Zhongjiaojinyuan DX-204 300W Benchtop Low-Temperature Circulating Chiller
| Brand | Zhongjiaojinyuan |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Direct Manufacturer |
| Model | DX-204 |
| Instrument Type | Integrated Circulating Chiller |
| Cooling Method | Air-Cooled |
| Temperature Range | −20 °C to +30 °C |
| Cooling Capacity | 300 W at 20 °C Liquid Temperature |
| Temperature Stability | ±0.1 °C |
| Circulation Pump Pressure | 0.8 bar |
| Circulation Flow Rate | 15 L/min |
| Reservoir Volume | 4 L |
| Operating Mode | Continuous Operation |
Overview
The Zhongjiaojinyuan DX-204 is a compact, air-cooled benchtop circulating chiller engineered for precise thermal management in analytical and synthetic laboratory workflows. It operates on vapor-compression refrigeration principles, utilizing a hermetically sealed compressor with integrated thermal protection circuits (overheat, overcurrent, and startup delay) to ensure long-term reliability under continuous duty cycles. Designed for integration with external equipment—including rotary evaporators, condensers, spectrophotometer Peltier cells, and reaction jackets—the DX-204 delivers stable low-temperature circulation across a wide operational envelope (−20 °C to +30 °C), with high thermal reproducibility enabled by dynamic PID control and dual-sensor feedback architecture. Its 4 L stainless-steel reservoir features a large open-top geometry optimized for direct immersion experiments or auxiliary bath applications, while the unit’s vertical footprint (230 mm W × 500 mm D × 500 mm H) minimizes bench space requirements without compromising service accessibility.
Key Features
- Integrated air-cooled refrigeration system with sealed compressor and factory-calibrated thermal safety interlocks
- Dual-display interface: independent red/green LED windows showing real-time bath temperature and user-defined setpoint
- Software lock function restricting parameter modification to authorized personnel—supports lab access control protocols
- Ultra-quiet magnetic-drive circulation pump delivering up to 15 L/min at 0.8 bar, compatible with closed-loop systems requiring low pulsation and minimal vibration transmission
- Front-access panel for routine maintenance of condenser coils and air intake filters—no tools required
- Standard 304 stainless-steel fluid path and reservoir; optional insulated lid available for open-bath configurations to reduce evaporation and ambient heat ingress
- Modular hose interface with ISO-KF–compatible stainless-steel ports (M16×1.5) supporting rapid connection to diverse external apparatus
Sample Compatibility & Compliance
The DX-204 is compatible with aqueous solutions, water–glycol mixtures (up to 30 % v/v), and low-viscosity organic coolants commonly used in rotary evaporation and reflux condensation. Its closed-loop design meets general requirements for ISO/IEC 17025-accredited laboratories where traceable temperature stability and operator safety are mandated. While not certified to UL/CSA or CE for standalone medical device use, the unit complies with IEC 61010-1:2010 for electrical safety in laboratory environments. All firmware logic adheres to GLP-aligned operational logging conventions, including timestamped setpoint changes and fault event recording—facilitating internal audit trails per FDA 21 CFR Part 11 when paired with validated data capture software.
Software & Data Management
The DX-204 operates via embedded microcontroller firmware with no external PC dependency. Temperature setpoints, lock status, and alarm history are retained through power cycles. Optional RS-485 Modbus RTU interface (sold separately) enables integration into centralized building management systems or LIMS platforms for remote monitoring and scheduled setpoint sequencing. Data export requires third-party SCADA or LabVIEW drivers; no proprietary cloud service or vendor-hosted dashboard is included. Firmware updates are performed manually via USB interface using manufacturer-provided binaries—no over-the-air capability is implemented, preserving network isolation in regulated environments.
Applications
- Cooling dual 1 L rotary evaporators simultaneously under vacuum conditions, maintaining condenser temperatures ≤ 5 °C at ambient loads up to 300 W
- Thermostating jacketed reactors during exothermic Grignard or lithiation reactions requiring sub-ambient initiation temperatures
- Stabilizing optical components in UV-Vis and FTIR spectrometers where detector drift correlates with thermal fluctuation
- Supplying chilled fluid to chromatographic column ovens or preparative HPLC chillers operating within −10 °C to +25 °C range
- Supporting cryogenic sample storage staging in pre-analytical workflows prior to LC-MS injection
FAQ
What is the maximum allowable coolant viscosity for reliable pump operation?
The circulation pump is rated for fluids with kinematic viscosity ≤ 20 cSt at operating temperature. Glycol–water mixtures exceeding 30 % v/v may require flow rate derating.
Can the DX-204 be used with pressurized external loops?
Yes—when equipped with the optional high-pressure pump module (max 4 kg/cm²), it supports closed-loop systems with elevated backpressure, such as jacketed glassware manifolds with narrow-bore tubing.
Is the reservoir volume sufficient for continuous operation with a 1 L rotary evaporator?
At nominal load (200–250 W), the 4 L reservoir provides ≥ 90 minutes of thermal inertia before significant temperature drift occurs—sufficient for standard evaporation cycles without active top-up.
Does the unit support external temperature probe input for cascade control?
No—temperature regulation is based solely on internal Pt100 sensor feedback. External probe integration requires third-party PID controllers interfaced via analog voltage output.
What maintenance intervals are recommended for optimal longevity?
Condenser coil cleaning every 3 months in dust-prone environments; annual verification of refrigerant charge and compressor oil level by certified HVAC-R technician.
