Hanuo HNW-D-2 Precision Digital Water Bath with LCD Display

Overview

The Hanuo HNW-D-2 Precision Digital Water Bath is an engineered laboratory thermal platform designed for stable, reproducible temperature control in routine and quality-critical applications. Utilizing resistive immersion heating combined with PID-controlled feedback regulation and a high-contrast backlit LCD interface, this dual-port water bath maintains precise setpoint accuracy across its full operating range—from ambient temperature up to 100°C. Its stainless steel inner chamber and insulated housing minimize thermal loss and ensure consistent heat distribution throughout the bath medium, enabling reliable sample incubation, enzymatic reactions, dissolution testing, and calibration procedures in compliance with standard laboratory workflows.

Key Features

• Dual independent wells with identical temperature control logic—enabling parallel processing of two separate samples or protocols without cross-interference
• LCD display with intuitive menu navigation and real-time readout of setpoint, actual temperature, and operational status
• PID temperature controller delivering ≤ ±0.5°C stability and ≤ ±1.0°C uniformity across the entire working volume
• Stainless steel tank construction (304 grade) for corrosion resistance, ease of cleaning, and long-term durability in aqueous environments
• Over-temperature protection circuitry with automatic cut-off to prevent dry-run damage or sample degradation
• Adjustable leveling feet and non-slip rubber base for stable placement on laboratory benches under vibration-sensitive conditions
• Front-panel access to calibration offset adjustment—supporting traceable temperature verification per ISO/IEC 17025 requirements

Sample Compatibility & Compliance

The HNW-D-2 accommodates standard laboratory glassware including beakers (up to 1000 mL), test tubes (12–25 mm diameter), flasks, and cuvettes. Its 300 mm × 160 mm × 130 mm internal chamber supports both vertical and horizontal sample orientation. The unit complies with IEC 61010-1:2010 safety standards for electrical equipment used in laboratory environments. While not certified for medical device manufacturing, it meets general-purpose GLP (Good Laboratory Practice) requirements for temperature-controlled sample handling. Documentation includes factory calibration certificate (NIST-traceable reference probe), CE marking, and RoHS-compliant materials declaration.

Software & Data Management

The HNW-D-2 operates as a standalone analog-digital hybrid instrument with no embedded firmware-based data logging. However, its analog output (0–5 V DC proportional to measured temperature) is compatible with external DAQ systems (e.g., National Instruments USB-6009, Keysight 34972A) for time-stamped temperature acquisition and CSV export. Optional RS-232 interface (available via accessory module) enables integration into LabVIEW or Python-controlled automation sequences. All configuration parameters—including setpoint, alarm thresholds, and calibration offsets—are retained after power cycling. Audit trails are maintained manually per lab SOP; for 21 CFR Part 11 compliance, integration with validated third-party LIMS or ELN platforms is recommended.

Applications

• Enzyme kinetics studies requiring strict thermal consistency during substrate incubation
• Pharmaceutical dissolution testing (USP Apparatus I & II water jacket temperature maintenance)
• Biochemical assay preparation—including DNA denaturation/annealing steps and antibody dilution staging
• Calibration of liquid-in-glass thermometers and digital probes against reference standards
• Material testing of polymers and adhesives where controlled thermal aging is required
• Environmental simulation for stability studies per ICH Q1A(R2) guidelines
• Pre-warming reagents prior to chromatographic injection or spectrophotometric analysis

FAQ

What is the maximum recommended fill level for the HNW-D-2 bath chamber?

Fill the chamber to within 20 mm below the top rim to ensure optimal convection circulation and avoid overflow during thermal expansion.
Can the HNW-D-2 operate continuously for 72+ hours?

Yes—designed for unattended operation with thermal cutoff and stable PID performance over extended cycles; however, periodic visual inspection of water level and heater integrity is advised.
Is distilled water mandatory for use?

Deionized or distilled water is strongly recommended to prevent mineral scale buildup on the heating element and chamber walls, especially above 60°C.
Does the unit support external temperature probe input for chamber monitoring?

No—the internal Pt100 sensor is fixed; external probe integration requires optional RS-232 or analog output modules.
What is the warm-up time to reach 37°C from ambient (25°C)?

Approximately 12–15 minutes under standard load conditions (filled with 4.5 L water, no sample load).