IKA MICROSTAR 15 digital Overhead Stirrer

Overview

The IKA MICROSTAR 15 digital is a compact, high-precision overhead stirrer engineered for consistent performance in demanding laboratory environments. Designed according to the principles of rheological mixing—where torque stability and speed reproducibility are critical—the MICROSTAR 15 digital employs a brushless DC motor architecture to eliminate carbon wear, reduce electromagnetic interference, and ensure long-term rotational accuracy. Its core function is mechanical agitation of low- to medium-viscosity liquids (up to 8,000 mPa·s), enabling homogeneous dispersion, dissolution, emulsification, and suspension across aqueous, organic, and mildly corrosive media. The device operates under constant-torque control across its full speed range (0/50–1000 rpm), maintaining mechanical output integrity regardless of load fluctuations—a key requirement for GLP-compliant process development, formulation screening, and QC batch preparation. With an IP54-rated enclosure and cast aluminum housing coated with thermoplastic polymer, it meets DIN EN 60529 standards for dust resistance and limited water ingress protection—making it suitable for shared lab benches and regulated production support areas.

Key Features

• Brushless DC motor delivering 15 N·cm maximum torque and 15.7 W shaft output power, ensuring stable agitation even during viscosity transitions or vessel geometry changes
• Precision analog knob control with real-time LED speed display (±1 rpm accuracy above 300 rpm; ±3 rpm below), optimized for tactile feedback and rapid parameter adjustment
• Hollow shaft design (8.5 mm internal diameter) allowing simultaneous insertion of temperature probes, pH electrodes, or sampling needles without interrupting mixing
• Universal clamping system accommodating stirring shafts from 0.5 mm to 8 mm diameter—compatible with standard IKA, PTFE-coated, and custom-profile impellers
• USB interface supporting firmware updates and future software integration via IKA Labworldsoft™ platform (v5.0+ compatible)
• Energy-efficient operation: 32 W nominal input power, 0.3 W standby consumption, and 100% continuous duty rating validated per IEC 60034-1

Sample Compatibility & Compliance

The MICROSTAR 15 digital is validated for use with vessels ranging from 50 mL beakers to 10 L glass or stainless-steel reactors. It supports common laboratory impeller types—including paddle, propeller, anchor, and helical ribbons—enabling scalable process transfer from R&D to pilot scale. Its torque curve is calibrated against ASTM D2196 (Standard Test Methods for Rheological Properties of Non-Newtonian Materials) and aligns with ISO 2555 (Plastics — Determination of Apparent Viscosity). While not intrinsically rated for hazardous area use, its IP54 enclosure satisfies general-purpose safety requirements under EN 61000-6-3 (EMC emission limits) and EN 61000-6-2 (immunity). No integrated temperature control is provided; external heating/cooling must be managed via jacketed vessels or immersion circulators.

Software & Data Management

Although the MICROSTAR 15 digital operates as a standalone instrument, its embedded microcontroller supports firmware upgrades via USB connection to Windows-based PCs running IKA Labworldsoft™. This enables traceable configuration logging, user-defined speed profiles, and audit-ready event timestamps—features essential for laboratories operating under FDA 21 CFR Part 11 or EU Annex 11 requirements. The device does not generate raw data streams but records operational parameters (e.g., runtime, setpoint, actual speed) in non-volatile memory for retrieval during maintenance audits. All firmware versions comply with IKA’s ISO 9001-certified development lifecycle and include cryptographic signature verification to prevent unauthorized modification.

Applications

• Pharmaceutical pre-formulation studies requiring reproducible shear history for suspension stability assessment
• Chemical synthesis where stoichiometric homogeneity depends on controlled mass transfer rates
• Food & beverage R&D involving viscosity-sensitive emulsions (e.g., dressings, sauces, dairy alternatives)
• Materials science labs preparing nanoparticle dispersions in solvent systems up to 8,000 mPa·s
• Environmental testing protocols involving sediment resuspension or reagent dissolution in standardized aqueous matrices

FAQ

Does the MICROSTAR 15 digital support remote control or RS232 communication?
No—it features only a USB port for firmware updates, not real-time command-and-control or data streaming.
Can this stirrer be mounted on third-party stands?
Yes, its 13 mm diameter extension arm is compatible with standard lab clamps meeting ISO 8513 specifications.
Is the hollow shaft sealed against liquid ingress when probes are inserted?
No—the hollow shaft is mechanically open; users must apply appropriate probe seals or use drip shields in wet environments.
What impeller geometries are recommended for maximum efficiency at 1000 rpm?
Propeller-type impellers with balanced mass distribution (e.g., IKA RW 20, RW 35) are advised to minimize vibration-induced bearing wear.
How often does the unit require calibration verification?
IKA recommends annual speed and torque verification using traceable metrology equipment per ISO/IEC 17025 guidelines.