Hanuo HX-08 Low-Temperature Constant-Temperature Circulator

Overview

The Hanuo HX-08 Low-Temperature Constant-Temperature Circulator is an engineered thermal management system designed for precise, stable, and reproducible temperature control in laboratory and analytical applications. It operates on a closed-loop liquid circulation principle—using a thermally conductive bath medium (typically water or water-glycol mixtures) to transfer heat between the circulator’s temperature-controlled reservoir and external devices or reaction vessels. Unlike simple immersion baths, the HX-08 integrates dual-mode refrigeration and heating capability, enabling seamless transition across its full 0–100 °C operating range with high thermal inertia resistance and minimal overshoot. Its core architecture supports both internal uniformity maintenance (via built-in recirculation) and external process integration (via adjustable flow pump output), making it suitable for coupling with rotary evaporators, spectrophotometer cells, calorimeters, and other externally jacketed instrumentation requiring active thermal regulation.

Key Features

• High-efficiency air-cooled hermetic refrigeration compressor delivering rapid cooldown from ambient to 0 °C in under 15 minutes (typical, with water bath at 25 °C initial condition).
• Microprocessor-based PID temperature controller with digital setpoint input, real-time display (0.01 °C resolution), and user-adjustable deviation compensation for sensor calibration traceability.
• Dual-circulation design: internal loop ensures homogeneous bath temperature distribution (±0.05 °C stability at setpoint); external loop provides up to 16 L/min flow rate (adjustable) for remote thermal load management.
• 304 stainless steel inner tank—electropolished finish for corrosion resistance, cleanability, and compatibility with aqueous and mild organic solvent media.
• Comprehensive safety architecture: independent over-temperature cutoff (hardware-latched), compressor thermal overload protection, and electronic current monitoring with audible/visual alarm.
• Compact footprint (320 × 370 × 670 mm) optimized for benchtop deployment in QC labs, R&D workstations, and university teaching facilities.

Sample Compatibility & Compliance

The HX-08 accommodates standard laboratory glassware—including 1–5 L jacketed reactors, immersion probes, and flow-through cells—within its 8 L bath volume. The open-top design allows unobstructed access for sample insertion, probe positioning, and visual monitoring. While not certified for hazardous location use (e.g., ATEX or IECEx), the unit complies with general-purpose electrical safety standards applicable to Class I, Division 2 laboratory equipment per IEC 61010-1:2010. Its temperature control algorithm and hardware redundancy support GLP-aligned operation when integrated into validated workflows; audit trails are maintained via manual logbook documentation, as the device does not include FDA 21 CFR Part 11-compliant electronic record functionality.

Software & Data Management

The HX-08 operates as a standalone instrument with no embedded software stack or network interface. All configuration and monitoring occur via its front-panel keypad and LED display. Temperature setpoints, actual readings, and alarm status are visible in real time. For data capture, users may integrate external USB or RS-232 temperature loggers (e.g., Omega OM-DAQPRO-5300) using the optional analog voltage output (0–5 V corresponding to 0–100 °C). No proprietary drivers or cloud connectivity are provided. This minimalist firmware approach enhances long-term reliability and avoids obsolescence risks associated with embedded OS dependencies.

Applications

• Temperature stabilization of UV-Vis cuvettes and fluorescence sample holders during kinetic assays.
• Thermal conditioning of solvents prior to HPLC mobile phase preparation and degassing.
• Cooling/heating support for vacuum distillation systems, particularly during low-boiling-point fraction collection.
• Calibration verification of thermocouples, RTDs, and infrared thermometers against NIST-traceable reference points.
• Controlled-rate thawing or chilling of biological reagents (e.g., enzymes, antibodies) where rapid thermal shock must be avoided.
• Material testing environments—for evaluating polymer viscosity, gelation onset, or phase transitions under isothermal conditions.

FAQ

What is the maximum external load capacity supported by the HX-08’s circulation pump?
The external flow rate is rated at ≤16 L/min at 0.2 bar backpressure; performance declines gradually above 3 m total head height. For optimal thermal transfer, keep external tubing length under 3 m and inner diameter ≥6 mm.
Can the HX-08 maintain sub-zero temperatures?
No—the HX-08 model is configured for 0–100 °C only. Sub-zero operation requires variants such as the HX-4008 (−40 to 100 °C), which uses specialized refrigerant and insulated bath construction.
Is the stainless steel tank compatible with ethylene glycol solutions?
Yes—304 stainless steel exhibits excellent resistance to diluted glycol/water mixtures (up to 60% v/v) at temperatures below 80 °C. Avoid prolonged exposure to >80 °C glycol blends without periodic pH monitoring.
Does the unit include a drain valve for bath fluid replacement?
Yes—a front-mounted quick-release drain valve enables complete reservoir emptying without disassembly.
What maintenance intervals are recommended for the refrigeration system?
Compressor oil and refrigerant integrity require inspection every 24 months under continuous operation; filter-drier replacement is advised every 36 months. Routine cleaning of condenser fins (biweekly in dusty environments) sustains cooling efficiency.