Hanuo HX-08 Low-Temperature Circulating Chiller

Overview

The Hanuo HX-08 Low-Temperature Circulating Chiller is an engineered thermal management system designed for precise temperature control of external laboratory equipment—including rotary evaporators, reaction jackets, spectrophotometer cells, and calorimeters—within a broad operational range of 0°C to 105°C. Unlike immersion-style baths, the HX-08 employs a closed-loop circulation architecture with an integrated high-efficiency air-cooled refrigeration unit and PID-controlled heating module, enabling stable, uniform thermal transfer without direct contact between the chiller fluid and the process environment. Its thermodynamic design follows standard heat exchange principles governed by Newton’s law of cooling and adheres to ISO 17025-relevant environmental conditioning requirements for calibration laboratories. The unit is not intended for cryogenic applications below −40°C; models such as the HX-4008 extend coverage to −40°C but require separate specification review.

Key Features

• Microprocessor-based digital temperature controller with dual-mode operation: setpoint programming and real-time deviation correction (±0.01°C offset adjustment capability)
• Stainless steel 304 bath tank—electropolished interior surface for corrosion resistance, ease of cleaning, and compatibility with aqueous and mild organic coolant mixtures (e.g., 30% ethylene glycol/water)
• Imported hermetically sealed scroll-type refrigeration compressor, delivering rapid cooldown from ambient to 0°C in ≤12 minutes under no-load conditions
• Dual-stage safety architecture: independent thermal fuses monitor both compressor winding temperature and bath sensor output; automatic power cutoff and audible alarm triggered upon deviation exceeding ±2.0°C from setpoint
• Adjustable flow rate (0–16 L/min) via calibrated bypass valve; pressure-rated output port (max. 2.5 bar) compliant with DIN 12878 quick-connect standards
• Front-panel LED display with 0.01°C resolution and real-time indication of actual vs. set temperature, pump status, and fault codes

Sample Compatibility & Compliance

The HX-08 supports continuous circulation through externally mounted apparatus with inlet/outlet ports conforming to standard 1/4″–3/8″ BSP or NPT threading. It is compatible with glass, PTFE-lined, and stainless steel jacketed reactors up to 5 L working volume. Coolant selection must comply with ASTM D1384 (corrosion testing of engine coolants) guidelines when using glycol-based fluids. The device meets CE marking requirements under the EU Machinery Directive 2006/42/EC and Electromagnetic Compatibility Directive 2014/30/EU. While not certified to UL 61010-1, its electrical insulation and grounding design align with Class I protection principles. For GLP-regulated environments, optional RS485 interface enables integration into audit-trail-capable data loggers satisfying FDA 21 CFR Part 11 requirements when paired with validated software.

Software & Data Management

The HX-08 operates autonomously without mandatory PC connectivity; however, its analog voltage output (0–5 V DC proportional to temperature) and digital RS485 Modbus RTU interface support third-party SCADA or LIMS integration. Users may configure logging intervals (1–300 sec), alarm thresholds, and ramp-soak profiles via external controllers. Firmware version v2.3+ includes non-volatile memory retention for last-set parameters during power loss. No proprietary software is bundled; configuration is performed via front-panel navigation only—ensuring long-term maintainability and eliminating vendor lock-in. All operational events (start/stop cycles, alarms, temperature excursions >±0.1°C sustained >60 s) are timestamped internally and retrievable via serial dump.

Applications

• Controlled-rate crystallization studies in pharmaceutical intermediate synthesis
• Thermal stabilization of UV-Vis cuvette holders during kinetic absorbance measurements (ASTM E275)
• Cooling of high-power laser diodes in optical spectroscopy setups
• Temperature-dependent viscosity measurement using rotational viscometers (ISO 2555, ASTM D2196)
• Pre-conditioning of polymer samples prior to DSC analysis (ASTM D3418)
• Environmental simulation for accelerated aging tests on electronic encapsulants (IEC 60068-2-14)

FAQ

What coolant fluids are recommended for use with the HX-08?

Deionized water is suitable for operation above 5°C. For sub-zero stability or extended service life, a 30% (v/v) ethylene glycol–water mixture is advised—verified per ASTM D1384 for minimal copper and aluminum corrosion.
Does the HX-08 support external temperature feedback control?

Yes—via optional PT100 input (0–100 Ω range) connected to the auxiliary sensor port, enabling cascade control where the chiller regulates based on process temperature rather than bath temperature.
Is the unit suitable for cleanroom environments?

The HX-08 emits no volatile organic compounds and features a sealed refrigerant circuit (R404A, GWP 3922); however, its air-cooled condenser requires ≥30 cm unobstructed rear clearance and ambient airflow of ≥200 m³/h for rated performance—making it unsuitable for ISO Class 5 or higher laminar flow enclosures without ducted exhaust.
Can the pump be run dry?

No—the centrifugal circulation pump lacks dry-run protection; operation without liquid will cause irreversible bearing damage within 90 seconds.
What maintenance intervals are recommended?

Compressor oil inspection every 24 months; condenser coil cleaning every 6 months in dusty environments; calibration verification of the PT100 sensor annually against a NIST-traceable reference thermometer.