HsiangTai SAR-301 Advanced Digital Programmable Stirrer

Overview

The HsiangTai SAR-301 is a precision-engineered digital programmable stirrer designed for reproducible, high-stability mixing and dispersion tasks in analytical, pharmaceutical, chemical, and materials laboratories. Utilizing a brushless DC motor architecture, it delivers consistent rotational output across its full speed range (0–3000 rpm), minimizing mechanical wear, thermal drift, and acoustic emissions—critical for long-duration or sensitive experiments requiring stable shear profiles. Unlike brushed motor systems, the SAR-301’s electronic commutation ensures uniform torque delivery regardless of load fluctuations, enabling reliable operation with viscous or heterogeneous samples. Its closed-loop feedback control continuously monitors current draw and rotor position to dynamically adjust power output, maintaining set speed within ±1% deviation under variable viscosity conditions—a performance benchmark aligned with ISO 8503-2 and ASTM D2196 standards for mixing equipment validation.

Key Features

• Brushless DC motor with integrated thermal, overvoltage, and overcurrent protection circuits—ensuring operational safety and extended service life.
• Digital real-time display of both rotational speed (rpm) and torque (kgf·cm/N·m), enabling precise process monitoring and documentation.
• Programmable bidirectional rotation with user-selectable auto/manual reversal mode—ideal for deagglomeration, suspension homogenization, or emulsion stabilization protocols.
• Ergonomic tilting base design (adjustable angle up to ±15°) supports non-vertical mixing geometries required for specific reactor configurations or custom vessel setups.
• Tool-free quick-release chuck with hollow shaft design allows vertical adjustment of the stir rod without disassembly—reducing setup time and alignment error.
• Integrated timer function (0–99 h 59 min) with audible end-of-cycle alert; supports both continuous and interval-based operation modes.
• Robust aluminum alloy housing and reinforced stainless steel support post (Ø19 mm × 800 mm) provide mechanical stability during high-torque operation at elevated speeds.

Sample Compatibility & Compliance

The SAR-301 accommodates standard laboratory glassware (e.g., beakers, flasks, jacketed reactors) up to 10 L volume capacity, compatible with aqueous, organic, and mildly corrosive media when used with chemically resistant stir rods (e.g., PTFE-coated, glass, or SS316). Its torque output (0.25 N·m) is calibrated for Newtonian and moderately non-Newtonian fluids (e.g., polymer solutions, colloidal suspensions, cell culture media). The device complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets CE marking requirements for EMC (EN 61326-1) and low-voltage directive (2014/35/EU). While not certified for hazardous area use (ATEX/IECEx), it is suitable for general-purpose GMP/GLP environments where audit-ready operational logs are maintained manually or via external data capture.

Software & Data Management

The SAR-301 operates as a standalone instrument with no embedded firmware update capability or USB/RS-232 connectivity. All operational parameters—including speed, torque, direction, timer status, and runtime—are displayed locally on the LED interface and retained only during active operation. For regulatory-compliant workflows (e.g., FDA 21 CFR Part 11), users must implement external logging via video recording, manual entry into ELN systems, or integration with third-party DAQ hardware (e.g., analog voltage output adapters, optional upon request from authorized distributors). Calibration certificates traceable to NIST standards are available per unit upon request and include verification of speed accuracy, torque linearity, and timer repeatability under defined load conditions.

Applications

• Preparation of homogeneous buffer solutions and reagent stocks in QC/QA labs.
• Mixing of high-viscosity formulations (e.g., hydrogels, ointments, adhesives) in pharmaceutical development.
• Suspension of nanoparticles or microspheres in nanomaterial synthesis and characterization studies.
• Controlled agitation during dissolution testing (USP Apparatus II compliance achievable with appropriate vessel adaptation).
• Cell culture media conditioning and pH equilibration prior to bioreactor inoculation.
• Accelerated stability testing where consistent shear history must be replicated across multiple batches.

FAQ

Does the SAR-301 support external communication protocols (e.g., RS-232, USB, or Ethernet)?

No—the SAR-301 is a self-contained analog/digital hybrid instrument without serial or network interfaces. Data export requires manual transcription or third-party signal acquisition.
Is the torque reading calibrated and traceable?

Yes—factory calibration includes torque verification at three points (25%, 50%, 100% of max) using certified deadweight standards; calibration report available upon request.
Can the SAR-301 be used with jacketed reactors requiring temperature control?

Yes—its zero-integrated heating/cooling function means it imposes no thermal interference; compatibility depends solely on mechanical coupling and stir rod material selection.
What maintenance is required for long-term reliability?

Annual inspection of chuck integrity, motor bearing noise profile, and electrical insulation resistance (≥2 MΩ) is recommended per IEC 61010 maintenance guidelines.
Are spare parts (e.g., chucks, impellers, stir rods) available through global distribution channels?

Yes—HsiangTai maintains an international spare parts catalog; standard components (No.8 impeller, Ø8 stir rods) are stocked by regional distributors in North America, EU, and APAC regions.