Hanuo HHW420-2B Precision Constant-Temperature Water Bath
| Brand | Hanuo |
|---|---|
| Origin | Shanghai, China |
| Model | HHW420-2B |
| Rated Power | 1000 W ±10% |
| Temperature Range | RT+10°C to 100°C |
| Temperature Fluctuation | ±0.5°C |
| Temperature Uniformity | ±1.0°C |
| Chamber Dimensions (W×D×H) | 420 × 180 × 200 mm |
| Net Weight | 8.5 kg |
| Display | High-Brightness LCD |
Overview
The Hanuo HHW420-2B Precision Constant-Temperature Water Bath is an engineered thermal stabilization platform designed for laboratory-grade temperature control in applications requiring high reproducibility and operational reliability. Utilizing a resistive heating element immersed in a thermally conductive water medium, the system achieves stable thermal equilibrium through PID-controlled feedback regulation. Its operating range spans from ambient +10°C to 100°C—covering critical physiological, enzymatic, incubation, and calibration workflows across life sciences, pharmaceutical QC, materials testing, and academic research laboratories. The unit’s stainless steel inner chamber ensures long-term resistance to corrosion and chemical degradation, while its cold-rolled steel outer housing—finished with electrostatic powder coating—provides mechanical robustness and cleanroom-compatible surface integrity.
Key Features
- Microprocessor-based digital temperature controller with PID algorithm for precise setpoint tracking and minimal overshoot
- High-brightness LCD display showing real-time bath temperature, setpoint, timer status, and system alerts
- Programmable timer function enabling automated start/stop cycles up to 99 hours and 59 minutes
- Dual-stage safety protection: independent overtemperature cutoff (mechanical backup) and electronic alarm threshold at user-defined limit
- Thermally optimized chamber geometry with enhanced convection circulation for uniform heat distribution (±1.0°C spatial uniformity)
- Low thermal mass design facilitates rapid equilibration and minimizes power consumption during steady-state operation
Sample Compatibility & Compliance
The HHW420-2B accommodates standard laboratory glassware including beakers (up to 1 L), flasks, test tubes, and cuvettes. Its open-bath configuration supports immersion of probes, sensors, and reaction vessels without restriction. The unit complies with general electrical safety requirements per IEC 61010-1 for laboratory equipment. While not certified to ISO/IEC 17025 or GLP-specific validation protocols out-of-the-box, its stable thermal performance and traceable calibration capability make it suitable for use within validated workflows when paired with external NIST-traceable thermometers and documented SOPs. It meets typical institutional requirements for non-GMP auxiliary thermal support equipment in R&D and teaching labs.
Software & Data Management
This model operates as a standalone analog-digital hybrid instrument with no embedded connectivity or remote software interface. All operational parameters—including temperature setpoint, timer duration, and alarm thresholds—are configured locally via membrane keypad input. The LCD provides immediate visual confirmation of active mode, current temperature, elapsed time, and fault indicators (e.g., “OL” for overtemperature). For laboratories requiring audit trails or electronic recordkeeping, integration with external data loggers (e.g., Omega OM-CP series or Testo 177-T4) is supported via PT100 or thermistor output compatibility (optional accessory port available upon request). No FDA 21 CFR Part 11 compliance features are included; users implementing this device in regulated environments must establish manual calibration logs and maintenance records per internal quality procedures.
Applications
- Enzyme activity assays and protein denaturation studies requiring tightly controlled thermal conditions
- Cell culture media pre-warming and reagent equilibration prior to sterile handling
- Calibration of liquid-in-glass thermometers, RTDs, and thermocouples against reference standards
- Accelerated stability testing of formulations under isothermal stress conditions
- Supporting dissolution testing apparatus (e.g., USP Apparatus I/II) as auxiliary temperature source
- Teaching laboratory demonstrations of thermal kinetics, phase transitions, and heat transfer principles
FAQ
What is the minimum ambient temperature required for stable operation?
The unit is rated for operation in ambient environments between 15°C and 30°C. Below 15°C, extended warm-up times and reduced temperature stability may occur due to increased thermal load.
Can the water bath be used with solvents other than deionized water?
Only water-based fluids are recommended. Use of organic solvents, oils, or corrosive solutions voids warranty and risks damage to seals, heater sheath, and temperature sensor.
Is calibration documentation provided with the unit?
No factory calibration certificate is included. Users should perform initial verification using a NIST-traceable reference thermometer and maintain periodic recalibration logs per organizational quality policy.
Does the HHW420-2B support external temperature probe input for chamber monitoring?
No—temperature sensing is internal only. External probe integration requires third-party data acquisition hardware and custom mounting fixtures.
What maintenance is required to ensure long-term accuracy?
Regular cleaning of the stainless steel bath with mild detergent and soft cloth; annual inspection of heater terminals and gasket integrity; biannual descaling if hard water is used.
