MEMMERT WNB7 Water Bath

Overview

The MEMMERT WNB7 Water Bath is a precision-engineered laboratory thermal management system designed for stable, uniform, and traceable temperature control in aqueous environments. Operating on the principle of convective heat transfer via thermostatically regulated water circulation, the WNB7 maintains setpoint accuracy within ±0.1 °C across its full operating range (10 °C to 95 °C), with an additional dedicated boiling mode at 100 °C. Engineered for compliance-critical workflows in pharmaceutical development, clinical diagnostics, biotechnology R&D, and analytical chemistry laboratories, the unit integrates dual- or triple-redundant overtemperature protection, high-stability Pt100 sensing architecture, and CE-marked electrical safety per IEC 61010-1. Its stainless-steel bath chamber (AISI 304) and housing ensure long-term corrosion resistance, mechanical integrity, and compatibility with routine cleaning agents used under GLP/GMP conditions.

Key Features

• Precision PID temperature control with 0.1 °C resolution and repeatability ≤ ±0.2 °C under steady-state conditions
• Dual four-wire Pt100 sensors (E-type only): one for primary control, one for independent monitoring and redundancy verification
• Configurable timer functionality: B-type supports 1 min–99 h 59 min with Start / Delay Start / Hold modes; E-type extends to 999 h with programmable Hold or Time-Dependent Temperature Ramp profiles
• Triple-level overtemperature protection (E-type): electronic fault shutdown (> +10 °C above setpoint), user-configurable electronic limit (TWW/TWB), and fail-safe mechanical cutoff (TB, triggered > +30 °C above bath’s maximum rated temperature)
• LED display with alarm indication for sensor failure, heater fault, low liquid level (optional), and overtemperature events
• Integrated recirculation pump (standard on WB7 configuration) ensures homogeneous temperature distribution and minimizes vertical thermal gradients (< 0.2 °C deviation at 37 °C, measured per DIN 12879)
• Stainless-steel construction (bath interior and outer casing) compliant with ISO 15190:2020 for laboratory safety infrastructure

Sample Compatibility & Compliance

The WNB7 accommodates standard laboratory glassware including Erlenmeyer flasks (100–500 mL), test tubes (14.5–32 mm OD), and reaction vessels up to 240 × 210 × 140 mm (internal dimensions). Optional accessories—such as conical flask holders, adjustable-height racks, orbital shaker modules (for WB-series only), and liquid-level controllers—enable adaptation to diverse experimental protocols. The system meets essential regulatory requirements for use in quality-controlled environments: CE marking per Directive 2014/30/EU (EMC) and 2014/35/EU (LVD); conformity with EN 61010-1:2010 for laboratory equipment safety; and design alignment with FDA 21 CFR Part 11 expectations for audit-trail-capable instrumentation when paired with MEMMERT’s optional data logging software.

Software & Data Management

While the WNB7 operates as a standalone instrument with local control, it supports external data acquisition via analog output (0–10 V) for temperature signal transmission and digital interface options (RS232 or optional USB-to-RS232 adapter). When integrated with MEMMERT’s optional LabSoft software suite, users gain access to real-time graphing, event-triggered logging, exportable CSV reports, and electronic signature-enabled protocol archiving—facilitating adherence to ALCOA+ data integrity principles. All temperature and time parameters are stored internally with timestamping, and firmware updates preserve calibration history and operational logs without data loss.

Applications

• Enzyme kinetics assays requiring precise incubation at 37 °C or 60 °C
• Sample preheating prior to HPLC injection or GC analysis
• Controlled evaporation and solvent concentration under gentle thermal conditions
• Cell culture media warming and reagent equilibration in sterile workflows
• Calibration of temperature-sensitive probes and reference standards (traceable to NIST-certified references)
• Accelerated stability testing per ICH Q1A(R3) guidelines using time-temperature hold profiles
• Distillation support and reflux condensation setups in synthetic organic chemistry

FAQ

What is the minimum ambient temperature required for stable operation at 10 °C?
The WNB7 requires ambient conditions ≥ 5 °C below the target setpoint; therefore, sustained 10 °C operation necessitates an ambient temperature ≤ 5 °C.
Can the WNB7 be used with non-aqueous fluids such as silicone oil or glycerol?
No—the WNB7 is specifically engineered for water-based operation. For oil-based applications, MEMMERT’s OB7 oil bath series is recommended.
Is the recirculation pump included as standard on all WNB7 units?
Yes—the WB7 variant (water bath with pump) includes an integrated circulation pump; this is not available on non-recirculating configurations.
Does the WNB7 support remote monitoring via Ethernet or Wi-Fi?
Not natively. Remote connectivity requires third-party PLC integration or MEMMERT’s optional RS232/USB interface paired with LabSoft software on a host PC.
How often does the Pt100 sensor require recalibration?
MEMMERT recommends annual verification against a certified reference thermometer (e.g., Fluke 1523/1524) in accordance with ISO/IEC 17025-accredited laboratory practice.