss DML-series dryer filter with 3A molecular sieve desiccant, providing deep moisture removal and extended refrigerant system life
• Imported high-pressure rotary vane circulation pump delivering up to 16 L/min flow at adjustable pressure (1–10 bar), compatible with long-loop or high-backpressure applications
• Dual-stage particulate filtration: fine mesh screen at coolant fill port + secondary cartridge filter at reservoir outlet to prevent pump and instrument clogging
• Digital PID temperature controller with Pt100 RTD sensor, achieving ±2°C stability across the operating range (–10°C to 25°C)
• Integrated safety architecture: compressor soft-start delay, high-pressure cutout, motor overload protection, and real-time current monitoring
• Front-panel analog pressure gauge and transparent liquid-level sight tube for immediate system status verification
• R134a refrigerant charge compliant with ISO 5149-2014 and EU F-Gas Regulation (EU) No 517/2014

Sample Compatibility & Compliance

The DL10-3000G is engineered for compatibility with common laboratory heat-transfer fluids—including deionized water, 30% ethylene glycol/water mixtures, and silicone-based coolants—within its specified viscosity and freezing-point envelope. Its 30 L SUS304 reservoir supports extended unattended operation while resisting corrosion from mildly acidic or alkaline coolant formulations. All wetted materials meet ASTM A240/A240M standards for austenitic stainless steel. The unit conforms to IEC 61010-1:2010 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use) and carries CE marking under the Low Voltage Directive (2014/35/EU) and EMC Directive (2014/30/EU). While not certified for GMP or GLP environments out-of-the-box, its digital temperature logging capability (via optional RS485/Modbus interface) supports traceability requirements under FDA 21 CFR Part 11 when integrated with validated data acquisition software.

Software & Data Management

The DL10-3000G features a standalone microprocessor-based controller with local LED display and tactile keypad interface. For integration into centralized lab infrastructure, an optional RS485 serial port enables Modbus RTU communication, allowing remote parameter setting (setpoint, pump speed, alarm thresholds), real-time telemetry (temperature, pressure, runtime), and event logging via third-party SCADA or LIMS platforms. Temperature setpoints and stability metrics can be exported as CSV files for audit trails. Though no proprietary PC software is bundled, the open Modbus protocol ensures interoperability with LabVIEW, MATLAB, or custom Python-based monitoring scripts—facilitating compliance with ISO/IEC 17025 documentation workflows.

Applications

• Continuous cooling of rotary evaporator condensers to maximize solvent recovery efficiency and prevent vapor breakthrough
• Thermal stabilization of high-power laser diodes and optical benches where sub-degree drift compromises alignment or signal coherence
• Heat rejection from HPLC column ovens, mass spectrometer ion sources, and X-ray diffractometer detectors
• Temperature control of reaction calorimeters and jacketed glass reactors during exothermic synthesis
• Support of cryogenic sample preparation stages in materials science labs (e.g., pre-chilling TEM specimen holders)
• Backup cooling for environmental test chambers requiring auxiliary heat-sink capacity

FAQ

What is the minimum ambient temperature required for reliable operation?
The unit must be operated in environments between 5°C and 35°C, with relative humidity ≤70% non-condensing. Below 5°C, condenser airflow efficiency drops significantly, risking low-head pressure faults and reduced cooling capacity.
Can this chiller operate with 50% propylene glycol solution?
Yes—provided the mixture’s viscosity remains below 25 cP at the lowest operating temperature (–10°C). Propylene glycol solutions increase pump head requirement; verify system pressure remains within 1–10 bar operational window.
Is the reservoir accessible for cleaning or coolant replacement?
Yes—the top-mounted Ø60 mm fill port provides full access to the 30 L SUS304 reservoir. Internal surfaces are smooth-polished (Ra ≤ 0.8 µm) and drainable via bottom valve (not included; optional accessory).
Does the unit support external temperature feedback control?
No—the standard configuration uses only the built-in Pt100 sensor. External probe input requires factory modification and firmware reconfiguration; contact technical support prior to ordering.
What maintenance intervals are recommended for the Danfoss dryer filter?
Under continuous operation with clean coolant, replace the DML filter cartridge every 18 months or after 6000 hours—whichever occurs first—to maintain dew point < –40°C and prevent acid formation in the refrigerant loop.