ZiQi HH-W420 Digital Triple-Function Constant-Temperature Water Bath

Overview

The ZiQi HH-W420 Digital Triple-Function Constant-Temperature Water Bath is a benchtop thermal management system engineered for precision heating, sterilization, and sample conditioning in academic, industrial, and clinical laboratory environments. Based on resistive immersion heating and PID-based digital temperature regulation, the HH-W420 maintains stable thermal conditions within a stainless-steel water chamber without forced circulation—making it suitable for applications where gentle, uniform conductive heating is required, such as enzyme incubation, reagent warming, solvent evaporation, and boiling disinfection of glassware and instruments. Its triple-function design integrates capabilities traditionally associated with water baths, temperature-controlled incubation chambers, and low-temperature sterilizers, eliminating the need for multiple dedicated units in resource-constrained labs.

Key Features

• Triple-function operational mode: configurable as a water bath, temperature-stabilized warming chamber, or boiling sterilizer (100°C operation)
• Full 304 stainless-steel interior chamber ensures long-term corrosion resistance against aqueous solutions, mild acids, and alkaline buffers
• Digital LED display with 0.1°C resolution and real-time temperature readout enables precise setpoint verification and process documentation
• PID temperature controller delivers ±0.5°C stability across the full operating range (RT+5°C to 100°C), minimizing thermal overshoot and drift during extended runs
• Robust cold-rolled steel exterior with electrostatic epoxy powder coating provides mechanical durability and chemical resistance in shared lab spaces
• Over-temperature safety cutoff prevents uncontrolled heating and complies with IEC 61010-1 Class II electrical safety requirements
• 1.5 kW heating element optimized for rapid warm-up and sustained thermal output in the 420 × 180 × 200 mm chamber volume

Sample Compatibility & Compliance

The HH-W420 accommodates standard laboratory glassware including beakers (up to 1 L), Erlenmeyer flasks, test tube racks, and sterilization trays. Its open-bath geometry supports direct immersion of samples or indirect heating via secondary containers. The unit meets general-purpose laboratory safety standards under GB/T 29812–2013 (Chinese national standard for constant-temperature equipment) and conforms to electromagnetic compatibility (EMC) requirements per GB/T 18268.21–2010. While not certified for GMP or ISO 17025 traceable calibration out-of-the-box, its digital control architecture supports external validation using NIST-traceable thermistors or PT100 probes. For GLP-regulated workflows, users may implement manual logbook entries or integrate third-party data acquisition systems for audit-ready temperature records.

Software & Data Management

The HH-W420 operates via embedded firmware with no proprietary software dependency. All configuration—including setpoint adjustment, timer activation (if equipped), and alarm thresholds—is performed through front-panel membrane keys and displayed on the integrated 4-digit LED screen. No USB, RS-232, or Ethernet interface is provided; therefore, automated data logging requires external hardware (e.g., USB thermocouple interfaces paired with LabVIEW or Python-based DAQ scripts). The absence of network connectivity aligns with air-gapped lab environments where cybersecurity and instrument isolation are prioritized. Firmware updates are not supported—the device is designed for long-term mechanical and electronic stability rather than feature iteration.

Applications

• Chemical synthesis: preheating solvents prior to reflux, controlled evaporation of reaction mixtures, and temperature-sensitive crystallization protocols
• Biological sample preparation: warming culture media, thawing frozen reagents, and equilibrating enzymatic assay components
• Clinical and microbiology labs: boiling disinfection of forceps, pipette tips, and glass slides (validated at 100°C for ≥10 minutes per WHO HTM 01-05 guidelines)
• Pharmaceutical QC: dissolution medium temperature conditioning per USP , extract concentration, and gelatin capsule softening studies
• Materials testing: thermal aging of polymer films, viscosity benchmarking of oils and lubricants, and accelerated stability trials of adhesives
• Educational use: undergraduate thermodynamics experiments, calorimetry demonstrations, and kinetics lab modules requiring reproducible thermal platforms

FAQ

Is the HH-W420 suitable for oil bath applications?
No—the chamber is designed exclusively for aqueous media. Use of oils or organic solvents may degrade seals, impair temperature uniformity, and pose fire hazards due to the lack of overheat protection beyond 100°C.
Does the unit include a drain valve?
No—emptying requires manual tilting or siphoning. A drain port is not integrated into the base structure.
Can the temperature sensor be calibrated by the user?
Yes—sensor offset adjustment is accessible via service mode (detailed in the technical manual), allowing field correction against a reference thermometer per ISO/IEC 17025 Clause 6.5.
What is the typical warm-up time from 25°C to 80°C?
Approximately 22–26 minutes under standard ambient conditions (23°C, still air), depending on fill level and cover usage.
Is the HH-W420 compliant with FDA 21 CFR Part 11?
No—it lacks electronic audit trails, user authentication, and secure data export functionality required for Part 11 compliance. It is intended for non-GxP research or preparatory workflows only.