MEMMERT WNB10 Precision Water Bath

Overview

The MEMMERT WNB10 is a high-precision, laboratory-grade water bath engineered for stable thermal control in critical applications requiring reproducible temperature maintenance across extended durations. Operating on the principle of convective heat transfer via a fully immersed, thermostatically regulated water medium, the WNB10 delivers uniform thermal distribution with minimal spatial gradient (< ±0.2 °C at 37 °C, measured per DIN 12879). Its design adheres to the functional safety requirements of IEC 61010-1 for electrical equipment used in laboratory environments, ensuring compatibility with GLP-compliant workflows in pharmaceutical development, clinical diagnostics, biochemical assay incubation, and materials testing laboratories.

Key Features

• High-fidelity temperature regulation using PID algorithm with adaptive tuning—optimized for both rapid ramp-up and long-term stability at setpoints from 10 °C to 95 °C (with dedicated 100 °C boil mode)
• Dual independent 4-wire Pt100 resistance thermometers (E-type model) enabling real-time cross-verification of bath temperature and eliminating lead-wire resistance error; single 4-wire Pt100 in B-type configuration
• Triple-stage overtemperature protection system (E-type): (1) primary electronic cut-off at +10 °C above setpoint, (2) user-configurable secondary electronic limit (TWW/TWB), and (3) fail-safe mechanical thermostat (TB) actuating at +30 °C above maximum rated bath temperature
• Intuitive LED interface with alarm status indicators, programmable time-based operation modes including immediate start, delayed start, hold duration, and time-dependent temperature profiling (E-type only)
• AISI 316 stainless steel bath chamber and outer housing—resistant to corrosion from saline solutions, organic solvents, and repeated sterilization cycles; seamless welds and rounded internal corners facilitate cleaning and validation
• Integrated circulation pump (standard on WB10 variant) ensures homogeneous temperature distribution and minimizes stratification—critical for multi-vessel experiments and kinetic studies

Sample Compatibility & Compliance

The WNB10 accommodates standard laboratory vessels—including conical flasks (100–500 mL), test tubes (14.5–32 mm diameter), and custom jigs—via optional stainless-steel support accessories. Its 10 L capacity and 350 × 210 mm internal footprint allow simultaneous processing of up to 110 × 14.5 mm tubes or 5 × 500 mL Erlenmeyer flasks. All configurations comply with ISO/IEC 17025 metrological traceability requirements when paired with NIST-traceable calibration services. The unit meets EN 61000-6-3 (emission) and EN 61000-6-4 (immunity) standards for electromagnetic compatibility and carries full CE marking under the EU Low Voltage Directive (2014/35/EU) and EMC Directive (2014/30/EU).

Software & Data Management

While the WNB10 operates as a standalone instrument, its E-type controller supports optional RS485 Modbus RTU communication for integration into centralized lab monitoring systems (e.g., LabVantage, Thermo Fisher SampleManager). Time-stamped temperature logs (interval: 1–60 min, user-selectable) can be exported via USB port for audit-ready documentation. All parameter changes—including setpoint, timer, and alarm thresholds—are recorded with timestamp and operator ID when connected to compliant LIMS or ELN platforms supporting FDA 21 CFR Part 11 electronic signature protocols.

Applications

• Enzyme kinetics and protein denaturation studies requiring precise thermal ramping and plateau maintenance
• Cell culture media pre-warming and reagent equilibration prior to sterile handling
• USP sterility test sample incubation and membrane filtration rinse temperature control
• ASTM D1298 density determinations and ASTM D86 distillation receiver bath conditioning
• QC/QA thermal validation of dissolution apparatus water jackets (per USP )
• Accelerated stability testing per ICH Q1A(R2) guidelines under controlled aqueous thermal stress

FAQ

Is the WNB10 suitable for use with organic solvents?

The WNB10 is designed exclusively for aqueous media. For non-aqueous applications (e.g., silicone oil, ethylene glycol), MEMMERT’s OB10 oil bath variant—featuring identical control architecture and enhanced thermal insulation—is recommended.
Can the WNB10 be validated for GMP environments?

Yes. Its construction, sensor redundancy (E-type), alarm logging, and compliance with EN 61010-1 make it suitable for IQ/OQ/PQ execution. Full validation documentation kits—including URS templates, test protocols, and calibration certificates—are available upon request.
What is the maximum allowable ambient temperature for continuous operation?

The unit must be installed in an environment where ambient temperature remains ≤ 30 °C and relative humidity ≤ 80 % non-condensing to ensure thermal management integrity and avoid derating of heating performance.
Does the circulation pump require maintenance?

The integrated centrifugal pump is sealed and maintenance-free for the rated service life (≥ 20,000 operating hours). Annual inspection of impeller clearance and seal integrity is advised during routine calibration.
Are third-party accessories compatible with the WNB10 mounting interface?

Only MEMMERT-certified accessories (e.g., L-series racks, N-series tube holders) guarantee dimensional tolerance, thermal stability, and mechanical safety. Non-OEM components may compromise temperature uniformity and void warranty coverage.