Hanuo HHW-420 Digital Triple-Function Constant-Temperature Water Bath
| Brand | Hanuo |
|---|---|
| Model | HHW-420 |
| Chamber Dimensions (L×W×H) | 420 × 180 × 200 mm |
| Temperature Range | Ambient to 100 °C |
| Heating Power | 1000 W |
| Temperature Control Accuracy | ±0.5 °C |
| Construction | Stainless Steel Interior Chamber |
| Application Types | Water Bath, Temperature-Controlled Incubation, Boiling Sterilization |
Overview
The Hanuo HHW-420 Digital Triple-Function Constant-Temperature Water Bath is an engineered laboratory workhorse designed for reproducible thermal management across multiple experimental workflows. Based on resistive immersion heating and PID-controlled feedback regulation, it maintains stable liquid-phase temperature environments within a calibrated range of ambient to 100 °C — suitable for applications requiring precise thermal input without direct flame or dry-heat exposure. Its triple-function architecture integrates the operational roles of a standard water bath, a low-temperature incubation chamber, and a boiling sterilizer — eliminating the need for separate units in resource-constrained labs or quality control settings where space, budget, and procedural efficiency are critical factors.
Key Features
- Stainless steel interior chamber (304 grade) ensures long-term resistance to corrosion from aqueous reagents, saline solutions, and repeated sterilization cycles.
- Digital LED temperature display with real-time readout and intuitive push-button interface enables rapid setpoint adjustment and immediate verification of operational status.
- PID-based temperature controller delivers consistent thermal stability with ±0.5 °C accuracy across the full operating range, minimizing thermal drift during extended runs.
- 1000 W high-efficiency heating element provides rapid warm-up times and sustained thermal output even under partial load or ambient fluctuations.
- Over-temperature protection circuit automatically deactivates heating if sensor feedback exceeds preset safety limits — complying with IEC 61010-1 Class II safety requirements for laboratory equipment.
- Compact footprint (420 × 180 × 200 mm) supports benchtop integration in ISO-certified cleanrooms, GLP-compliant QC laboratories, and teaching lab configurations.
Sample Compatibility & Compliance
The HHW-420 accommodates standard laboratory glassware including Erlenmeyer flasks (up to 2 L), beakers (up to 1 L), test tube racks, and stainless steel instrument trays. Its open-bath design permits direct immersion of samples, sensors, or reaction vessels while maintaining uniform convective heat transfer. The unit meets general-purpose safety and electromagnetic compatibility standards per EN 61326-1 for measurement and control equipment. While not certified for medical device sterilization under ISO 17665, it supports boiling disinfection protocols aligned with CDC-recommended time–temperature guidelines (e.g., ≥100 °C for ≥10 minutes). For regulated environments, its digital temperature logging capability (when paired with external data loggers) supports audit-ready documentation per FDA 21 CFR Part 11 when validated as part of a broader SOP framework.
Software & Data Management
The HHW-420 operates as a standalone analog-digital hybrid system with no embedded firmware or network connectivity. Temperature setpoints and current readings are displayed locally only; however, the unit includes a 0–5 V analog output port (optional accessory) compatible with third-party data acquisition systems (e.g., National Instruments DAQ, LabVIEW, or PLC-based SCADA platforms). This allows integration into centralized lab monitoring networks for trend analysis, alarm triggering, and electronic batch record generation — essential for GMP-aligned manufacturing support labs conducting extractables/leachables studies or stability testing under ICH Q1 guidelines.
Applications
- Controlled evaporation and solvent removal in preparative chemistry workflows.
- Enzyme activity assays requiring strict thermal consistency between replicates.
- Pre-incubation of culture media prior to microbial inoculation in microbiology QA/QC.
- Thermal equilibration of calibration standards (e.g., viscosity reference oils, pH buffers) before metrological use.
- Boiling disinfection of reusable pipette tips, forceps, and glass slides in teaching and diagnostic labs.
- Supporting ASTM D1217 (density of liquids), ASTM D891 (specific gravity), and USP environmental conditioning protocols.
FAQ
Is the HHW-420 suitable for continuous operation at 100 °C?
Yes — the unit is rated for uninterrupted operation at maximum setpoint, provided adequate ventilation and water level maintenance are ensured.
Can it be used with corrosive solvents like acetone or chloroform?
No — the bath medium must be water or water-miscible, non-volatile, non-corrosive aqueous solutions. Organic solvents may damage seals and compromise temperature sensor integrity.
Does it include a timer function?
No — timing must be managed externally using laboratory timers or integrated process controllers.
What calibration documentation is supplied?
A factory-verified temperature calibration certificate (traceable to NIM China) is included, with verification points at 37 °C, 60 °C, and 100 °C.
Is it compatible with external temperature probes for independent verification?
Yes — the bath chamber allows insertion of PT100 or thermistor probes through designated access ports for parallel validation during IQ/OQ qualification.
