Memmert WTB Series Water Bath Circulators

Overview

The Memmert WTB Series Water Bath Circulators are precision-engineered thermostatic systems designed for stable, uniform temperature control in laboratory and industrial applications requiring high reproducibility. Based on a robust Peltier-free resistive heating architecture with integrated Pt100 sensor feedback and PID-controlled power regulation, the WTB series delivers consistent thermal performance across its full operating range (10–100 °C). Unlike open-bath water baths, the WTB units feature a sealed, insulated stainless-steel bath chamber with internal recirculation—ensuring homogeneous temperature distribution (<0.1 °C stability at setpoint) without external pump connections or risk of evaporation-induced drift. The system operates exclusively in heating mode and is optimized for use with water or silicone oil as heat-transfer media, supporting both static immersion and dynamic circulation protocols.

Key Features

• German-engineered construction with stainless-steel bath tank and corrosion-resistant housing for long-term reliability in demanding lab environments
• Pt100 Class A temperature sensor integrated directly into the bath fluid path, enabling real-time feedback and adaptive PID control
• Digital touch interface with intuitive menu navigation, dual-display (setpoint/actual), and programmable ramp-hold profiles
• Integrated drain valve with quick-release mechanism for rapid, spill-free bath emptying—critical for routine maintenance and media changeovers
• Modular accessory compatibility including universal sample racks, immersion thermometers, calibration ports, and external temperature probe inputs
• Passive thermal insulation and low-power standby mode reduce energy consumption while maintaining ambient-ready readiness

Sample Compatibility & Compliance

The WTB series accommodates a broad spectrum of sample formats—including glass vials, metal plates, polymer substrates, nutrient broth flasks, and sensor calibration fixtures—without compromising thermal homogeneity. Its sealed bath design prevents contamination ingress and minimizes fluid loss during extended operation. All models comply with IEC 61010-1:2010 for electrical safety in laboratory equipment and meet CE marking requirements under the EU Machinery Directive. While not intrinsically rated for explosive atmospheres, the units are suitable for GLP-compliant workflows when used with documented calibration records and traceable reference standards (e.g., NIST-traceable thermometers). Optional factory calibration certificates (DIN EN ISO/IEC 17025 accredited) are available upon request.

Software & Data Management

The WTB series supports optional RS232 or USB connectivity for integration into centralized lab management systems. When paired with Memmert’s optional ComSoft 5 software, users can log temperature profiles, generate audit trails, export CSV-formatted datasets, and configure alarm thresholds with timestamped event logging. Data integrity features include user-level access control, electronic signature prompts, and automatic backup to external storage—supporting compliance with FDA 21 CFR Part 11 requirements where validated configurations are implemented. No cloud dependency; all data remains on-premise unless explicitly routed through secure institutional IT infrastructure.

Applications

• Preparation and stabilization of emulsions, ointments, and viscous formulations in pharmaceutical development labs
• Thermal conditioning of polymer films, composite laminates, and printed circuit boards prior to mechanical testing
• Calibration of RTDs, thermocouples, and infrared sensors against traceable reference baths
• Enzyme activity assays, microbial growth studies, and cell culture pre-warming protocols requiring precise thermal equilibration
• Accelerated aging tests per ASTM D573 and ISO 188 for rubber and elastomer materials
• Standardized dissolution media heating in USP Apparatus I/II validation procedures

FAQ

What temperature media are compatible with the WTB series?
Water and silicone-based heat-transfer oils (e.g., Dow Corning 200 Fluid) are approved. Mineral oils and glycols are not recommended due to oxidation risks and potential seal degradation.
Is external circulation possible with the WTB units?
No—the WTB series provides internal recirculation only. For external loop applications, consider Memmert’s larger Heto or Julabo-compatible circulators with dual-port manifolds.
Can the WTB be used for cooling below ambient temperature?
No. The WTB is a heating-only system. Cooling functionality requires a separate chiller or a dual-temperature circulator such as the Memmert ICW series.
How often should the unit be recalibrated?
Annual calibration is recommended for GLP/GMP environments. In non-regulated settings, verification using a traceable reference thermometer before each critical experiment satisfies best-practice guidelines.
Are replacement parts and service support available globally?
Yes—Memmert maintains an international network of authorized service centers and distributes genuine spare parts (e.g., heaters, sensors, control boards) with documented traceability and warranty coverage.