Yiheng BWS-Series Precision Constant-Temperature Water Bath

Overview

The Yiheng BWS-Series Precision Constant-Temperature Water Bath is an engineered thermal platform designed for stable, reproducible heating in laboratory environments where precise temperature maintenance—without active circulation—is required. Operating on the principle of resistive heating with PID-controlled feedback, the bath delivers uniform thermal distribution across its stainless-steel chamber via optimized heater placement and insulated tank architecture. It is not intended for dynamic fluid mixing or external recirculation applications; rather, it serves as a passive, stationary thermal reservoir for sample immersion, reaction support, enzyme incubation, viscosity reference calibration, and auxiliary heating in analytical workflows. Its operational envelope spans from ambient +5°C up to 100°C (model-dependent), with 0.1°C resolution enabling fine-grained thermal setpoint control suitable for protocols requiring traceable, non-vibrating heat input.

Key Features

• High-contrast LCD display showing real-time temperature, setpoint, and timer status simultaneously—supporting intuitive menu-driven operation without external software.
• Single-piece deep-drawn 304 stainless-steel inner tank ensures long-term corrosion resistance, structural integrity, and ease of decontamination—critical for repeated use in biological and chemical laboratories.
• Integrated stainless-steel hinged lid with tapered “sharp-top” geometry minimizes condensation drip and reduces evaporative loss during extended operation, preserving bath volume stability and preventing cross-contamination of immersed samples.
• Hardware-based dry-run protection circuit automatically disables the heating element upon detection of low liquid level—eliminating risk of thermal runaway or tank deformation under no-load conditions.
• Standard RS-485 interface enables integration into centralized lab monitoring systems; optional USB data logging and micro-printer connectivity support manual record-keeping compliant with GLP documentation practices.

Sample Compatibility & Compliance

The BWS-Series accommodates standard glassware (e.g., beakers, flasks, test tubes) and sealed sample containers up to 200 mm in height within its 11 L or 20 L chambers. Its static bath design avoids mechanical agitation, making it compatible with delicate biological specimens, temperature-sensitive reagents, and calibration standards where shear stress must be excluded. The unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets CE marking requirements for EMC and low-voltage directives. While not certified for medical device use, its thermal stability profile supports routine QC procedures aligned with ISO/IEC 17025–accredited testing environments when operated within defined SOPs.

Software & Data Management

The embedded controller supports time-based hold functions (up to 99 hours 59 minutes) and optional multi-segment programmable temperature ramps (via upgraded LCD controller). Data output is available in ASCII format through RS-485 or USB, permitting direct import into Excel, LabVIEW, or LIMS platforms. All logged temperature readings include timestamp metadata, satisfying basic audit-trail needs for internal quality records. Though not FDA 21 CFR Part 11–compliant out-of-the-box, the system can be deployed in environments adhering to GxP principles when paired with validated third-party data acquisition software and procedural controls governing user access and data integrity.

Applications

• Enzyme activity assays requiring stable thermal incubation at 37°C, 60°C, or other defined setpoints.
• Pre-heating solvents prior to HPLC mobile phase preparation or Karl Fischer titration.
• Calibration of thermometers, RTDs, and thermocouples against NIST-traceable reference standards.
• Controlled melting point determination for polymers and pharmaceutical excipients.
• Support heating for viscometers, density meters, and refractometers that require external thermal stabilization.
• Plant physiology studies involving root-zone temperature manipulation in hydroponic setups.

FAQ

Is this water bath suitable for oil bath applications?
Yes—the stainless-steel tank and high-temperature rating (up to 100°C) allow safe use with silicone oils and mineral oils; however, users must verify oil flash point and viscosity compatibility prior to operation.
Does the unit include a built-in temperature probe calibration function?
No—calibration requires external reference thermometry per ISO 17025 guidelines; the instrument’s factory calibration certificate is provided with each shipment.
Can the timer function be used independently of temperature control?
No—the timer operates only in conjunction with active temperature control and halts heating upon completion unless manually reset.
What is the maximum recommended fill level for optimal thermal uniformity?
For 11 L models, maintain liquid level between 8–10 L; for 20 L models, 15–18 L ensures minimal surface-to-volume ratio and stable gradient performance.
Is remote monitoring supported via Ethernet or Wi-Fi?
Not natively—the system provides only RS-485 and USB interfaces; network connectivity requires an external protocol converter or industrial gateway.