Memmert WPE Series Pump-Circulated Water Bath

Overview

The Memmert WPE Series Pump-Circulated Water Bath is a precision-engineered thermal stability platform designed for laboratories requiring uniform, reproducible temperature control in aqueous environments. Unlike natural convection baths, the WPE integrates a built-in circulation pump that actively homogenizes bath fluid—ensuring temperature deviations of ≤ ±0.1°C across the entire working volume. This forced circulation architecture eliminates thermal stratification and significantly improves heat transfer efficiency to immersed samples, making it ideal for applications demanding high spatial and temporal temperature fidelity, such as enzyme kinetics, cell culture incubation, dissolution testing (USP ), and calibration of temperature-sensitive sensors. The system operates within a controlled range of 10°C to 95°C (with minimum setpoint constrained to ambient temperature +15°C), plus a dedicated boiling mode at 100°C. Its robust stainless steel (AISI 304) construction, CE-marked safety compliance, and adherence to IEC 61010-1 for laboratory equipment underscore its suitability for regulated environments including ISO/IEC 17025-accredited labs and GxP workflows.

Key Features

• Forced-circulation design with integrated pump ensures superior thermal uniformity (≤ ±0.1°C) and rapid equilibration times
• E-type controller with dual 4-wire Pt100 sensors—one immersed in the bath medium, one mounted in the heating block—for independent verification and drift compensation
• PID temperature regulation with adaptive tuning and real-time self-diagnostic monitoring; LED display with alarm indicators for fault conditions (e.g., sensor failure, overtemperature)
• Triple-stage overtemperature protection: (1) primary electronic cut-off at +10°C above setpoint, (2) user-adjustable secondary electronic limit (TWW/TWB), and (3) fail-safe mechanical thermostat (TB) activated at +30°C above maximum rated bath temperature
• Programmable timing functions—including immediate start, delayed start, hold, and time-dependent temperature ramping—support unattended operation up to 999 hours
• Modular chassis accommodates six standard bath volumes (7, 10, 14, 22, 29, and 45 L), each engineered for structural rigidity and thermal inertia optimization
• Full stainless steel wetted parts (bath tank, ports, lid interfaces) ensure corrosion resistance, cleanability, and compatibility with cleaning agents used in cGMP facilities

Sample Compatibility & Compliance

The WPE bath accommodates diverse sample formats via an extensive catalog of validated accessories: flat or conical stainless steel lids (with configurable aperture arrays), shaker modules (for orbital agitation at 30–300 rpm), multi-tier tube racks (for diameters from 10 mm to 32 mm), conical flask holders (100–500 mL), and immersion baskets with perforated stainless steel bases. Optional water level controllers (L3) and semiconductor cooling units (CDP115, enabling operation down to 10°C) extend operational flexibility. All configurations maintain full traceability under GLP and GMP frameworks. The device meets electromagnetic compatibility (EMC) standards EN 61000-6-3 and EN 61000-6-4, and its electrical safety conforms to EN 61010-1. When paired with Memmert’s validated software suite (e.g., memmert connect), the WPE supports 21 CFR Part 11-compliant electronic records, including user authentication, audit trails, and electronic signatures.

Software & Data Management

While the WPE operates autonomously via its front-panel interface, integration with Memmert’s memmert connect software enables remote monitoring, parameter logging, and export of timestamped temperature/time profiles in CSV or PDF format. The software supports configuration locking, user role-based access control (administrator/operator), and automated report generation aligned with ISO 17025 clause 7.8.2 requirements for result reporting. Calibration data—including factory-issued certificates (Z4 series, traceable to DKD/DAkkS standards at 37°C)—can be digitally attached to instrument records. All firmware updates are digitally signed and delivered through secure channels, ensuring integrity and version control in audited environments.

Applications

The WPE serves critical roles across pharmaceutical QC (e.g., disintegration testing per USP , viscosity assessment of liquid formulations), clinical microbiology (blood culture warming, reagent pre-incubation), materials science (polymer solubility studies, gelation point determination), and academic research (protein denaturation assays, DNA hybridization protocols). Its stable thermal field and low drift (<0.05°C/h) make it suitable for long-duration experiments requiring minimal operator intervention. The pump-circulated architecture also mitigates evaporation-induced concentration gradients during extended runs—a key advantage over static bath systems.

FAQ

What is the difference between the WPE and WNE models?

The WPE features a built-in circulation pump for active fluid mixing, delivering superior temperature homogeneity and faster response times; the WNE relies on natural convection and is intended for less demanding applications where uniformity tolerances are relaxed.

Can the WPE be used with oil media?

No—the WPE is specifically engineered for aqueous use. For temperatures exceeding 95°C, Memmert recommends the ONE series oil bath, which is rated up to 200°C and includes enhanced thermal insulation and oil-specific safety logic.

Is the WPE compliant with FDA 21 CFR Part 11?

The hardware itself is Part 11–capable when operated with validated software (memmert connect v3.2+), configured with audit trail logging enabled, and deployed under documented SOPs covering user access, electronic signature implementation, and backup/recovery procedures.

How often does the WPE require recalibration?

Annual calibration is recommended per ISO/IEC 17025 and internal quality policies; however, routine performance verification using traceable reference thermometers (e.g., Fluke 1523/1524) should be performed before each critical assay batch.

Are replacement parts and service support available globally?

Yes—Memmert maintains authorized service centers in over 60 countries, and all consumables (sensors, lids, gaskets) carry standardized part numbers (e.g., L0, L1, Z4) with guaranteed 10-year spare parts availability from date of product discontinuation.