WIGGENS WB2000-U Overhead Stirrer

Overview

The WIGGENS WB2000-U Overhead Stirrer is an engineered solution for precision-controlled mechanical mixing in research, quality control, and production laboratories. Designed according to DIN EN 61000-6-2/6-4 electromagnetic compatibility standards and built for long-term reliability under continuous operation, this overhead stirrer employs a closed-loop brushless DC motor architecture—eliminating carbon brush wear, arcing, and associated maintenance downtime. Its core operational principle relies on microprocessor-based speed feedback control, ensuring stable rotational output across the full 40–2000 rpm range—even under variable load conditions such as increasing viscosity or changing impeller geometry. The unit’s hollow-shaft design (10.2 mm internal diameter) enables unobstructed passage of temperature probes, pH electrodes, or dosing lines directly through the drive shaft, supporting integrated process monitoring without repositioning the stirrer head. This configuration is particularly advantageous in GLP-compliant reaction monitoring, polymerization studies, and multi-parameter bioreactor simulations.

Key Features

• Brushless DC motor with thermal and current-limiting protection—rated for continuous duty at maximum torque (≤70 N·cm) and viscosity loads up to 50,000 mPa·s
• Hollow-shaft drive mechanism allowing concurrent insertion of sensors or feed lines without height adjustment
• High-visibility LED display with 1-rpm resolution and intuitive rotary encoder control—optimized for gloved operation in containment environments
• Self-locking, tool-free chuck system with ±0.05 mm concentricity tolerance and 0.5–10 mm clamping range
• RS485 serial interface compliant with Modbus RTU protocol for integration into SCADA systems, LIMS, or custom LabVIEW/Python automation frameworks
• IP42-rated enclosure with corrosion-resistant surface finish suitable for routine exposure to aqueous, mildly acidic, or organic solvent vapors
• Three-color status LED (blue/standby, green/running, red/fault) providing immediate visual diagnostics
• Soft-start ramp function minimizing mechanical shock during initiation—critical for shear-sensitive suspensions and emulsions

Sample Compatibility & Compliance

The WB2000-U supports universal compatibility with standard laboratory impellers—including paddle, propeller, anchor, and helical types—via its ISO 8573-1-compliant chuck interface. It accommodates vessels from 50 mL beakers to 50 L jacketed reactors, maintaining consistent shear profiles across scale-up studies. The unit meets IEC 61010-1 safety requirements for laboratory electrical equipment and conforms to EU RoHS Directive 2011/65/EU. Its RS485 communication channel supports audit-trail-capable data logging when paired with validated third-party software, fulfilling basic FDA 21 CFR Part 11 data integrity prerequisites for non-GMP environments. While not certified for hazardous area use (ATEX/IECEx), its IP42 rating ensures reliable operation in general-purpose chemical and pharmaceutical labs adhering to ISO 14644-1 Class 8 cleanroom ambient conditions.

Software & Data Management

Data acquisition and remote operation are enabled via the RS485 port using ASCII-based command protocols documented in the WIGGENS Communication Protocol Manual (Rev. 3.2). Users may interface the device with industry-standard platforms including MATLAB Instrument Control Toolbox, Python’s pySerial library, or commercial SCADA packages (e.g., Ignition, WinCC) for real-time speed logging, alarm triggering, and batch record generation. Optional WIGGENS IoT Gateway modules provide TLS-secured MQTT telemetry transmission to cloud dashboards, supporting time-stamped event logging (start/stop/pause/fault), RPM history export (CSV), and configurable threshold alerts. All local display parameters—including setpoint, actual speed, operating time, and fault codes—are retained in non-volatile memory during power interruption.

Applications

• Kinetic studies requiring constant-shear mixing of catalyst slurries or nanoparticle dispersions
• Preparation of high-viscosity polymer solutions (e.g., PVP, CMC, xanthan gum) where torque stability is critical
• Controlled crystallization experiments with simultaneous temperature and pH probe integration
• QC testing of topical formulations (creams, ointments) per USP viscosity standards
• Biological buffer equilibration and cell culture media preparation under aseptic hood conditions
• Educational demonstrations of Reynolds number effects and laminar-to-turbulent transition thresholds

FAQ

Is the WB2000-U compatible with third-party impellers?
Yes—the self-locking chuck accepts any standard cylindrical shaft with diameters between 0.5 mm and 10 mm, including ASTM E2913-compliant geometries.
Does the unit support speed calibration traceable to national standards?
While the WB2000-U does not include onboard calibration firmware, its optical encoder output allows external verification using NIST-traceable tachometers; calibration certificates can be issued by WIGGENS-authorized service centers.
Can the RS485 interface be used for closed-loop PID control with external sensors?
The RS485 port supports only master-slave command-response mode; it does not accept analog feedback signals. For true PID integration, an external controller (e.g., PLC or Arduino with PID library) must manage setpoint modulation.
What is the expected service life of the brushless motor under continuous 24/7 operation?
Rated for ≥20,000 hours MTBF at 70% nominal torque load, assuming ambient temperatures ≤35 °C and adequate ventilation.
Is the hollow shaft sealed against liquid ingress?
No—the hollow shaft is mechanically open; users must implement separate sealing solutions (e.g., rotary feedthroughs or O-ring bushings) when passing probes through aggressive solvents or pressurized systems.