Hanuo HN-G1A Transparent Constant-Temperature Oil Bath

Overview

The Hanuo HN-G1A Transparent Constant-Temperature Oil Bath is an engineered thermal platform designed for precision temperature control in laboratory-scale chemical synthesis, materials testing, calibration of thermometric devices, and high-temperature physical property measurements. Unlike conventional opaque bath systems, the HN-G1A features triple-sided borosilicate glass walls—chemically resistant, thermally stable, and optically clear—enabling real-time visual monitoring of sample behavior, fluid dynamics, phase transitions, and reaction progress within the heated medium. It operates on resistive heating with a PID-controlled feedback loop, delivering stable thermal conditions from ambient up to 300 °C in inert oil or silicone-based heat transfer fluids. The unit is not intended for water use above 100 °C; operation at elevated temperatures requires compatible high-flash-point oils (e.g., Dow Corning 200 Fluid, Sigma-Aldrich Heat Transfer Oil #H9524) and appropriate ventilation per OSHA 1910.1200 guidelines.

Key Features

• Triple-sided transparent borosilicate glass tank (front + left + right), enabling unobstructed optical access for video recording, colorimetric analysis, and observation of convection currents or precipitate formation.
• Stainless steel structural frame with integrated thermal insulation, minimizing external surface temperature rise and improving energy efficiency.
• PID digital temperature controller with dual-display interface: simultaneous readout of setpoint and actual bath temperature, resolution 0.1 °C, adjustable ramp rate and hold time via front-panel keys.
• Internal recirculation pump (non-submersible, magnetically coupled) ensures uniform thermal distribution throughout the 10 L working volume, reducing axial and radial gradients to ≤±0.1 °C under steady-state conditions.
• Compact desktop footprint (W × D × H ≈ 360 × 360 × 480 mm), optimized for integration into fume hoods, glove boxes, or multi-instrument workstations.
• Over-temperature cut-off protection (independent mechanical thermostat), ground-fault circuit interrupter (GFCI) compatibility, and CE-compliant electrical safety design (EN 61010-1).

Sample Compatibility & Compliance

The HN-G1A accommodates standard laboratory glassware including round-bottom flasks (up to 2 L), jacketed reactors, viscometer spindles, and capillary viscosimeters. Its open-top configuration supports immersion probes, thermocouples (Type K or Pt100), and optical fibers for in-situ spectroscopic coupling. The bath is compatible with silicone oils (e.g., viscosity grades 10–100 cSt), mineral oils (flash point >300 °C), and glycol-based heat transfer fluids—provided they meet ASTM D445 (kinematic viscosity) and ASTM D92 (Cleveland Open Cup flash point) specifications. While not certified for GMP or GLP environments out-of-the-box, the system supports audit-ready documentation when paired with validated calibration procedures (e.g., ISO/IEC 17025 traceable NIST-traceable RTDs) and optional data logging accessories.

Software & Data Management

The HN-G1A operates as a standalone analog-digital hybrid instrument with no embedded firmware or network interface. Temperature data is accessible only via the front-panel LED display. For automated recording, users may integrate external USB data loggers (e.g., Omega OM-DAQPRO-5300) connected to PT100 or thermocouple inputs, compliant with FDA 21 CFR Part 11 when used with electronic signature-capable software platforms (e.g., LabVIEW or MATLAB with proper validation). Optional RS-485 communication modules (sold separately) enable Modbus RTU protocol integration into SCADA or LIMS environments—subject to third-party driver validation.

Applications

• Calibration of liquid-in-glass thermometers, bimetallic thermometers, and RTD sensors against reference standards per ASTM E77 and ISO 17025.
• Controlled-temperature solvent reflux in organic synthesis, particularly for reactions requiring extended dwell times above 200 °C (e.g., Friedel-Crafts acylation, polycondensation).
• Viscosity measurement using capillary or rotational viscometers where bath-induced thermal drift must be minimized (ASTM D445, ISO 3104).
• Thermal aging studies of polymers, adhesives, and encapsulants per IPC-TM-650 2.6.25 and MIL-STD-883 Method 1008.
• Pre-heating and temperature equilibration of substrates prior to thin-film deposition (e.g., spin coating, dip coating) in semiconductor R&D labs.

FAQ

Is the HN-G1A suitable for water-based applications?
No. This unit is engineered exclusively for use with high-boiling-point, low-volatility heat transfer media. Water is strictly prohibited above 100 °C due to pressure buildup, boiling instability, and accelerated corrosion.
Can external temperature probes be connected to improve accuracy?
Yes. A calibrated PT100 probe (Class A, 1/3 DIN tolerance) can be immersed directly in the bath fluid and connected to an external readout device. The internal sensor remains active for closed-loop control.
Does the unit comply with electromagnetic compatibility (EMC) directives?
Yes. The HN-G1A meets EN 61326-1:2013 for laboratory equipment immunity and emissions, verified during factory testing with full test reports available upon request.
What maintenance is required for long-term stability?
Annual verification of temperature uniformity (per ASTM E1137) and recalibration of the internal sensor using a traceable reference thermometer are recommended. Oil level and pump impeller integrity should be inspected before each high-temperature campaign.
Is custom tank geometry available?
Yes. Hanuo offers OEM engineering support for modified dimensions, alternative viewing window configurations (e.g., quartz for UV transparency), and auxiliary ports for gas purging or vacuum connections—subject to minimum order quantities and lead-time confirmation.