WIGGENS WOHS-200 Pro High-Speed High-Torque Overhead Stirrer

Overview

The WIGGENS WOHS-200 Pro High-Speed High-Torque Overhead Stirrer is an engineered solution for demanding mixing and dispersion tasks in research, quality control, and pilot-scale synthesis environments. Utilizing a brushless DC motor coupled with a precision planetary gear train, this overhead stirrer delivers consistent rotational torque across its dual-range speed profile (20–600 rpm and 601–6000 rpm), enabling reliable operation with both low-viscosity solvents and highly viscous polymer melts or suspensions up to 100,000 cP. Its core design principle centers on closed-loop speed regulation—real-time current feedback dynamically adjusts motor output to counteract load-induced deceleration, ensuring stable rotational velocity even under variable viscosity conditions. The device is purpose-built for integration into jacketed reactors, bioreactors, and fume hood–constrained setups where operator proximity must be minimized without compromising process fidelity.

Key Features

• Brushless DC motor architecture ensures zero carbon wear, extended service life (>20,000 hours MTBF), and silent, low-vibration operation—critical for sensitive analytical instrumentation nearby.
• Dual-speed range configuration provides high-torque capability (up to 339 N·cm in low-speed mode) and high-RPM agility (up to 6000 rpm), supporting diverse rheological regimes from Newtonian fluids to shear-thinning gels.
• TFT touchscreen interface with intuitive touch-and-rotate control enables rapid parameter entry, real-time monitoring of speed, torque trend (derived from motor current), and operational status (blue standby / green run / red alarm LEDs).
• Modular split-system design (WOHS-200 Pro F variant) separates the drive head from the controller unit via a 2 m shielded cable with aviation-grade quick-connect interfaces—enabling safe remote operation inside biosafety cabinets or chemical fume hoods.
• Self-locking, tool-free chuck accommodates stirring elements from 0.5 mm to 10 mm diameter; hollow shaft (10.2 mm ID) supports internal temperature probe insertion or coaxial dosing lines.
• Integrated thermal sensor (−10 to 350 °C, 0.1 °C resolution) allows concurrent monitoring of external vessel temperature when used with compatible jacketed reactors or heating mantles.

Sample Compatibility & Compliance

The WOHS-200 Pro handles aqueous and organic media, emulsions, slurries, and semi-solid matrices with viscosities up to 100,000 cP. Its torque delivery and thermal management support prolonged agitation of exothermic reactions and temperature-sensitive formulations. The system complies with IEC 61010-1:2010 for laboratory electrical equipment safety and meets EMC requirements per EN 61326-1. Its isolated power architecture—featuring physically separated AC/DC adapter and motor drive unit—reduces risk of electric shock during wet-condition operations. For regulated environments, audit trails (via optional USB logging or analog 0–10 V output) can be configured to align with FDA 21 CFR Part 11 data integrity expectations when paired with validated software.

Software & Data Management

While standalone operation requires no PC, the WOHS-200 Pro F variant includes a USB 2.0 digital interface and analog I/O (0–10 V input/output, 0–20 mA input, footswitch port) for programmable automation. Third-party SCADA or LabVIEW integration is supported via Modbus RTU over RS-485 (adapter required). Optional WIGGENS StirControl software enables scheduled ramp profiles, torque-limited start sequences, and time-stamped CSV export of speed/torque/temperature logs—facilitating reproducibility documentation per ISO/IEC 17025 clause 7.7. All firmware updates are delivered via encrypted USB stick to maintain system integrity in secure networks.

Applications

This stirrer serves critical functions across pharmaceutical API crystallization, cosmetic emulsion homogenization, polymer solution degassing, catalyst slurry suspension in fine chemical synthesis, and cell culture medium preparation. Its high-speed capability enables efficient dispersion of nanomaterials (e.g., graphene oxide, metal oxides) in solvent systems, while low-speed high-torque mode ensures uniform blending of hydrogels and thickened APIs without air entrapment. In QC labs, it supports standardized ASTM D1200 (Ford Cup) and ISO 2555 viscosity test protocols when paired with calibrated spindles and thermostatted baths.

FAQ

Can the WOHS-200 Pro be used with jacketed glass reactors?
Yes—its hollow shaft (10.2 mm ID) and optional reactor-mounting brackets allow direct coupling to standard 24/40 or 29/32 ground-glass joints. Thermal sensor input accepts Pt100 or thermocouple signals from reactor jackets.
Is torque measurement traceable to SI units?
Torque values are derived from calibrated motor current-to-torque transfer functions, verified against DIN 51399-1 reference standards during factory calibration. Certificate of Conformance includes uncertainty budget.
Does the device support continuous operation at maximum torque?
Rated continuous torque is 47 N·cm (low-speed range); peak torque (339 N·cm) is permissible for ≤5 min intervals with ≥10 min cooldown between cycles to prevent thermal derating.
How is compliance with GLP documentation requirements addressed?
The TFT display logs all parameter changes with timestamps. When connected via USB, full session metadata—including user ID, setpoints, deviations, and error codes—is exportable in machine-readable format for inclusion in electronic lab notebooks.
What maintenance is required beyond routine cleaning?
None—the brushless motor and sealed planetary gearbox require no lubrication or periodic servicing. Annual verification of speed accuracy and thermal sensor calibration is recommended for GxP environments.