WIGGENS WOHS-40 Pro Overhead Stirrer
| Brand | WIGGENS |
|---|---|
| Origin | Germany |
| Model | WOHS-40 Pro |
| Stirrer Type | Overhead Stirrer |
| Max. Mixing Volume | ≤100 L (H₂O) |
| Speed Range | 30–2000 rpm |
| Speed Resolution | ≥1 rpm |
| Speed Accuracy (n > 300 rpm) | ≤±3% |
| Torque Limit | ≤110 N·cm |
| Viscosity Range | ≤70,000 mPa·s |
| Temperature Measurement Range | −10 to 350 °C |
| Temp. Resolution | 0.1 °C |
| Motor Type | Brushless DC |
| Input Power | 200 W |
| Output Power | 130 W |
| Chuck Type | Self-locking, tool-free |
| Shaft Clamp Diameter | 0.5–10 mm |
| Hollow Shaft ID | 10.2 mm |
| Dimensions (W×D×H, w/o support rod) | 100 × 241 × 295 mm |
| Support Rod | 16 × 220 mm |
| IP Rating | IP42 |
| Supply Voltage | 100–240 VAC, 50/60 Hz |
| Display | High-brightness TFT LCD |
| Direction Control | Clockwise & Counterclockwise |
| Timer Range | 0–99 h 59 min 59 sec |
| Status Indicators | Standby (blue), Running (green), Alarm (red) |
Overview
The WIGGENS WOHS-40 Pro Overhead Stirrer is an industrial-grade laboratory stirring system engineered for precision, repeatability, and long-term operational stability in demanding mixing, dispersion, and homogenization applications. Designed and assembled in Germany under stringent quality control protocols, this overhead stirrer employs a brushless DC motor architecture—eliminating carbon brush wear, reducing electromagnetic interference, and ensuring consistent torque delivery across the full speed range. Its core operating principle relies on direct mechanical coupling between the motor output shaft and the stirring element via a self-locking, tool-free chuck, enabling rapid setup and secure retention of impellers—even under high-viscosity or high-torque conditions. Unlike magnetic stirrers limited by heat transfer and vessel geometry constraints, the WOHS-40 Pro delivers true top-driven agitation with full control over rotational direction (CW/CCW), real-time torque monitoring (via current-to-torque conversion), and integrated temperature sensing—making it suitable for exothermic reactions, polymer synthesis, suspension preparation, and solvent-based formulations where thermal management and shear control are critical.
Key Features
- Brushless DC motor with 130 W continuous output power and peak torque up to 110 N·cm—optimized for sustained operation at elevated viscosities (≤70,000 mPa·s) and volumes up to 100 L (water-equivalent)
- High-resolution TFT LCD display with intuitive touch-key + rotary encoder interface for simultaneous parameter entry, directional selection, and timer configuration (0–99 h 59 min 59 sec)
- Self-locking chuck system accommodating stirring rods from 0.5 to 10 mm diameter; hollow shaft design (ID: 10.2 mm) enables integration with temperature probes, pH electrodes, or reflux condensers
- Integrated Pt100-compatible temperature sensor input supporting measurement from −10 °C to +350 °C with 0.1 °C resolution—ideal for jacketed reactors and heated/cryogenic vessels
- Three-color LED status indicators (blue = standby, green = active, red = fault/alarm) and audible alert for overload, overspeed, or thermal cutoff events
- IP42-rated enclosure providing protection against solid objects >1 mm and vertically falling water droplets—suitable for general lab environments including fume hoods and controlled humidity areas
- Universal AC input (100–240 VAC, 50/60 Hz) with internal switching power supply ensures stable performance across global electrical infrastructures
Sample Compatibility & Compliance
The WOHS-40 Pro supports a broad spectrum of sample types—including aqueous and organic solutions, suspensions, emulsions, pastes, and thermosetting resins—across glass, stainless steel, and Hastelloy reaction vessels. Its mechanical design accommodates standard laboratory glassware (e.g., round-bottom flasks, jacketed reactors, and custom bioreactor vessels) with compatible clamping fixtures. From a regulatory standpoint, the device complies with IEC 61010-1:2010 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use) and meets EMC requirements per EN 61326-1:2013. While not inherently 21 CFR Part 11 compliant as a standalone unit, its digital interface and audit-ready parameter logging (when paired with WIGGENS’ optional PC software) support GLP/GMP-aligned workflows when implemented within validated instrument qualification frameworks.
Software & Data Management
The WOHS-40 Pro operates autonomously but integrates seamlessly with WIGGENS’ optional LabControl Suite (v3.2+), a Windows-based application enabling remote parameter setting, real-time torque and temperature trending, event-triggered data capture, and CSV export for traceability. All user-modifiable settings—including speed setpoint, direction, timer duration, and temperature alarm thresholds—are stored in non-volatile memory with timestamped change logs. The system supports password-protected access levels (Operator / Supervisor), and firmware updates are performed via USB connection using digitally signed binaries to ensure integrity. For laboratories requiring electronic records compliance, the software optionally generates PDF reports containing metadata (user ID, timestamp, instrument serial number), raw time-series data, and pass/fail flags against predefined SOP limits.
Applications
- Chemical synthesis: Controlled addition of reagents during multi-step reactions under inert atmosphere or reflux conditions
- Pharmaceutical formulation: Preparation of suspensions, ointments, and granulation binders requiring reproducible shear history
- Materials science: Dispersion of nanoparticles in polymer matrices, graphite intercalation, and battery slurry homogenization
- Food & beverage R&D: Emulsion stabilization trials, viscosity profiling of dairy analogs, and enzymatic hydrolysis kinetics studies
- Environmental testing: Digestion of solid waste samples in acid media under elevated temperature and agitation
- Quality control labs: Routine verification of batch-to-batch consistency in viscous products such as adhesives, sealants, and coatings
FAQ
What is the maximum recommended viscosity for continuous operation?
The WOHS-40 Pro is rated for continuous duty up to 70,000 mPa·s at speeds ≥300 rpm. Operation above this limit may trigger thermal protection or reduce service life of the motor windings.
Can the stirrer be used with corrosive solvents like concentrated HNO₃ or HF?
The housing and chuck assembly are constructed from chemically resistant PBT+GF and stainless steel (AISI 304). However, direct exposure to HF or hot fuming nitric acid requires additional protective shielding and is not covered under warranty.
Is external temperature feedback required to maintain setpoint accuracy?
No—the built-in Pt100 input provides direct vessel temperature monitoring, but closed-loop temperature control requires integration with an external heating/cooling circulator via analog or digital I/O (available as optional module).
Does the device support RS-232 or Ethernet communication?
Standard configuration includes USB 2.0 only. RS-485 Modbus RTU and Ethernet (TCP/IP) interfaces are available upon request as factory-installed options.
How often should the chuck mechanism be serviced?
Under normal use, the self-locking chuck requires no scheduled maintenance. Visual inspection every 6 months is recommended to verify absence of particulate buildup or deformation of the collet jaws.
