Hanuo HX-1008 Advanced Temperature-Controlled Circulating Bath

Overview

The Hanuo HX-1008 Advanced Temperature-Controlled Circulating Bath is a precision-engineered thermal management system designed for laboratory applications requiring stable, programmable temperature control across a wide operational range (−10 °C to 100 °C). It functions as a closed-loop liquid circulator, delivering thermally conditioned fluid—water or water-glycol mixtures—to external devices (e.g., spectrophotometer jackets, reaction chambers, calorimeters) or maintaining uniform bath temperature for sample immersion. Its dual-mode thermoelectric-compressor hybrid architecture enables rapid cooling and precise heating, achieving ±0.05 °C temperature stability under steady-state conditions—a performance benchmark aligned with ISO 17025 calibration traceability requirements for thermal instrumentation. The unit employs a microprocessor-based PID controller with real-time feedback from a high-stability Pt100 sensor mounted directly in the bath reservoir, minimizing thermal lag and ensuring reproducible setpoint adherence over extended operation.

Key Features

• Robust stainless steel bath chamber (304 grade) resistant to corrosion, thermal shock, and routine chemical exposure—ensuring long-term dimensional stability and ease of cleaning per GLP hygiene protocols.
• High-efficiency air-cooled hermetic refrigeration system with integrated overheat and overcurrent protection, compliant with IEC 61000-6-3 electromagnetic compatibility standards.
• Dual-circulation architecture: internal recirculation maintains spatial homogeneity within the bath (<0.02 °C gradient across 8 L volume); external circulation delivers up to 18 L/min at consistent setpoint temperature to auxiliary equipment via reinforced silicone tubing ports.
• Intuitive digital interface with 0.01 °C display resolution, user-configurable temperature offset correction (±5.00 °C), and programmable ramp-soak profiles for multi-stage thermal protocols.
• Comprehensive safety suite: independent high-limit thermostat, automatic power cutoff on temperature deviation >±3 °C, audible/visual alarm activation, and dry-run protection for pump motor longevity.
• Compact footprint (320×370×670 mm) optimized for benchtop integration in analytical labs, QC facilities, and university teaching laboratories with space constraints.

Sample Compatibility & Compliance

The HX-1008 accommodates standard laboratory glassware (up to 500 mL beakers, 250 mL flasks) and interfaces seamlessly with OEM accessories including immersion probes, jacketed reactors (e.g., Chemglass, Ace Glass), and analytical instrument cooling manifolds. Fluid compatibility includes deionized water, 30% aqueous ethylene glycol, and low-viscosity silicone oils (≤50 cSt)—all verified against ASTM D1384 corrosion resistance criteria. The device meets CE marking requirements (2014/30/EU EMC Directive, 2014/35/EU LVD Directive) and conforms to ISO 9001:2015 manufacturing quality controls. While not FDA 21 CFR Part 11–validated out-of-the-box, its audit-ready event log (timestamped temperature deviations, alarm triggers, power cycles) supports GMP/GLP documentation workflows when paired with validated third-party data acquisition software.

Software & Data Management

The HX-1008 operates autonomously via front-panel controls but supports RS232 serial communication (optional USB-to-serial adapter) for remote parameter setting and real-time temperature logging using industry-standard terminal emulators (e.g., Tera Term, PuTTY). Logged data exports as CSV files compatible with Excel, MATLAB, and LabVIEW. Firmware updates are performed via ASCII command protocol, preserving configuration integrity during version upgrades. For regulated environments, the unit’s non-volatile memory retains calibration coefficients and user-defined offsets across power cycles—enabling repeatable instrument performance verification per USP Analytical Instrument Qualification guidelines.

Applications

• Calibration of thermometers, RTDs, and thermocouples per ASTM E74 and ISO/IEC 17025 Annex A.3.
• Temperature stabilization of UV-Vis spectrophotometer cuvette holders and HPLC column ovens.
• Controlled-rate heating/cooling in kinetic studies (e.g., enzyme activity assays, polymer crystallization).
• Thermal conditioning of viscometers, density meters, and refractometers requiring bath-mounted sensors.
• Support for ASTM D97 (pour point), D2500 (cloud point), and D5949 (miniaturized pour point) petroleum testing protocols.
• Preconditioning of electronic components and PCB assemblies prior to environmental stress screening.

FAQ

What fluids are recommended for operation below 0 °C?
A 30% (v/v) aqueous solution of ethylene glycol is recommended for sustained operation between −10 °C and 0 °C. Pure water must not be used below 0 °C due to freezing risk and potential bath damage.
Does the HX-1008 support external temperature feedback control?
No—the unit regulates based solely on internal bath sensor input. For process-critical applications requiring external probe feedback, integration with a standalone PID controller (e.g., Omega CN7800 series) is required.
Is the external pump flow rate adjustable?
Flow is fixed at 16–18 L/min at full load; no variable-speed pump is included. Flow reduction may be achieved using calibrated needle valves installed in the external loop.
How often should the refrigerant charge be verified?
Under normal use, refrigerant integrity remains stable for ≥5 years. Verification is recommended if cooling capacity drops >20% at nominal load or if compressor runtime exceeds 85% duty cycle continuously for >72 hours.
Can the unit operate continuously for 72+ hours?
Yes—designed for unattended 24/7 operation with thermal overload safeguards and continuous fan-cooling. Ambient temperature must remain ≤30 °C with ≥15 cm clearance around rear ventilation grilles.