WIGGENS WB2000-M Digital Overhead Stirrer

Overview

The WIGGENS WB2000-M Digital Overhead Stirrer is an engineered solution for precise, reproducible mixing in research, quality control, and production laboratories. Designed around a brushless DC motor architecture, it eliminates carbon brush wear—ensuring consistent torque delivery and extended operational life under continuous high-load conditions. Its core principle relies on direct-drive mechanical coupling between motor and stir shaft, enabling stable rotational motion across the full speed range (40–2000 rpm) with minimal thermal drift or speed fluctuation. Unlike gear-driven or belt-coupled systems, this direct-drive configuration minimizes mechanical backlash and inertia-related overshoot, making it especially suitable for applications requiring accurate shear rate control—such as polymer solution homogenization, suspension stabilization, and emulsion preparation. The unit operates at ambient temperature and is not equipped with integrated heating or cooling; however, its robust thermal management allows uninterrupted operation during multi-hour protocols without performance degradation.

Key Features

• Brushless DC motor delivering constant torque up to 70 N·cm—optimized for viscous media handling up to 20,000 cP
• Digital speed display with ±1 rpm accuracy and large ergonomic rotary knob—designed for glove-compatible operation and tactile feedback
• Microprocessor-based closed-loop speed regulation ensures real-time correction against load-induced deceleration
• Sealed motor housing with corrosion-resistant surface finish—rated for long-term use in standard laboratory environments including mild chemical exposure zones
• Integrated electronic overload protection with automatic shutdown and audible alert upon torque limit exceedance
• Soft-start functionality at low speeds (<100 rpm) to prevent splashing and improve operator safety during vessel loading
• Reversible rotation mode supports bidirectional mixing protocols—critical for deagglomeration and particle dispersion studies
• Standard accessories include stainless-steel four-blade impeller, universal clamp, and rigid iron stand—fully compatible with ISO-standard lab frame systems

Sample Compatibility & Compliance

The WB2000-M accommodates a wide range of sample containers—from 50 mL centrifuge tubes to 20 L jacketed reactors—via adjustable shaft clamping (max. 10 mm diameter). It supports common impeller types including paddle, propeller, anchor, and turbine configurations (sold separately), enabling optimization for Newtonian and non-Newtonian fluid behavior. All electrical components comply with UL 61010-1 and IEC 61010-1 safety standards for laboratory equipment. While the unit itself does not carry CE marking for EU market placement, its design conforms to essential requirements outlined in Annex I of the Low Voltage Directive (2014/35/EU) and Electromagnetic Compatibility Directive (2014/30/EU) when used with certified power supplies. No built-in temperature control means it is not intended for applications requiring thermal regulation per ASTM E2913 or ISO 17025 clause 5.4.2.

Software & Data Management

The WB2000-M operates as a standalone instrument without proprietary software or PC connectivity. Speed setpoints and real-time rpm values are displayed locally via LED interface only; no data logging, remote control, or audit trail functionality is included. As such, it meets basic GLP documentation needs through manual entry into lab notebooks or LIMS-integrated workflows. For users requiring electronic records compliant with FDA 21 CFR Part 11, external USB-based data loggers or third-party DAQ systems may be interfaced via analog tachometer output (available upon request from WIGGENS technical support). Firmware updates are not supported—the device features fixed-function microcontroller logic optimized for reliability over programmability.

Applications

• Homogenization of polymer melts and concentrated colloidal suspensions in material science labs
• Preparation of uniform aqueous and organic-phase reaction mixtures in synthetic chemistry workflows
• Dispersion of nanomaterials (e.g., graphene oxide, TiO₂ nanoparticles) in solvent-based matrices
• Cell culture media conditioning and buffer equilibration in bioprocessing R&D settings
• Quality assurance testing of viscosity-sensitive formulations—including paints, adhesives, and pharmaceutical gels
• Stirred-tank reactor (STR) simulation in pilot-scale process development studies

FAQ

Does the WB2000-M support external speed control via analog signal input?

No—it is a manually operated unit with no analog or digital communication ports.
Can the unit be mounted on custom reactor vessels with non-standard flange interfaces?

Yes, provided mechanical stability and shaft alignment are maintained using third-party mounting adapters rated for ≤70 N·cm torque.
Is the stainless-steel impeller autoclavable?

Yes—the included four-blade impeller is made from AISI 316 stainless steel and withstands standard autoclave cycles (121°C, 2 bar, 20 min).
What maintenance is required for long-term operation?

None beyond periodic visual inspection of shaft coupling integrity and cleaning of external surfaces with isopropyl alcohol.
How does the WB2000-M compare to the WB2000-D model?

The WB2000-D adds LED digital control with keypad input and higher-resolution speed setting; the WB2000-M prioritizes tactile simplicity and glove-friendly operation over granular parameter programming.