WIGGENS WOHS-10 Pro Overhead Stirrer
| Brand | WIGGENS |
|---|---|
| Origin | Germany |
| Model | WOHS-10 Pro |
| Maximum Stirring Volume | 10 L (water) |
| Speed Range | 50–10,000 rpm |
| Speed Accuracy | ±3% (at n > 300 rpm) |
| Speed Resolution | ≥1 rpm |
| Torque Range | –10 to 350 N·cm |
| Viscosity Range | up to 10,000 mPa·s |
| Shaft Clamp Diameter | 0.5–10 mm |
| Hollow Shaft Inner Diameter | 10.2 mm |
| Temperature Measurement Range | –10 to 350 °C |
| Temperature Resolution | 1 °C |
| Timer Range | 00:00:01 to 99:59:59 |
| Display | TFT LCD |
| Motor Type | Brushless DC |
| Power Supply | 100–240 VAC, 50/60 Hz |
| Dimensions (W×D×H) | 65 × 175 × 215 mm |
| Weight | Not specified |
Overview
The WIGGENS WOHS-10 Pro Overhead Stirrer is an electronically controlled, high-performance laboratory stirring system engineered for precision mixing, homogenization, and dispersion tasks in demanding R&D, quality control, and production environments. Unlike magnetic stirrers, this overhead design employs a direct-drive brushless DC motor coupled to a vertically oriented drive shaft—enabling true Couette flow dynamics in viscous or heterogeneous media where magnetic coupling fails. Its modular architecture supports scalable agitation across volumes from 50 mL to 10 L (in aqueous systems), with torque delivery optimized for non-Newtonian fluids, suspensions, emulsions, and polymer solutions. The unit operates on universal AC input (100–240 VAC), making it suitable for global laboratory deployment without voltage conversion hardware.
Key Features
- Brushless DC motor ensures maintenance-free operation, extended service life, low electromagnetic interference, and consistent torque output across the full speed range (50–10,000 rpm).
- TFT LCD display provides real-time visualization of set and actual speed, elapsed time, temperature (when paired with optional PT100 probe), torque feedback, and operational status via color-coded LEDs (blue = standby, green = active, red = fault/alarm).
- Intuitive dual-input control interface combines tactile rotary encoder and capacitive touch keys—allowing precise parameter entry without slip or drift, even with gloved hands.
- Self-locking chuck enables tool-free installation and rapid exchange of impellers, anchors, or disperser discs; accommodates shaft diameters from 0.5 mm to 10 mm with a 10.2 mm hollow shaft for integrated temperature or pH probe routing.
- Programmable timer supports durations from 1 second to 99 hours, 59 minutes, 59 seconds—essential for unattended long-term reactions, aging studies, or dissolution testing under GLP-compliant workflows.
- Integrated temperature monitoring (–10 to 350 °C, ±1 °C resolution) supports exothermic reaction control and thermal stability verification when used with certified Class A PT100 sensors (not included).
Sample Compatibility & Compliance
The WOHS-10 Pro accommodates a broad spectrum of sample types—including low-viscosity solvents, high-shear polymer melts, abrasive slurries, and shear-thinning biopolymer gels—without compromising reproducibility. Its mechanical design conforms to IEC 61010-1:2010 safety standards for laboratory electrical equipment. While not intrinsically rated for hazardous area use, its robust enclosure (IP20 rating) and galvanically isolated motor controller meet general-purpose lab environmental requirements. When operated with validated accessories and documented SOPs, the system supports compliance with ISO/IEC 17025, USP , and FDA 21 CFR Part 11 data integrity principles—particularly when paired with WIGGENS’ optional PC software for audit-trail-enabled method storage and result export.
Software & Data Management
The WOHS-10 Pro supports optional USB-connected PC software for remote configuration, method archiving, and time-stamped data logging (speed, torque, temperature, timer). All parameter changes are timestamped and user-identifiable, enabling full traceability required under GMP/GLP frameworks. Export formats include CSV and PDF reports compatible with LIMS integration. Firmware updates are delivered via signed binary packages to ensure device authenticity and cryptographic integrity—minimizing risk of unauthorized modification during regulatory audits.
Applications
- Chemical synthesis: Controlled addition and mixing in Grignard, Friedel-Crafts, and catalytic hydrogenation reactions.
- Pharmaceutical development: Dissolution testing per USP Apparatus II, suspension formulation, and granulation endpoint detection.
- Materials science: Dispersion of nanomaterials (e.g., graphene oxide, TiO₂ nanoparticles) in polymer matrices.
- Food & beverage QA: Homogenization of viscosity-standardized sauces, dressings, and dairy emulsions for rheological consistency checks.
- Environmental analysis: Preparation of standardized sediment slurry samples for heavy metal leaching tests (e.g., EPA Method 1311).
FAQ
Does the WOHS-10 Pro support bidirectional rotation?
Yes—it offers programmable clockwise and counterclockwise rotation modes, critical for de-agglomeration of settled particles and preventing vortex formation in low-density suspensions.
Can the unit be integrated into automated reactor systems?
Yes—via RS232 or optional analog 0–10 V / 4–20 mA interfaces for external PLC or DCS synchronization, including start/stop, speed ramping, and torque limit signaling.
Is calibration documentation provided with the instrument?
Factory calibration certificates (traceable to national standards) are available upon request; users may perform in-house speed and torque verification using NIST-traceable tachometers and calibrated load cells.
What impeller types are recommended for high-viscosity applications?
Anchor, helical ribbon, and double-helix impellers—mounted on stainless steel or PTFE-coated shafts—are validated for viscosities up to 10,000 mPa·s at reduced speeds (≤500 rpm) to maintain mechanical stability and heat dissipation.
How is thermal protection implemented?
The motor incorporates embedded thermistors that trigger automatic shutdown if internal winding temperature exceeds 110 °C; cooling is passive via aluminum housing convection—no fans required.
