HsiangTai ST-202 High-Speed Digital Electric Stirrer

Overview

The HsiangTai ST-202 High-Speed Digital Electric Stirrer is an engineered laboratory stirring system designed for precise, reproducible mixing and dispersion of low-to-medium viscosity liquids in volumes up to 5 L. Built upon a robust DC motor architecture delivering 210 W of continuous output power, the ST-202 employs Couette-type shear-driven agitation—ideal for applications requiring consistent rotational energy transfer without cavitation or vortex instability. Its core function relies on controlled angular momentum transmission through a rigid stainless steel drive shaft, enabling stable torque delivery across its full 200–3,000 rpm operating range. Unlike basic AC-powered stirrers subject to line-frequency drift, the ST-202’s digitally regulated DC drive ensures minimal speed fluctuation (< ±1% at setpoint), critical for kinetic studies, solubilization protocols, and suspension homogenization where shear history directly impacts particle aggregation behavior.

Key Features

• Digital LED speed display with real-time rpm readout for traceable process monitoring and documentation.
• Spring-loaded vertical height adjustment mechanism—enabling rapid, tool-free positioning of the stirring element within vessels of varying geometry and depth.
• Infinite variable speed control with active torque compensation: maintains nominal rpm under increasing load, preventing stall during viscous transitions or powder wetting phases.
• Integrated dual-layer safety architecture: electronic overcurrent cutoff, thermally triggered motor shutdown, and redundant fuse protection compliant with IEC 61010-1 Class II requirements.
• Standardized stainless steel components—including 8 mm Ø × 500 mm shaft, No. 11 impeller (50 mm diameter), and precision-machined chuck—resistant to corrosion from aqueous, organic, and mildly acidic media.
• Low-noise operation (< 58 dB(A) at 1 m) achieved via balanced rotor dynamics and vibration-damped base housing, suitable for shared lab environments and noise-sensitive analytical workflows.

Sample Compatibility & Compliance

The ST-202 accommodates a broad spectrum of sample types—including aqueous buffers, polymer solutions, colloidal suspensions, emulsions, and low-viscosity organic solvents—within glass, stainless steel, or polypropylene containers up to 5 L capacity. Its mechanical design conforms to ISO 8573-1 for clean air compatibility when used in ventilated enclosures, and all electrical subsystems meet CE marking requirements per EN 61326-1 (EMC) and EN 61010-1 (safety). While not intrinsically rated for hazardous area use, optional grounding kits and ESD-safe accessories are available for compliance with laboratory-specific GLP/GMP environmental controls. The device supports audit-ready operation when paired with external data loggers compatible with RS-232 or analog voltage output interfaces.

Software & Data Management

The ST-202 operates as a standalone instrument with no embedded firmware or proprietary software dependency. Speed setpoints and runtime are manually configured via front-panel rotary encoder; however, its analog tachometer output (0–10 V DC proportional to rpm) and digital TTL-compatible pulse signal enable seamless integration into third-party SCADA systems, LIMS platforms, or custom LabVIEW/Python-controlled experimental rigs. For regulatory environments requiring electronic records, users may deploy validated external acquisition hardware to capture timestamped speed traces, aligning with FDA 21 CFR Part 11 principles when paired with appropriate audit trail configuration and user access controls.

Applications

• Preparation of homogeneous reagent solutions and calibration standards in QC/QA laboratories.
• Kinetic dissolution testing of pharmaceutical powders under USP and guidance.
• Emulsion formation and stabilization trials in food science and cosmetic R&D.
• Cell culture media conditioning and buffer equilibration prior to sterile filtration.
• Supporting ASTM D2196 and ISO 2557-2 viscosity measurement workflows where consistent pre-shear conditioning is required.
• Dispersion of nanomaterials (e.g., graphene oxide, TiO₂ nanoparticles) in aqueous carriers for subsequent characterization by DLS or TEM.

FAQ

Does the ST-202 support temperature-controlled stirring?
No—the ST-202 is a dedicated stirring unit without integrated heating or cooling functionality. It is intended for use with external thermostatted baths or jacketed vessels.
Can the ST-202 be operated continuously for extended periods?
Yes—its thermal management system and brushless DC motor design permit uninterrupted operation up to 8 hours at ≤2,500 rpm under ambient conditions (25 °C, 50% RH).
Is the No. 11 impeller suitable for high-shear dispersion tasks?
The No. 11 blade provides moderate shear intensity; for demanding dispersion (e.g., carbon black in rubber compounds), optional high-shear impellers (e.g., anchor, dissolver disc) are available as accessories.
What maintenance is required for long-term reliability?
Routine inspection of chuck tightness, shaft runout (< 0.1 mm), and bearing smoothness every 500 operational hours is recommended. Lubrication is not required—the sealed motor bearings are lifetime greased.
Is technical documentation available in English with calibration procedures?
Yes—English-language operation manuals, mechanical drawings, and traceable calibration guidelines (per ISO/IEC 17025 principles) are provided with each unit shipment.