Zhongjiaojinyuan HX-205 200W Circulating Chiller with Integrated Refrigeration and Heating

Overview

The Zhongjiaojinyuan HX-205 is an integrated circulating chiller engineered for precise temperature control across a wide operational range—from cryogenic conditions at –20 °C up to high-temperature stability at 95 °C. Unlike conventional water baths requiring external cooling sources, the HX-205 incorporates a sealed, self-contained refrigeration compressor and electric heating system within a single compact chassis. Its operation is based on closed-loop thermoregulation: a PID-controlled microprocessor continuously monitors bath temperature via a high-stability Pt100 sensor, dynamically modulating refrigerant expansion and resistive heating output to maintain setpoint accuracy within ±0.05 °C. Designed for laboratory environments where space efficiency and thermal reliability are critical, the unit delivers continuous circulation at flow rates of 5–10 L/min against a maximum backpressure of 0.25 bar—sufficient to support externally connected analytical instruments without flow interruption or thermal lag.

Key Features

• Integrated dual-mode thermal management: independent compression-based refrigeration and resistive heating in one enclosure, eliminating dependency on tap water or external chillers.
• Vertical footprint optimized for benchtop integration: overall dimensions of 215 × 405 × 550 mm (W × D × H) and 30 kg mass enable stable placement beneath fume hoods or adjacent to electrophoresis rigs and viscometers.
• Wide-access bath opening (140 × 150 mm) and 150 mm depth facilitate direct sample immersion and manipulation during low-temperature experiments—no need for auxiliary cooling jackets or dry ice baths.
• Configurable display resolution: optional 0.1 °C or 0.01 °C digital readout supports both routine QC workflows and high-precision calibration protocols.
• Comprehensive safety architecture: real-time monitoring of overtemperature, low fluid level, sensor open/short circuit, and compressor fault conditions—with audible/visual alerts and automatic shutdown to prevent equipment damage or thermal runaway.
• Modular connectivity: standard RS485 interface (optional) enables integration into centralized lab automation systems; multiple external port configurations support quick-connect fittings for diverse OEM instrument couplings.

Sample Compatibility & Compliance

The HX-205 is compatible with aqueous and water-miscible coolant solutions (e.g., 20–30% ethylene glycol/water mixtures), supporting long-term operation down to –20 °C without freezing risk. Its stainless-steel bath interior and corrosion-resistant pump housing ensure chemical compatibility with common laboratory reagents and cleaning agents. While not certified to IEC 61010-1 or UL 61010B as a standalone medical device, the unit meets general-purpose electrical safety requirements for Class I laboratory equipment. Its temperature stability performance aligns with ASTM E1137/E1137M (Standard Specification for Laboratory Thermometers) and ISO/IEC 17025 traceability frameworks when used with calibrated reference sensors. For regulated environments, optional audit-trail-capable firmware (via RS485 + external SCADA) supports GLP-compliant data logging and user-access controls.

Software & Data Management

The HX-205 operates via an embedded 32-bit microcontroller running deterministic PID control algorithms with adaptive tuning parameters. Local operation uses a tactile keypad and dual-line LCD display. When equipped with the RS485 module, the unit supports Modbus RTU protocol for bidirectional communication—enabling remote setpoint adjustment, real-time temperature streaming, alarm status polling, and event-triggered data capture. Third-party software integration (e.g., LabVIEW, MATLAB, or custom Python scripts via serial-to-USB adapters) allows synchronization with instrument control sequences, such as timed cooling ramps during rheological sweeps or synchronized temperature holds during electrophoretic separation. All logged data—including timestamps, setpoints, actual temperatures, and alarm flags—can be exported in CSV format for post-acquisition analysis or regulatory submission.

Applications

• Direct low-temperature experimentation: DNA electrophoresis at 4 °C, enzyme kinetics assays at controlled sub-ambient conditions, cryo-sample preparation prior to SEM imaging.
• External temperature control: providing stable coolant supply to rotary evaporators (preventing solvent bumping), capillary viscometers (ensuring Newtonian flow validation), and vacuum molecular pumps (maintaining optimal oil viscosity).
• System-level thermal management: active cooling of electron microscope condenser lenses, ion pump controllers, RF amplifiers, and medical laser diodes requiring stable junction temperatures.
• Process validation support: serving as a reference thermal source in HVAC validation studies, sterilization cycle development (e.g., autoclave chamber mapping), and pharmaceutical dissolution apparatus qualification per USP <724>.

FAQ

Does the HX-205 require external water supply or drainage?

No—it is a fully self-contained system using internal refrigerant and recirculated bath fluid; no tap water connection or floor drain is needed.
Can it operate continuously for 72+ hours under full load?

Yes—the compressor and pump are rated for uninterrupted duty cycles; thermal protection circuits prevent overheating during extended operation.
What coolant fluids are recommended below 0 °C?

A mixture of deionized water and USP-grade propylene glycol (25% v/v) is validated for use down to –20 °C; avoid ethylene glycol in biosafety-sensitive labs.
Is the RS485 interface compatible with LabVIEW 2022 and higher?

Yes—standard Modbus RTU implementation ensures native driver support via NI-VISA; example VIs and register maps are provided in the technical documentation package.
How often does the system require maintenance?

Annual inspection of refrigerant charge integrity and pump seal integrity is recommended; filter replacement every 6 months if used with non-deionized coolants.