Hanuo HN-18T-I Precision Transparent Constant-Temperature Bath

Overview

The Hanuo HN-18T-I Precision Transparent Constant-Temperature Bath is an engineered thermal platform designed for laboratories requiring high-fidelity temperature control and real-time visual monitoring of sample behavior. Utilizing a PID-controlled resistive heating system with high-stability platinum resistance thermometer (PT100) feedback, the unit maintains precise thermal equilibrium across its 18-liter working chamber. Its defining architectural feature—triple-sided borosilicate glass walls—enables unobstructed optical access to fluid dynamics, phase transitions, colorimetric reactions, and particulate dispersion without compromising thermal integrity. Unlike conventional opaque bath systems, this design supports direct observation under ambient or integrated illumination, making it especially suitable for kinetic studies, calibration validation, and teaching applications where process transparency is essential. The bath operates exclusively in heating mode and is not equipped for refrigeration; its maximum operational setpoint is 80 °C, optimized for water- and oil-based media within defined viscosity and flash-point limits.

Key Features

• Triple-sided optical-grade borosilicate glass enclosure for simultaneous top and lateral viewing of bath interior
• PID-based digital temperature controller with auto-tuning capability and 0.01 °C display resolution
• Internal recirculation pump ensuring uniform thermal distribution (±0.05 °C stability at setpoint)
• Compact desktop footprint (250 × 200 × 350 mm W×D×H) with 198 × 140 mm open bath aperture
• Heating-only architecture with overtemperature protection and dry-run safety cutoff
• Optional RS232/RS485 interface for integration with LabVIEW, MATLAB, or custom SCADA systems
• Programmable multi-segment temperature ramping (1–30 steps), supporting time-dependent thermal protocols
• External probe input port enabling dual-loop control—internal bath temperature vs. external process temperature
• Stainless steel internal tank and corrosion-resistant housing compatible with aqueous, ethylene glycol, silicone oil, and mineral oil media

Sample Compatibility & Compliance

The HN-18T-I accommodates standard laboratory vessels—including beakers, reaction flasks, cuvettes, and sensor probes—within its open-bath configuration. Its transparent construction facilitates alignment of optical instrumentation (e.g., spectrophotometers, polarimeters, or laser Doppler velocimeters) directly above or beside the bath. The unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets mechanical stability requirements per ISO 17025 Annex A for temperature calibration support. While not certified to FDA 21 CFR Part 11 out-of-the-box, audit-ready data logging (via optional software) supports GLP/GMP traceability when paired with validated third-party acquisition tools. It is routinely deployed in ASTM D1505 (density gradient column), USP environmental simulation, and ISO 13485 device stability testing workflows.

Software & Data Management

When configured with the optional communication module, the HN-18T-I supports ASCII protocol commands for remote setpoint adjustment, real-time temperature readback, and status interrogation. Compatible with Windows-based PC software (supplied separately), it enables automated data capture at user-defined intervals (1 s to 60 min), CSV export, and timestamped event logging—including ramp completion, deviation alarms, and power interruption recovery. All logged entries include operator ID fields and checksum verification to satisfy basic ALCOA+ principles. Firmware updates are delivered via USB flash drive and retain all prior calibration coefficients and user profiles.

Applications

• Calibration of liquid-in-glass thermometers, RTDs, and thermocouples against NIST-traceable references
• Temperature-dependent viscosity measurements using rotational viscometers mounted above the bath
• In situ monitoring of enzymatic reaction kinetics under controlled thermal conditions
• Thermal stress testing of optical components, thin-film coatings, and polymer films
• Pre-conditioning of reference standards prior to metrological evaluation
• Supporting distillation, extraction, and reflux procedures requiring stable heat input without vapor condensation interference
• Teaching labs demonstrating convection currents, solubility curves, and Le Chatelier’s principle

FAQ

Is the HN-18T-I suitable for oil baths?
Yes—its stainless steel tank and sealed heater assembly are compatible with silicone oils and mineral oils up to 100 °C; however, maximum recommended operating temperature remains 80 °C for long-term stability.
Does it support external temperature feedback control?
Yes—the optional external sensor port allows closed-loop regulation based on a remote probe placed in a reactor jacket or flow cell.
Can the unit be integrated into automated lab workflows?
Yes—via RS232/RS485 interface and documented command set, it interoperates with PLCs, robotic arms, and centralized LIMS platforms.
What is the warranty and service coverage?
Hanuo provides a 24-month limited warranty covering parts and labor; extended calibration certification and on-site maintenance contracts are available upon request.
Is the glass resistant to thermal shock?
The borosilicate glass panels are rated for ≤100 K/min thermal gradient; rapid immersion of cold samples is discouraged to preserve optical clarity and structural longevity.