WIGGENS WOHS-15 Pro Overhead Stirrer

Overview

The WIGGENS WOHS-15 Pro Overhead Stirrer is an industrial-grade, brushless DC motor-driven laboratory stirrer engineered for high-torque, long-duration mixing and dispersion tasks in demanding R&D, quality control, and pilot-scale synthesis environments. Unlike magnetic stirrers constrained by heat and viscosity limits, the WOHS-15 Pro employs a robust overhead architecture with direct mechanical coupling—enabling precise control over highly viscous, heterogeneous, or temperature-sensitive media across volumes up to 50 L of water-equivalent fluid. Its core operational principle relies on regulated torque delivery via closed-loop speed feedback, ensuring stable rotational output even under variable load conditions typical in polymer solutions, suspensions, emulsions, and reactive batch systems. Designed and manufactured to German engineering standards, the unit integrates real-time temperature monitoring via integrated Pt100-compatible probe inputs (not included), supporting process-critical applications where thermal stability directly impacts reaction kinetics or product consistency.

Key Features

• Brushless DC motor architecture: Delivers high starting torque (≤29 N·cm), low thermal drift, and extended service life—ideal for continuous operation under variable load profiles.
• Wide dynamic speed range: Adjustable from 40 to 2000 rpm in 1-rpm increments, with ≤±3% accuracy above 300 rpm—ensuring reproducibility for both gentle homogenization and high-shear dispersion.
• Intelligent torque sensing: Converts motor current draw into real-time torque trend visualization, enabling users to detect agitator stall, viscosity shifts, or impeller fouling without external instrumentation.
• Tool-free self-locking chuck system: Accepts stirring shafts from 0.5 to 10 mm diameter; hollow 10.2 mm internal bore accommodates temperature probes or auxiliary sensors during operation.
• High-resolution TFT display & dual-input interface: Combines tactile rotary encoder and capacitive touch keys for intuitive parameter entry, including programmable timer (0–99 h 59 min 59 sec) and bidirectional rotation selection.
• Thermal monitoring integration: Supports external PT100-class temperature probes (IEC 60751 compliant) with 0.1 °C resolution and full-range capability from −10 °C to +350 °C—critical for exothermic reactions or high-temperature solvent-based formulations.
• IP42-rated enclosure & universal power supply: Ensures safe operation in non-condensing lab environments; accepts 100–240 VAC, 50/60 Hz input with efficient 100 W input / 60 W mechanical output conversion.

Sample Compatibility & Compliance

The WOHS-15 Pro is validated for use with Newtonian and non-Newtonian fluids up to 20,000 mPa·s, including aqueous polymer solutions, ceramic slurries, pharmaceutical suspensions, and organic-phase reaction mixtures. Its mechanical design conforms to IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emissions) standards. While not intrinsically rated for hazardous area use, the unit meets general-purpose electrical safety requirements per IEC 61010-1:2010 (Edition 3.1) for laboratory equipment. When paired with GLP-compliant data loggers and validated temperature probes, it supports audit-ready workflows aligned with FDA 21 CFR Part 11 and ISO/IEC 17025 documentation expectations.

Software & Data Management

The WOHS-15 Pro operates as a standalone instrument with no proprietary software dependency. All operational parameters—including speed setpoint, direction, timer status, torque trend, and real-time temperature—are displayed locally on the high-contrast TFT screen with color-coded LED status indicators (blue = standby, green = active, red = fault). For traceable data capture, users may integrate third-party RS232/USB-to-serial adapters (optional) to log timestamped speed, torque, and temperature values into CSV-compatible platforms such as LabVIEW, MATLAB, or custom Python scripts. The device does not feature built-in memory or cloud connectivity; this architecture prioritizes deterministic response time and eliminates firmware-related validation overhead in regulated QC labs.

Applications

• Synthesis of polymeric materials requiring controlled shear history and thermal profiling
• Preparation of uniform suspensions for catalyst testing or battery electrode slurries
• Emulsion stabilization studies under defined shear and temperature gradients
• Long-duration dissolution testing per USP and protocols
• Batch-wise formulation of cosmetics, paints, and adhesives with rheological sensitivity
• Exothermic reaction monitoring in jacketed reactors with simultaneous cooling/heating control

FAQ

Does the WOHS-15 Pro include a temperature probe?
No—the unit provides a calibrated Pt100-compatible input port and signal conditioning but does not ship with a probe. Users must select a compatible Class A or B Pt100 sensor meeting IEC 60751 specifications.
Can the stirrer operate continuously for 24 hours?
Yes—its brushless DC motor, thermal management design, and IP42-rated housing support unattended operation within ambient temperatures of 5–40 °C and relative humidity ≤80% non-condensing.
Is reverse rotation programmable for specific mixing protocols?
Yes—bidirectional operation is selectable via front-panel controls and retains direction setting across power cycles.
What is the maximum recommended viscosity for reliable torque delivery?
The system maintains stable speed regulation up to 20,000 mPa·s using standard anchor or helical impellers; optimal performance requires proper impeller geometry and vessel aspect ratio per ANSI/AIHA Z9.1 guidelines.
Does the unit comply with GLP or GMP documentation requirements?
As a stand-alone hardware device, it supports GLP/GMP workflows when used with validated accessories, documented SOPs, and external electronic records systems—but contains no audit trail, user authentication, or electronic signature functionality per 21 CFR Part 11.