IKA RW 28 digital Overhead Stirrer

Overview

The IKA RW 28 digital is a high-performance overhead stirrer engineered for precision mixing and dispersion tasks in research laboratories, quality control environments, and pilot-scale production settings. Designed around a robust mechanical drive architecture, it employs a high-torque DC motor coupled with a planetary gear reduction system to deliver consistent rotational force across its full speed range. Unlike electronically commutated (EC) or servo-driven units, the RW 28 digital utilizes a mechanically regulated speed control mechanism—ensuring stable torque delivery even under sudden load fluctuations typical when processing non-Newtonian or shear-thinning fluids. Its dual-range gearbox (I and II) enables optimized performance across low-speed, high-viscosity applications (e.g., polymer melts, pastes, and gels) and higher-speed homogenization tasks (e.g., emulsions or suspensions). With a maximum stirring capacity of 80 L in water-equivalent media and rated capability up to 50,000 mPa·s, the unit meets the operational demands of both routine analytical workflows and process development studies.

Key Features

• Two mechanically selectable speed ranges (I and II) for application-specific torque/speed optimization
• Digital LED display showing real-time rpm with ±1 rpm setting resolution and ±10 rpm measurement tolerance
• Hollow stainless-steel stirring shaft (ID 10.5 mm) permitting in-situ insertion of temperature probes, pH electrodes, or sampling needles without interrupting operation
• Integrated thermal cut-off switch providing automatic motor protection against overheating during extended duty cycles
• Overload detection circuitry with alphanumeric error code display for rapid diagnostics and maintenance response
• Ergonomic cast-aluminum housing with thermoplastic polymer coating for chemical resistance, mechanical durability, and operator safety
• IP40-rated enclosure compliant with DIN EN 60529 for protection against solid objects ≥1 mm and limited ingress of vertically falling water droplets
• Low-noise operation (62.5 dB(A) without disperser head), suitable for shared laboratory spaces requiring acoustic compatibility

Sample Compatibility & Compliance

The RW 28 digital accommodates a broad spectrum of sample types—from low-viscosity aqueous solutions to highly viscous organogels, ceramic slurries, and pharmaceutical ointments—provided appropriate impeller geometry and shaft length are selected. Its fixed collet chuck accepts standard stirring rods from Ø1 to 10 mm, supporting common configurations including anchor, paddle, turbine, and helical ribbons. The unit complies with essential electrical safety standards including IEC 61010-1 (Laboratory Equipment) and carries CE marking for use within the European Economic Area. While not intrinsically rated for hazardous area deployment, its construction supports integration into GLP-compliant workflows where traceability, equipment qualification (IQ/OQ), and environmental monitoring (temperature/humidity) are documented per ISO/IEC 17025 requirements.

Software & Data Management

As a standalone mechanical instrument, the RW 28 digital does not incorporate embedded firmware or network connectivity. All operational parameters—including speed setpoint, active range selection, and fault status—are managed locally via front-panel controls and visual indicators. For laboratories operating under FDA 21 CFR Part 11 or EU Annex 11 regulatory frameworks, manual logbook entries or external data acquisition systems (e.g., LabVIEW or custom SCADA interfaces via analog tachometer output) may be employed to capture and archive operational metadata. Optional accessories—including vessel clamps, splash guards, and height-adjustable support stands—facilitate repeatable setup conditions required for method validation and inter-laboratory reproducibility studies.

Applications

• Batch mixing of viscous polymer formulations prior to rheological characterization
• Homogenization of catalyst suspensions in fine chemical synthesis
• Preparation of uniform pharmaceutical suspensions and semi-solid dosage forms
• Stirring of cell culture media under controlled temperature and aeration conditions
• Dispersion of nanomaterials in solvent-based matrices for material science prototyping
• Process simulation in pilot plants replicating industrial agitation profiles

FAQ

Is the RW 28 digital compatible with third-party stirring rods and impellers?

Yes—the fixed collet chuck accepts any standard cylindrical stirring rod with diameters between 1 mm and 10 mm, enabling interoperability with OEM and aftermarket components.
Can the unit operate continuously for 24 hours?

It is rated for 100% duty cycle under nominal load conditions; however, continuous operation at maximum torque or ambient temperatures above 35 °C requires active ventilation and periodic thermal monitoring.
Does the hollow shaft support simultaneous temperature measurement during stirring?

Yes—the 10.5 mm internal diameter allows insertion of standard Pt100 sensors or thermocouples while the shaft remains stationary or rotating, enabling real-time thermal feedback without mechanical interference.
What safety certifications does the RW 28 digital hold?

It conforms to IEC 61010-1:2010 for electrical safety in laboratory equipment and bears CE, GS, and UKCA markings where applicable.
Is remote control or PC interface available?

No native digital interface is provided; however, analog tachometer output (0–10 V) is accessible via terminal block for external speed monitoring and logging systems.