Great Wall DL30-300 Circulating Chillers
| Brand | Great Wall |
|---|---|
| Origin | Henan, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | DL30-300 |
| Pricing | Upon Request |
Overview
The Great Wall DL30-300 Circulating Chiller is an engineered thermal management system designed for precise, stable low-temperature control in laboratory environments. Operating on a closed-loop refrigeration cycle with forced convection circulation, it delivers consistent coolant flow and temperature regulation—critical for applications requiring thermal stability during extended experimental runs. Unlike simple immersion coolers or bath-style units, the DL30-300 integrates a hermetic compressor, high-efficiency plate heat exchanger, and PID-controlled digital thermostat to maintain setpoint accuracy within ±0.3 °C across its operational range (typically –20 °C to +40 °C, dependent on ambient conditions and load). Its architecture supports integration with external equipment—including rotary evaporators, spectrophotometers, NMR pre-cooling jackets, and laser systems—enabling active heat extraction from process loops without direct contact between the chiller’s refrigerant and the user’s apparatus.
Key Features
- Stable temperature control via microprocessor-based PID algorithm with real-time feedback from dual-sensor monitoring (bath and outlet)
- Corrosion-resistant stainless steel reservoir (15 L capacity) with integrated level sensor and low-level alarm
- High-flow, low-noise centrifugal pump (max. 20 L/min at 0.3 MPa) featuring adjustable pressure and flow rate settings
- Intuitive 4.3-inch TFT LCD touchscreen interface with multilingual support (English, German, French, Spanish), password-protected parameter locking, and event logging
- Compressor protection circuitry including high/low pressure cutoff, overtemperature shutdown, and phase failure detection
- RS485 communication port compliant with Modbus RTU protocol for centralized lab monitoring and SCADA integration
Sample Compatibility & Compliance
The DL30-300 is compatible with standard laboratory coolant fluids—including 30% ethylene glycol/water, 50% propylene glycol/water, and deionized water—ensuring broad chemical resistance and freeze protection down to –25 °C. Its sealed circulation path prevents contamination of sensitive analytical instruments and eliminates evaporation-related concentration drift. From a regulatory standpoint, the unit conforms to IEC 61010-1:2010 for electrical safety in laboratory equipment and meets CE marking requirements for EMC (EN 61326-1) and low-voltage directives. While not certified for GMP manufacturing zones, its design supports GLP-compliant documentation practices: all temperature setpoints, deviations, alarms, and runtime data are timestamped and exportable via USB for audit-ready records—facilitating alignment with FDA 21 CFR Part 11 principles when paired with validated software workflows.
Software & Data Management
The chiller includes embedded firmware capable of storing up to 10,000 data points (temperature, flow rate, compressor status, error codes) with automatic timestamping. Raw logs can be exported as CSV files via USB flash drive for post-processing in MATLAB, Excel, or LIMS platforms. Optional PC-based control software (GW-ChillControl v3.2) enables remote monitoring, multi-unit synchronization, scheduled start/stop profiles, and alarm email notifications via SMTP. All configuration changes are logged with operator ID and time stamp, supporting traceability requirements in quality-controlled laboratories. Data integrity is preserved through non-volatile memory retention—even during power interruption—and firmware updates are performed via signed binary packages to prevent unauthorized modification.
Applications
- Condenser cooling for rotary evaporation under reduced pressure, minimizing solvent bumping and improving recovery yield
- Thermal stabilization of HPLC columns and detectors to reduce baseline drift and enhance chromatographic resolution
- Temperature regulation of photomultiplier tubes, CCD sensors, and laser diodes in spectroscopy and imaging systems
- Process cooling in small-scale bioreactors, enzymatic reaction assays, and cryo-microscopy sample stages
- Supporting ASTM D2878 (viscosity testing at controlled temperatures) and ISO 2555 (solution viscosity measurement) protocols through precise bath temperature maintenance
FAQ
What is the minimum achievable temperature at full load?
Under standard ambient conditions (25 °C, 50% RH) and with 30% glycol/water coolant, the DL30-300 achieves –20 °C at zero heat load; at rated cooling capacity (300 W @ 20 °C ambient), the practical lower limit is approximately –12 °C.
Can this chiller be used with corrosive solvents like acetone or chloroform?
No. The internal wetted parts (pump head, reservoir, tubing) are compatible with aqueous glycol solutions and alcohols—but not with halogenated or highly volatile organic solvents. Consult the Material Compatibility Chart (Section 4.2 of the Operation Manual) before introducing non-standard fluids.
Is remote control via Ethernet or Wi-Fi supported?
Standard configuration includes RS485 Modbus only. Ethernet/Wi-Fi functionality requires optional GW-NET module (sold separately) and firmware upgrade to v4.1 or higher.
Does the unit meet noise emission standards for quiet labs?
Yes. Acoustic pressure level is ≤58 dB(A) at 1 m distance under typical operating conditions—compliant with ISO 7779 and suitable for shared instrumentation rooms.
What maintenance intervals are recommended?
Compressor oil and refrigerant charge require inspection every 24 months; glycol coolant replacement is advised annually or after 2000 operational hours, whichever occurs first. Filter cartridges should be replaced quarterly in high-dust environments.
