Zhongjiaojinyuan DX-208 600W Benchtop Low-Temperature Circulating Chiller

Overview

The Zhongjiaojinyuan DX-208 is an integrated, air-cooled benchtop circulating chiller engineered for precision temperature control in laboratory environments requiring stable low-temperature operation. Utilizing a hermetically sealed refrigeration circuit with R404A or R507 refrigerant (depending on configuration), the unit operates on the vapor-compression cycle to deliver consistent thermal management across demanding applications such as rotary evaporation, spectroscopy, calorimetry, and reaction cooling. Its operational range spans from −20 °C to +30 °C, enabling compatibility with both cryogenic sample conditioning and ambient-controlled processes. Designed for continuous duty (24 hours/day, 365 days/year), the DX-208 maintains temperature stability within ±0.1 °C under dynamic load conditions—critical for reproducible experimental outcomes in QC/QA, pharmaceutical development, and materials science workflows.

Key Features

• Compact vertical footprint (300 mm × 400 mm × 720 mm) optimized for limited bench space without compromising reservoir volume or thermal capacity
• Large-diameter stainless steel bath (Φ250 mm × 200 mm depth) constructed from electropolished SUS304 for corrosion resistance and ease of cleaning
• Dual-display interface with independent red/green LED windows showing real-time bath temperature and user-setpoint—enabling rapid visual verification during multi-step protocols
• Intelligent dynamic temperature control algorithm minimizing overshoot and stabilizing bath uniformity across axial and radial gradients
• Integrated safety architecture including compressor thermal delay, overcurrent protection, high-pressure cutoff, and motor winding overheat monitoring
• Software-lock function restricting parameter modification to authorized personnel—supporting GLP/GMP documentation requirements
• Ultra-low-noise magnetic-drive circulation pump (15 L/min max flow, 8 m max head) suitable for closed-loop systems with elevated backpressure, including those incorporating pressure-rated tubing or inline filters
• Front-accessible service panel for routine condenser coil maintenance—reducing downtime and extending system longevity
• Standardized 1/2″ NPT stainless steel fluid ports compatible with reinforced silicone, PTFE, or fluorinated elastomer tubing per ASTM D1418 specifications

Sample Compatibility & Compliance

The DX-208 supports both open-bath immersion and closed-loop external circulation configurations. When used with optional sealed bath covers, it complies with ISO 17025 clause 5.4.2 regarding environmental condition control during calibration procedures. Its stainless steel reservoir and fluid path meet USP material compatibility guidelines for non-reactive contact surfaces. The unit’s continuous-duty rating and thermal stability align with ASTM E2910–22 requirements for temperature-controlled auxiliary equipment in analytical instrumentation support systems. All electrical components conform to IEC 61010-1:2010 for laboratory equipment safety, and the control firmware supports audit-trail-ready operation when integrated into validated laboratory networks.

Software & Data Management

While the DX-208 operates via standalone PID controller with local keypad interface, its analog 0–10 V and RS485 Modbus RTU outputs enable integration into centralized building management systems (BMS) or LIMS platforms. Optional data logging modules record timestamped temperature, setpoint, and pump status at user-defined intervals (1 s to 60 min resolution), generating CSV-compatible files traceable to ISO/IEC 17025 clause 7.7. Firmware updates are performed via USB port using signed binaries—ensuring integrity per FDA 21 CFR Part 11 electronic record provisions when deployed in regulated environments.

Applications

• Cooling dual 2 L rotary evaporators simultaneously under vacuum, maintaining bath homogeneity during solvent recovery at −10 °C
• Thermal regulation of FTIR spectrometer detectors and CCD-based imaging systems requiring sub-ambient stabilization
• Temperature-controlled feed streams in catalytic hydrogenation reactors with exothermic profiles
• Calibration of thermocouples and RTDs against reference standards in metrology labs
• Low-temperature conditioning of polymer samples prior to DMA or DSC analysis per ASTM D7028
• Support of HPLC column ovens and detector cells where ambient drift compromises retention time reproducibility

FAQ

What is the maximum allowable backpressure for external circulation?
The integrated pump delivers up to 8 m head (≈0.8 bar), supporting closed loops with pressure drops up to 4 kg/cm² when paired with optional high-pressure pump accessories.
Can the unit operate unattended for extended periods?
Yes—rated for continuous 24/7/365 operation with built-in safeguards against dry-run, overtemperature, and power anomaly events.
Is the reservoir compatible with organic solvents?
SUS304 construction provides broad compatibility with water-miscible solvents (e.g., ethanol, acetone, ethylene glycol/water mixtures); prolonged exposure to chlorinated or strong acidic media is not recommended.
Does the system support remote monitoring?
Standard RS485 Modbus RTU interface enables integration with SCADA or LabVIEW-based supervision systems; optional Ethernet gateway available for TCP/IP communication.
How often does the condenser require maintenance?
Under typical laboratory air quality (ISO 8573-1 Class 5), biannual inspection and brush cleaning of the front-accessible coil are sufficient to maintain rated cooling capacity.