WIGGENS WOHS-60 Pro Overhead Stirrer

Overview

The WIGGENS WOHS-60 Pro Overhead Stirrer is an engineered solution for high-demand mixing, homogenization, and dispersion tasks in research laboratories, pilot-scale synthesis, and quality control environments. Designed around a brushless DC motor architecture, it delivers stable torque output across its full speed range (30–2000 rpm), enabling consistent shear application during viscous or non-Newtonian fluid processing. Unlike magnetic stirrers limited by heat transfer and vessel geometry, the overhead configuration supports direct mechanical coupling to impellers—ensuring precise rotational control regardless of vessel size, shape, or thermal conditions. Its integrated temperature sensing system (−10 to 350 °C, 0.1 °C resolution) allows real-time monitoring of process thermal dynamics when used with compatible temperature probes—critical for exothermic reactions, polymerization, or solvent evaporation workflows. The device complies with IEC 61000-6-3 (EMC emissions) and IEC 61000-6-2 (immunity), and its IP42-rated enclosure provides protection against splashing water and solid ingress during routine benchtop operation.

Key Features

• Brushless DC motor with closed-loop speed regulation ensures high reproducibility and extended service life under continuous load
• TFT high-contrast display with intuitive touch keys and rotary encoder for dual-mode parameter input (speed, time, direction)
• Bi-directional rotation capability (clockwise/counterclockwise) supports specialized mixing protocols including vortex suppression and layered suspension
• Real-time torque estimation via motor current conversion—provides load trend visualization without external sensors
• Self-locking chuck mechanism enables tool-free impeller installation and rapid shaft exchange (compatible with 0.5–10 mm diameter rods)
• Hollow shaft design (10.2 mm internal diameter) accommodates temperature probes, pH electrodes, or sampling lines during active stirring
• Programmable timer with 99 h 59 min 59 sec resolution supports unattended long-duration experiments under defined operational windows
• Three-color status LED (blue = standby, green = running, red = fault/alarm) offers immediate visual system feedback

Sample Compatibility & Compliance

The WOHS-60 Pro handles aqueous and organic media up to 100 L volume and viscosities up to 85,000 mPa·s—suitable for applications ranging from low-viscosity buffer preparation to high-solids slurry agitation. It meets mechanical safety requirements per EN 61010-1:2019 for laboratory equipment and includes thermal cut-off protection to prevent motor overheating during prolonged high-torque operation. While not intrinsically rated for hazardous area use, its robust construction and isolation design make it suitable for general-purpose chemical synthesis labs operating under ISO/IEC 17025-accredited quality systems. All firmware operations adhere to GLP-compliant logging principles, supporting audit-ready documentation when integrated with validated LIMS platforms.

Software & Data Management

The WOHS-60 Pro operates as a standalone instrument with no proprietary software dependency. All operational parameters—including speed setpoint, elapsed time, torque trend, and measured temperature—are stored locally in non-volatile memory and displayed in real time. For traceability-critical environments, optional RS-232 or analog 0–10 V output interfaces (available via accessory module) enable integration into SCADA systems or data acquisition hardware compliant with FDA 21 CFR Part 11 requirements. Exported logs retain timestamped metadata and are compatible with common CSV parsing tools for post-processing in MATLAB, Python (Pandas), or LabVIEW environments.

Applications

• Chemical synthesis: Controlled addition and mixing during Grignard, esterification, or catalytic hydrogenation reactions
• Materials science: Dispersion of nanomaterials (e.g., graphene oxide, metal oxides) in polymer matrices
• Pharmaceutical development: API crystallization, suspension formulation, and dissolution testing per USP
• Food & beverage R&D: Emulsion stabilization, dough rheology assessment, and fermentation broth homogenization
• Environmental analysis: Digestion of solid samples in EPA Method 3050B-compliant acid leaching protocols

FAQ

Does the WOHS-60 Pro support external temperature probe input?
Yes—its hollow shaft (10.2 mm ID) is designed to route PT100 or thermocouple probes directly into the stirred medium; the unit reads and displays temperature values natively.
Can the stirrer be operated inside a temperature-controlled chamber?
It is rated for ambient operation between 5–40 °C and relative humidity ≤80% non-condensing; chamber integration requires verification of airflow and cable routing to maintain IP42 integrity.
Is torque calibration traceable to national standards?
Torque is derived from motor current measurement and is not independently calibrated; however, speed accuracy (≤±3% above 300 rpm) is verified per factory test report with NIST-traceable tachometer reference.
What impeller types are recommended for high-viscosity applications?
Anchor, helical ribbon, and double-helix impellers mounted on rigid shafts (≥6 mm diameter) are optimal for viscosities >20,000 mPa·s; avoid flexible or plastic blades at speeds >500 rpm.
How is firmware updated?
Firmware remains static per production batch; updates are only issued following regulatory-mandated safety revisions and distributed via WIGGENS-certified service centers—not end-user downloadable packages.