Hanuo GH-15 High-Precision Constant-Temperature Water Bath

Overview

The Hanuo GH-15 High-Precision Constant-Temperature Water Bath is an engineered thermal stability platform designed for laboratories requiring rigorous temperature control in analytical, biochemical, and materials testing workflows. Operating on the principle of resistive heating combined with PID-controlled feedback regulation and high-efficiency internal circulation, the GH-15 maintains thermal equilibrium within a 15 L stainless-steel bath chamber. Its core function is to deliver stable, uniform, and traceable thermal environments—critical for calibration of thermometers and temperature sensors (per ISO/IEC 17025 and ASTM E77), enzyme kinetics studies, viscosity standardization, cell culture incubation support, and reference temperature point verification in metrology labs. Unlike general-purpose water baths, the GH-15 integrates microprocessor-based thermal management with dual-sensor redundancy (PT100-grade) to minimize spatial and temporal drift, achieving ±0.01 °C stability under steady-state conditions at setpoints between ambient and 100 °C.

Key Features

• Microprocessor-controlled PID algorithm with adaptive tuning for rapid thermal equilibration and minimal overshoot
• High-stability PT100 platinum resistance thermometer (PRT) sensor array with 0.001 °C display resolution and NIST-traceable calibration capability
• Stainless-steel 304 bath tank (300 × 250 × 200 mm, 200 mm depth) featuring corrosion-resistant finish and optimized geometry for laminar internal circulation
• Dual LED display showing real-time measured temperature and user-defined setpoint simultaneously
• Internal recirculation pump (non-submersible, sealed magnetic drive) ensuring ≤±0.02 °C temperature uniformity across the full working volume
• Touch-sensitive membrane keypad with lockout function to prevent accidental parameter changes during extended experiments
• Over-temperature and dry-run protection circuits compliant with IEC 61010-1 safety standards

Sample Compatibility & Compliance

The GH-15 accommodates standard laboratory vessels—including glass beakers (up to 1000 mL), reaction flasks, cuvettes, and calibration probes—within its 235 × 160 mm opening. It supports both aqueous and silicone-oil media (with optional oil-rated accessories), enabling operation from ambient to 100 °C in water or up to 200 °C when configured as an oil bath (GH-15A variant). The system meets essential regulatory expectations for GLP-compliant thermal validation: it enables documented temperature mapping per ASTM E2879, supports IQ/OQ protocols for lab equipment qualification, and provides stable baselines required for USP thermometer calibration and ISO 17025-accredited temperature measurement services. While not inherently 21 CFR Part 11–compliant, audit trails and electronic records may be generated via external data logging interfaces.

Software & Data Management

The GH-15 operates as a standalone instrument with embedded firmware; no proprietary software is required for basic operation. However, it features an RS232 serial interface (optional USB-to-serial adapter) compatible with third-party SCADA platforms (e.g., LabVIEW, MATLAB, or Python-based PySerial scripts) for automated temperature profiling, time-stamped data acquisition, and integration into LIMS environments. Users may export timestamped temperature logs (measured vs. setpoint) at configurable intervals (1–60 s), supporting retrospective analysis for QC batch records. Firmware updates are delivered via ASCII command protocol and do not require cloud connectivity—ensuring air-gapped deployment where network isolation is mandated.

Applications

• Calibration and verification of liquid-in-glass thermometers, RTDs, and thermocouples against fixed-point references
• Thermal preconditioning of samples prior to DSC, TGA, or rheological testing
• Controlled-temperature enzymatic assays and protein denaturation studies
• Stabilization of optical components (e.g., laser diodes, interferometer stages) requiring low-drift thermal anchoring
• Supporting ASTM D445 (kinematic viscosity) and ISO 3104 test methods through precise bath temperature maintenance
• Quality assurance in pharmaceutical manufacturing for dissolution apparatus temperature verification (USP )
• Electronics testing: thermal cycling of PCB assemblies and semiconductor packages under controlled ramp/soak profiles

FAQ

Is the GH-15 suitable for use with silicone oil?
Yes—the GH-15 bath chamber and heating elements are compatible with heat-transfer oils rated up to 100 °C. For operation above 100 °C, the GH-15A model (rated to 200 °C) is recommended.
Does the unit support external temperature probe input for chamber monitoring?
No—the GH-15 relies solely on its integrated dual PRT sensor system. External probe inputs are not supported in the base configuration.
Can the internal circulation pump be disabled?
No—circulation is integral to achieving specified temperature uniformity and cannot be deactivated without compromising performance specifications.
What is the maximum allowable load for continuous operation at 100 °C?
The GH-15 is rated for continuous duty at full temperature range; however, sustained operation >95 °C with high thermal mass loads may extend stabilization time and should be verified per application-specific thermal load modeling.
Is CE marking or RoHS certification available for export to EU markets?
Yes—units shipped to EEA countries include CE marking and full RoHS 2011/65/EU compliance documentation, including DoC and EMC test reports per EN 61326-1.