IKA RW 47 digital Overhead Stirrer
| Brand | IKA |
|---|---|
| Origin | Germany |
| Manufacturer | IKA-Werke GmbH & Co. KG |
| Type | Digital Overhead Mechanical Stirrer |
| Max. Mixing Volume (H₂O) | 200 L |
| Speed Range | 57–1300 rpm |
| Motor Output Power | 370 W |
| Max. Torque (at 60 rpm) | 4642 N·cm |
| Max. Viscosity | 100,000 mPa·s |
| IP Rating | IP54 |
| Input Voltage | 3 × 400 V / 3 × 230 V, 50 Hz |
| Dimensions (W×H×D) | 145 × 465 × 358 mm |
| Weight | 16 kg |
| Ambient Operating Conditions | 5–40 °C, ≤80 % RH |
Overview
The IKA RW 47 digital is a high-performance overhead mechanical stirrer engineered for precision mixing and dispersion of demanding samples in laboratory and pilot-scale environments. Based on robust electromagnetic torque transmission and constant-power drive architecture, it delivers consistent rotational energy across its full speed range — from low-speed, high-torque agitation of viscous polymer melts or ceramic slurries to high-shear homogenization of emulsions and suspensions. Its three-phase motor design ensures stable operation under continuous load, while the integrated thermal protection system automatically limits motor temperature rise during prolonged use — a critical feature for unattended operation in GLP-compliant workflows. Designed and manufactured in Staufen, Germany, the RW 47 digital adheres to IEC 61000-6-3 (EMC) and IEC 61000-6-2 (immunity) standards, and carries CE marking in accordance with the EU Machinery Directive 2006/42/EC.
Key Features
- Dual-range, infinitely variable speed control (Range I: 57–275 rpm; Range II: 275–1300 rpm) with ±1 rpm setpoint accuracy and ±10 rpm measurement tolerance
- High-torque output: up to 4642 N·cm at 60 rpm (overload), maintaining 3000 N·cm at 100 rpm and 285 N·cm at 1000 rpm — optimized for Newtonian and non-Newtonian fluid rheology
- Digital LED display showing real-time speed, error codes, and operational status; intuitive rotary encoder interface with tactile feedback
- Cast aluminum housing with thermoplastic polymer coating for chemical resistance and mechanical durability; IP54-rated enclosure for protection against dust ingress and water splashes
- Ergonomic vertical design (465 mm height) with adjustable mounting flange for secure integration into fume hoods, reactor vessels, or custom support frames
- Stainless steel hollow shaft (13 mm internal diameter) accepting standard stirring rods (3–16 mm clamping range); optional safety guard and vessel clamping kits available
Sample Compatibility & Compliance
The RW 47 digital accommodates a broad spectrum of sample types — including shear-thinning hydrogels, thixotropic pastes, abrasive mineral suspensions, and temperature-sensitive biological media — without performance degradation. Its sealed motor housing and corrosion-resistant shaft assembly meet DIN EN 60529 requirements for IP54 environmental protection. The instrument complies with ISO 17025:2017 clause 6.4.10 regarding equipment suitability for intended use, and supports audit-ready documentation when paired with IKA Labworldsoft® (optional). It is routinely deployed in applications requiring adherence to ASTM D1824 (viscosity of adhesives), ISO 3219 (rheological properties of polymer solutions), and USP (uniformity of dosage units), where reproducible agitation is essential to method validity.
Software & Data Management
While the RW 47 digital operates as a standalone unit, it is compatible with IKA Labworldsoft® v5.0+ via RS232 interface for remote parameter setting, real-time speed logging, and event-triggered data capture. When configured with optional PC connectivity, the system supports electronic signatures, user access levels, and 21 CFR Part 11–compliant audit trails — enabling traceable operation in regulated QC/QA laboratories. All configuration changes, fault events (e.g., E01 = overload, E02 = overtemperature), and runtime statistics are timestamped and exportable in CSV format for quality review and trending analysis.
Applications
- Pilot-scale synthesis of pharmaceutical intermediates in jacketed glass reactors (up to 200 L)
- Dispersion of nanomaterials (e.g., graphene oxide, TiO₂ nanoparticles) in polymeric matrices
- Preparation of high-viscosity battery electrode slurries (NMP-based, >50,000 mPa·s)
- Homogenization of food-grade emulsions (mayonnaise, dressings) under sanitary conditions
- Rheological conditioning of cementitious grouts and geopolymer precursors prior to casting
- Controlled agitation during accelerated stability testing per ICH Q1A(R3)
FAQ
What is the maximum permissible viscosity for continuous operation?
The RW 47 digital is rated for continuous duty at viscosities up to 100,000 mPa·s when operated within its specified torque envelope and ambient conditions (5–40 °C, ≤80 % RH).
Can this stirrer be mounted directly onto a stainless steel reactor vessel?
Yes — the standardized mounting flange (DIN 28120) allows direct attachment to vessels equipped with compatible top ports; optional vessel clamps and shaft guards are available for enhanced mechanical safety.
Is the device suitable for use in explosion-proof environments?
No — the RW 47 digital is not ATEX- or IECEx-certified. For hazardous area applications, consult IKA’s EX series stirrers with intrinsically safe motor designs.
Does the unit include built-in temperature monitoring of the sample?
No — the RW 47 digital does not incorporate sample temperature sensing; external PT100 probes or IR sensors must be used in conjunction with independent temperature control systems.
What maintenance intervals are recommended for long-term reliability?
IKA recommends biannual inspection of the gear train lubrication, shaft runout verification (<0.1 mm), and functional validation of thermal cut-off circuits — documented per ISO/IEC 17025 clause 6.4.8.
