YiHeng BWS-10 Dual-Function Constant-Temperature Water Bath & Immersion Circulator

Overview

The YiHeng BWS-10 is an integrated constant-temperature water bath and immersion circulator engineered for precision thermal control in routine laboratory applications. Designed around a robust convection-based heating architecture, it maintains stable temperature uniformity across its 300 × 240 × 150 mm stainless steel chamber using resistive heating elements coupled with internal recirculation—ensuring minimal thermal stratification and rapid equilibration. Unlike open-bath configurations, the BWS-10’s sealed operational envelope, combined with optional vapor-resistant conical lid and adjustable aperture plate, mitigates evaporation loss and minimizes cross-contamination risk during extended incubation or sample conditioning tasks. Its heating-only operation (RT+5 °C to 99 °C) aligns with standard protocols requiring non-refrigerated thermal stabilization, including enzyme activity assays, media preparation, dissolution testing, and calibration of temperature-sensitive probes.

Key Features

• Single-unit dual functionality: operates as both a static water bath and a circulation-enabled thermal immersion platform without hardware modification.
• One-piece drawn stainless steel inner tank ensures structural integrity, corrosion resistance, and ease of cleaning—critical for GLP-compliant environments where residue accumulation must be avoided.
• LCD interface displays real-time bath temperature, setpoint, timer status, and system alerts simultaneously; menu-driven navigation supports intuitive setup without training overhead.
• Integrated safety architecture includes three-tier thermal protection: dry-run cutoff (immediate heater deactivation upon low-fluid detection), independent over-temperature alarm circuitry, and deviation monitoring (±X °C configurable threshold).
• Modular accessory support: removable stainless steel mesh shelf shields heaters and PT100 sensors from mechanical impact; adjustable beaker aperture plate accommodates vessels from 10 mL test tubes to 1 L Erlenmeyer flasks.
• Optional conical lid reduces surface condensation ingress and suppresses evaporation by >40% under continuous 8-hour operation at 85 °C—validated per ASTM E2912-22 guidelines for thermal stability assessment.

Sample Compatibility & Compliance

The BWS-10 accommodates a broad range of sample containers—including glassware, polypropylene vials, and stainless steel holders—within its open-top chamber. Its flat-bottom geometry and uniform heat distribution support ISO 17025-aligned validation of thermal homogeneity (±0.3 °C typical deviation across chamber volume at 37 °C). The unit complies with IEC 61010-1:2010 for laboratory electrical equipment safety and meets CE marking requirements for electromagnetic compatibility (EN 61326-1). While not certified for FDA 21 CFR Part 11 compliance out-of-the-box, its optional programmable controller supports audit-trail logging when integrated with validated LIMS platforms—enabling traceability in regulated QC/QA workflows.

Software & Data Management

The base model operates via embedded firmware with local timer-based scheduling (0–999 min). When equipped with the optional multi-stage programmable controller, users gain access to up to 30 segmented ramp/soak profiles, RS-232 serial output for external data logging, and password-protected parameter locking—facilitating SOP adherence in shared lab environments. All temperature events (setpoint changes, alarms, power interruptions) are timestamped in non-volatile memory, supporting retrospective analysis during internal audits or CAPA investigations.

Applications

• Biological incubation: cell culture media pre-warming, serum thawing, and antibody dilution buffer equilibration.
• Pharmaceutical testing: USP dissolution apparatus water bath qualification, gelatin capsule softening studies.
• Materials science: polymer melt conditioning prior to rheological measurement, viscosity reference standard stabilization.
• Calibration support: thermal verification of thermocouples, RTDs, and digital thermometers per ISO/IEC 17025 Clause 6.5.2.
• Educational labs: reproducible kinetics experiments requiring precise thermal initiation (e.g., iodine clock reaction, enzyme Michaelis-Menten assays).

FAQ

Does the BWS-10 support refrigeration or cooling functions?

No. It is a heating-only system with a minimum operating temperature of ambient +5 °C.
Can the internal recirculation be disabled for static bath use?

Yes. The pump is independently controllable via front-panel toggle switch.
Is the stainless steel tank electropolished or passivated?

The inner tank undergoes standard acid passivation per ASTM A967 to enhance corrosion resistance in aqueous saline or buffered solutions.
What is the maximum recommended fill level for optimal thermal performance?

For uniformity and safety, maintain liquid level between 80–100 mm above the heater element—approximately 8–10 L capacity within the specified chamber dimensions.
Are calibration certificates available for purchase?

Yes. NIST-traceable temperature calibration reports (at 37 °C, 60 °C, and 85 °C) can be ordered separately with documented uncertainty budgets per ISO/IEC 17025.