Shanghai Yiheng BW/BWS Series Precision Constant-Temperature Water Bath with Magnetic Drive Circulator

Overview

The Shanghai Yiheng BW and BWS Series Precision Constant-Temperature Water Baths are engineered for laboratory-grade thermal stability in applications requiring accurate, reproducible heating and temperature maintenance of samples immersed in liquid media. Designed for direct immersion or external circulation (via optional magnetic-drive pump in BWS models), these units operate on a robust PID-controlled resistive heating principle, delivering precise thermal energy transfer to water or compatible heat-transfer fluids. Unlike conventional domestic-grade baths, the BW/BWS series incorporates industrial-grade safety architecture—including independent dry-run detection circuitry and redundant high-limit thermal fuses—to prevent heater damage or hazardous thermal runaway under low-fluid conditions. The bath’s stainless-steel, one-piece deep-drawn inner tank eliminates seam-related corrosion and facilitates GLP-compliant cleaning and validation. Its RT+5°C to 100°C operational envelope supports a broad spectrum of biochemical incubation, viscosity calibration, reaction kinetics studies, and material conditioning protocols common in academic, pharmaceutical, and quality control laboratories.

Key Features

• One-piece, seamless 304 stainless-steel inner tank—resistant to corrosion, easy to sanitize, and compliant with ISO 15190:2020 laboratory equipment surface requirements.
• Dual-layer safety system: real-time fluid-level monitoring cuts power to heaters upon detected low-level condition; independent mechanical high-limit thermostat provides fail-safe thermal cutoff.
• Backlit LCD interface with multi-parameter display (setpoint, actual temperature, timer status); menu-driven navigation enables intuitive operation without external software.
• Optional programmable controller available (not standard) supporting up to 30 segments for time-temperature profiling—suitable for ASTM D2196 or ISO 2555 viscosity pre-conditioning sequences.
• Stainless-steel tapered lid minimizes evaporation and condensation ingress, preserving sample integrity during extended operation.
• Internal recirculation loop ensures uniform temperature distribution (±0.2°C stability at setpoint), validated per ISO/IEC 17025 calibration traceability guidelines.

Sample Compatibility & Compliance

These water baths accommodate standard laboratory glassware (e.g., beakers, flasks, cuvettes) and immersion probes up to 200 mm depth. Compatible working fluids include deionized water, glycerol–water mixtures (for sub-zero operation with antifreeze additives), and silicone oils (within specified temperature limits). The unit meets CE marking requirements for electromagnetic compatibility (EN 61326-1) and low-voltage safety (EN 61010-1). While not certified to FDA 21 CFR Part 11 out-of-the-box, audit-ready data logging (via optional RS-485 or USB interface) supports GMP/GLP documentation workflows when integrated with validated third-party acquisition software. All electrical components conform to IP20 enclosure rating per IEC 60529.

Software & Data Management

The base configuration operates as a stand-alone instrument with no embedded operating system. Optional communication interfaces—including RS-485 (Modbus RTU protocol) and USB virtual COM port—enable integration into centralized lab management systems (LIMS) or SCADA platforms. When paired with compliant data acquisition software, users can generate timestamped temperature logs with operator ID, event flags (e.g., “dry-run triggered”, “high-limit activated”), and digital signatures meeting ALCOA+ data integrity principles. Firmware updates are performed manually via USB stick; no remote connectivity or cloud dependency is implemented, ensuring network isolation for regulated environments.

Applications

• Calibration of thermometers, RTDs, and thermocouples per ISO/IEC 17025 Clause 6.5.
• Pre-conditioning of polymer melts and resins prior to rheological testing (ASTM D3835).
• Enzyme activity assays requiring stable thermal environments (e.g., ELISA plate incubation at 37°C).
• Accelerated stability testing of pharmaceutical formulations (ICH Q1A).
• Thermal equilibration of reference standards for differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA).
• Supporting role in ASTM E2251-22 liquid-in-glass thermometer calibration procedures.

FAQ

Does this water bath support external circulation to auxiliary equipment?
Yes—models designated “BWS” include an integrated magnetic-drive circulation pump rated for continuous duty at flow rates up to 12 L/min (at zero head); tubing connections comply with ISO 8536-4 for medical-grade silicone hose compatibility.
Can the unit be validated for ISO/IEC 17025 accreditation?
Yes—the bath’s temperature stability (±0.2°C), resolution (0.1°C), and repeatability meet minimum performance criteria outlined in EURACHEM/CITAC Guide CG4 for thermal calibration equipment; full validation requires user-performed IQ/OQ/PQ protocols.
Is dry-run protection active during timer-based operation?
Yes—the fluid-level sensor operates independently of timer status and interrupts heating immediately upon detection of insufficient liquid volume, regardless of whether the unit is in timed or continuous mode.
What materials are used in wetted components?
All primary wetted surfaces—including tank, lid, heater sheath, and pump housing (BWS models)—are constructed from AISI 304 stainless steel; gaskets are FDA-compliant silicone (USP Class VI).
Are calibration certificates provided with shipment?
Factory calibration reports (traceable to NIM, China) are included; accredited calibration certificates (CNAS or UKAS) are available upon request at additional cost and require lead time for third-party verification.