Hanuo GH-30A High-Precision Constant-Temperature Oil/Water Bath Circulator
| Brand | Hanuo |
|---|---|
| Origin | Shanghai, China |
| Model | GH-30A |
| Temperature Range | Ambient to 200 °C |
| Temperature Stability | ±0.005 °C |
| Bath Volume | 30 L |
| Circulation Type | Internal Only |
| Display | Dual LED (Setpoint & Actual Temperature) |
| Control System | PID Intelligent Temperature Control |
| Compatibility | Water and Heat-Stable Oils (e.g., silicone oil, mineral oil) |
| Resolution | 0.001 °C |
| External Dimensions (W×D×H) | 400×330×230 mm |
| Bath Opening | 310×280 mm |
| Depth | 230 mm |
Overview
The Hanuo GH-30A High-Precision Constant-Temperature Oil/Water Bath Circulator is an engineered thermal stability platform designed for laboratories requiring exceptional temperature uniformity and long-term drift control in both aqueous and high-boiling-point organic media. Operating on the principle of resistive heating combined with precision PID feedback regulation and high-efficiency internal circulation, the GH-30A maintains thermal equilibrium across its 30 L working bath volume without external refrigeration or mechanical compression. Its core architecture prioritizes metrological integrity—making it suitable not only for routine sample conditioning but also for calibration traceability applications, including thermometric standardization per ISO/IEC 17025-accredited workflows and reference thermometer verification in accordance with ASTM E77 and ISO 17034.
Key Features
- Thermal stability of ±0.005 °C at setpoints up to 200 °C—validated under steady-state conditions using NIST-traceable Pt100 probe arrays.
- Dual-channel LED display showing real-time bath temperature (0.001 °C resolution) and user-defined setpoint, with intuitive tactile membrane keypad interface.
- Optimized internal circulation pump delivering laminar flow distribution to minimize axial and radial thermal gradients (<0.02 °C spatial deviation across full bath volume).
- Robust stainless-steel bath chamber compatible with water (up to 95 °C), silicone oils (up to 200 °C), and other non-corrosive heat-transfer fluids meeting IEC 60079-0 flammability class requirements.
- Compact desktop footprint (400×330×230 mm) with large 310×280 mm opening—facilitating immersion of tall vessels, reactor jackets, or multi-sensor probes.
- Programmable ramp-and-soak profiles via optional RS232/USB interface (firmware v2.1+), supporting GLP-compliant temperature logging with timestamped event markers.
Sample Compatibility & Compliance
The GH-30A accommodates a broad range of sample formats—including glass flasks, jacketed reactors, viscometer spindles, refractometer cells, and sensor calibration rigs—without compromising thermal fidelity. Its fluid compatibility extends to deionized water, glycerol-water mixtures, polydimethylsiloxane (PDMS)-based oils, and paraffinic heat-transfer fluids rated for continuous operation at 200 °C. From a regulatory standpoint, the unit meets CE marking requirements under Directive 2014/30/EU (EMC) and 2014/35/EU (LVD). While not inherently 21 CFR Part 11 compliant, audit-ready data export (CSV/TXT) and manual calibration log templates support GMP-aligned documentation practices when deployed in QC labs following USP Analytical Instrument Qualification guidelines.
Software & Data Management
The GH-30A operates autonomously via embedded firmware with no proprietary software dependency. For advanced integration, optional PC connectivity enables remote monitoring and scheduled temperature profiling using Hanuo’s LabLink™ Utility (Windows/macOS/Linux compatible). All logged data include ISO 8601 timestamps, temperature readings (±0.002 °C system uncertainty), and operational status flags (e.g., “Heating Active”, “Stabilization Achieved”). Exported files conform to ASTM E2500-17 Annex A3 metadata conventions and are structured for direct import into LIMS platforms such as LabWare LIMS or Thermo Fisher SampleManager.
Applications
- Calibration of liquid-in-glass thermometers, RTDs, and thermocouples against primary standards.
- Temperature-dependent viscosity measurements (e.g., ASTM D445, ISO 3104) using rotational or capillary viscometers.
- Controlled-temperature reaction kinetics studies in synthetic organic chemistry and polymerization processes.
- Thermal pre-conditioning of optical components prior to interferometric testing (e.g., ZYGO Metrology).
- Stability testing of pharmaceutical formulations per ICH Q5C guidelines under accelerated aging protocols.
- Heat transfer coefficient validation in microfluidic device characterization setups.
FAQ
Is the GH-30A suitable for use with flammable oils?
No. It is certified for use only with non-flammable, thermally stable heat-transfer fluids having flash points >220 °C (e.g., Dow Corning PM-1000, Wacker AK20). Flammable solvents are strictly prohibited.
Does the unit support external cooling integration?
Not natively. However, an optional recirculating chiller interface kit (part #GH-COOL-KIT) allows connection to third-party chillers for active cooling down to ambient +5 °C—enabling exothermic reaction control.
What is the recommended recalibration interval?
Annual verification against a NIST-traceable reference thermometer is advised. Full sensor replacement is recommended every 36 months under continuous operation at >150 °C.
Can the GH-30A be used in Class 100 cleanrooms?
Yes—provided the unit is installed outside the cleanroom envelope with only the bath lid and probe ports penetrating the wall via ISO 14644-compliant feedthroughs. Internal circulation prevents aerosol generation.
Is firmware update capability available?
Yes. Updates are distributed via secure HTTPS download and applied via USB flash drive using signed firmware binaries verified by SHA-256 checksum and RSA-2048 signature validation.
