Memmert WNB29 Precision Water Bath
| Origin | Germany |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | WNB29 |
| Pricing | Upon Request |
Overview
The Memmert WNB29 is a high-precision, thermostatically controlled water bath engineered for reproducible temperature maintenance in life science, pharmaceutical, chemical, and materials research laboratories. Operating on the principle of convective heat transfer via a fully immersed, stainless-steel water reservoir and integrated circulation pump, the WNB29 ensures uniform thermal distribution across the entire bath volume (29 L). Its design adheres to core requirements of GLP-compliant environments—featuring traceable temperature control, redundant safety architecture, and documented calibration pathways. The unit supports applications ranging from enzyme incubation and sample equilibration to solvent evaporation, distillation support, and reaction temperature stabilization—where stability within ±0.1 °C and minimal spatial gradient (<0.2 °C at 37 °C) are critical.
Key Features
- Pt100-based temperature sensing: E-type models incorporate dual four-wire Pt100 sensors—one immersed in the bath medium, one monitoring heater block—enabling real-time differential compensation and eliminating lead-wire resistance error.
- PID-controlled thermal regulation with auto-tuning: Maintains setpoint accuracy of ±0.1 °C across the full operating range (10–95 °C), with optional boiling mode fixed at 100 °C (non-regulated, open-loop).
- Triple-layer overtemperature protection (E-type): Includes primary PID failure cutoff (+10 °C above setpoint), user-configurable electronic safety limit (TWW/TWB), and independent mechanical cutout (TB, activated at +30 °C above bath’s maximum rated temperature).
- Time-programmable operation: B-type supports up to 99 h 59 min with three phase modes (Start, Delay Start, Hold); E-type extends runtime to 999 hours with additional “Hold-by-Time” logic enabling dynamic temperature ramping profiles.
- Corrosion-resistant construction: 316L stainless steel inner tank and exterior housing; IP20-rated electrical enclosure; CE-marked per EN 61010-1:2019 and EN 61326-1:2013 for laboratory equipment safety and EMC compliance.
Sample Compatibility & Compliance
The WNB29 accommodates standard laboratory vessels—including Erlenmeyer flasks (100–500 mL), test tubes (14.5–32 mm OD), and custom jigs—via interchangeable stainless steel racks (N-series) and adjustable-height support frames (L5). Optional accessories include vibration-damped orbital shaker modules (L4), liquid-level controllers for unattended operation, and insulated flat or gabled lids (L0–L2) minimizing evaporation and thermal loss. All configurations maintain compatibility with ISO/IEC 17025 traceability frameworks when paired with external calibration probes. The system meets essential requirements for USP (Thermal Analysis Apparatus) and ASTM E2209 (Standard Practice for Calibration of Laboratory Baths), supporting audit-ready documentation under FDA 21 CFR Part 11 when used with validated software interfaces.
Software & Data Management
While the WNB29 operates as a standalone instrument with local LED interface, its E-type controller supports RS485 Modbus RTU communication for integration into centralized lab infrastructure. When connected to Memmert’s optional VISION software suite (or third-party SCADA platforms), users gain access to real-time temperature logging, event-triggered alarms (e.g., deviation >0.5 °C for >60 s), and electronic audit trails compliant with ALCOA+ principles. Data export is available in CSV and PDF formats, with timestamps traceable to NIST-traceable time sources. Firmware updates preserve configuration integrity and include cryptographic signature verification to satisfy GxP change-control protocols.
Applications
- Pharmaceutical QC: Dissolution media conditioning per USP , stability testing of biologics at 25 °C/60% RH reference points, and excipient solubility studies.
- Molecular biology: Restriction enzyme digestion incubation, DNA denaturation/annealing protocols, and agarose gel electrophoresis buffer pre-warming.
- Chemical synthesis: Controlled hydrolysis reactions, reflux support, and catalyst activation under inert atmosphere (with optional lid seals).
- Materials science: Polymer solution viscosity pre-equilibration prior to rheometry, nanoparticle dispersion stabilization, and thin-film substrate annealing.
- Medical device validation: Simulated body temperature (37 °C) exposure testing of implant coatings and sterilization process challenge devices.
FAQ
What is the difference between the B-type and E-type controllers?
The B-type offers basic PID control with dual overtemperature protection and timer functionality up to 99 h 59 min. The E-type adds dual Pt100 sensing, triple overtemperature safety, extended timing (up to 999 h), Modbus connectivity, and programmable hold-by-time logic.
Can the WNB29 be used for oil baths?
No—the WNB29 is specifically designed for aqueous media. For oil-based applications, Memmert’s OB29 oil bath series is recommended, featuring modified heating elements and thermal cutoff thresholds optimized for organic solvents.
Is calibration certificate included with purchase?
A factory-issued conformity declaration per EN 61010-1 is provided. A UKAS-accredited calibration certificate (including as-found/as-left data at three points: 25 °C, 37 °C, and 60 °C) is available as an optional add-on service.
How is temperature uniformity verified across the bath volume?
Memmert validates spatial uniformity during production using a 9-point probe array (per DIN 12879), reporting maximum deviation ≤0.2 °C at 37 °C and ≤0.3 °C at 60 °C—data documented in the unit-specific performance report shipped with each instrument.
