Hanuo GDH-0506W High-Precision Low-Temperature Circulating Bath

Overview

The Hanuo GDH-0506W is a high-precision low-temperature circulating bath engineered for demanding laboratory applications requiring exceptional thermal stability, rapid temperature response, and long-term operational reliability. Utilizing a dual-stage refrigeration system combined with PID-controlled heating and high-efficiency heat exchange architecture, the GDH-0506W maintains setpoint accuracy within ±0.005 °C under steady-state conditions—meeting the stringent thermal uniformity requirements of analytical instrumentation calibration, material property testing, and reaction kinetics studies. Its stainless-steel bath chamber and corrosion-resistant fluid path ensure compatibility with water, ethanol/water mixtures, silicone oils, and other common heat-transfer media. Designed for integration with external equipment—including spectrophotometers, viscometers, calorimeters, and chromatography columns—the unit supports both internal recirculation and external closed-loop circulation at up to 6 L/min flow rate.

Key Features

• Precision temperature control across a wide operating range: –40 °C to 100 °C (model-dependent), with selectable configurations optimized for low-temperature cryogenic stability or high-temperature precision work.
• Ultra-stable thermal performance: ±0.005 °C temperature fluctuation (typical), achieved via adaptive PID algorithm, high-resolution platinum RTD sensor (0.001 °C resolution), and low-noise circulation pump.
• Dual-function thermoregulation: Integrated compressor-based refrigeration and tubular heating elements enable seamless transition between cooling and heating without manual intervention.
• Robust circulation architecture: Internally recirculated bath fluid ensures homogeneous temperature distribution; external loop port supports connection to jacketed reactors, condensers, or custom thermal manifolds.
• Stainless-steel working bath (250 × 200 × 150 mm) with removable lid and standardized opening (180 × 140 mm) for easy sample access and accessory mounting.
• Intuitive digital interface with real-time display of setpoint, actual temperature, and system status; programmable ramp/soak profiles available on higher-tier firmware versions.

Sample Compatibility & Compliance

The GDH-0506W is suitable for use with a broad spectrum of laboratory samples and instruments requiring precise thermal conditioning—including glassware, immersion probes, cuvettes, reaction vessels, and externally jacketed analytical components. Its fluid containment system complies with standard chemical compatibility guidelines for aqueous and organic heat-transfer fluids. While not certified to ISO/IEC 17025 or GLP as a standalone measurement device, the bath’s documented temperature stability, traceable calibration support (via optional NIST-traceable RTD verification), and repeatable performance make it appropriate for environments governed by ISO 17025-accredited laboratories, USP , and ASTM E2877-22 (Standard Guide for Thermal Stability Testing). The unit meets CE electromagnetic compatibility (EMC) and low-voltage directive requirements, and its electrical insulation conforms to IEC 61010-1 safety standards for laboratory equipment.

Software & Data Management

The GDH-0506W operates as a stand-alone instrument with local digital control; optional RS485 or USB communication interfaces enable integration into centralized lab management systems. When connected, users may log temperature history, export time-stamped data in CSV format, and remotely adjust setpoints via ASCII command protocol. Audit trail functionality—including operator ID, parameter changes, and alarm events—is supported when interfaced with compliant LIMS or ELN platforms adhering to FDA 21 CFR Part 11 requirements (with appropriate electronic signature implementation). Firmware updates are delivered via secure vendor portal and include enhanced thermal modeling algorithms for improved transient response prediction.

Applications

• Calibration of temperature-sensitive sensors (e.g., thermistors, thermocouples, infrared detectors) in metrology labs.
• Thermal conditioning of optical components during spectroscopic measurements to minimize drift-induced spectral artifacts.
• Controlled-temperature solvent baths for dissolution testing per USP and pharmacopeial methods.
• Stabilization of HPLC column ovens and detector cells to reduce baseline noise and retention time variability.
• Low-temperature reaction monitoring in synthetic chemistry, including Grignard and lithiation protocols requiring sub-zero thermal control.
• Material testing under defined thermal loads—e.g., coefficient of thermal expansion (CTE) determination, polymer crystallinity analysis, and rheological characterization.

FAQ

What is the minimum achievable temperature for the GDH-0506W model?

The GDH-0506W is configured for a temperature range of –5 °C to 100 °C. For lower endpoints, select models such as GDH-4006W (–40 °C to 100 °C) or GDH-3506W (–35 °C to 100 °C).
Does the unit support external temperature feedback control?

Yes—optional PT100 input allows user-defined probe placement within the application system, enabling cascade control mode where the bath regulates based on actual process temperature rather than bath fluid temperature.
Is the circulation pump adjustable for flow rate?

The pump delivers a nominal 6 L/min at rated pressure; while fixed-speed in base configuration, variable-frequency drive (VFD) upgrade kits are available for fine-tuned flow modulation.
Can this bath be used with flammable solvents?

Only non-flammable, low-volatility heat-transfer fluids (e.g., ethylene glycol/water blends, silicone oils) are recommended. Use with flammable solvents requires additional explosion-proof certification not provided with standard units.
What maintenance intervals are recommended for optimal thermal stability?

Annual verification of refrigerant charge, condenser coil cleaning, and RTD calibration traceability review are advised. Bath fluid should be replaced every 6–12 months depending on usage frequency and medium type.