IKA Midi MR 1 digital Magnetic Stirrer

Overview

The IKA Midi MR 1 digital is a high-performance, microprocessor-controlled magnetic stirrer engineered for precision mixing in demanding laboratory environments. Designed without integrated heating—making it ideal for temperature-sensitive applications or setups where external heating sources (e.g., water baths or heating mantles) are preferred—the device employs robust Couette-flow coupling between the rotating magnetic field and the stir bar to ensure consistent torque transmission across its full speed range. Its 19 W brushless DC motor delivers stable rotational dynamics up to 1000 rpm with minimal thermal drift and low electromagnetic interference, supporting reproducible homogenization of volumes up to 50 L of aqueous media. The unit’s rigid stainless steel (1.4301) work surface provides long-term corrosion resistance and mechanical stability under repeated load cycling, while its compact footprint (360 × 110 × 430 mm) enables seamless integration into fume hoods, laminar flow cabinets, or multi-instrument benchtop configurations.

Key Features

• Microprocessor-based speed control with digital LED display for real-time rpm readout and precise setting resolution (1 rpm increments)
• Stepless speed regulation from 0 to 1000 rpm, optimized for both low-shear suspension of particulates and high-torque dispersion of viscous media
• Integrated timer function offering programmable operation from 0 to 56 minutes, or indefinite continuous mode for unattended overnight protocols
• Dual communication interfaces—RS232 and USB—for direct connection to laboratory PCs, enabling remote parameter adjustment, data logging, and instrument synchronization via IKA Labworldsoft software
• IP21-rated enclosure per DIN EN 60529, providing protection against vertically falling drips and solid objects ≥12.5 mm, suitable for general-purpose wet-lab use
• No internal heating element—eliminates thermal cross-talk, avoids condensation risks in sealed vessels, and supports compatibility with glassware rated for cryogenic or elevated external temperatures

Sample Compatibility & Compliance

The Midi MR 1 digital accommodates standard PTFE- or glass-coated stir bars up to 80 mm in length, ensuring optimal coupling efficiency across vessel diameters from 50 mL beakers to 50 L jacketed reactors. Its flat, non-porous stainless steel plate minimizes residue retention and facilitates rapid decontamination—critical for GMP-compliant QC labs handling pharmaceutical intermediates or clinical assay reagents. The device complies with IEC 61010-1 for electrical safety in laboratory equipment and meets EMC requirements per EN 61326-1. While not intrinsically rated for hazardous areas, its design aligns with ISO/IEC 17025 documentation practices for instrument qualification (IQ/OQ), and audit trails generated via Labworldsoft support FDA 21 CFR Part 11-compliant electronic records when deployed with validated system configurations.

Software & Data Management

Control and monitoring are extended through IKA Labworldsoft—a platform certified for GLP/GMP workflows—enabling protocol-driven operation, event-triggered data capture, and timestamped parameter logs. USB connectivity allows plug-and-play recognition on Windows/Linux systems without proprietary drivers; RS232 provides legacy serial integration for SCADA or LIMS environments. All speed and timer settings are stored in non-volatile memory, preserving user-defined presets after power cycling. Export functions support CSV and XML formats, facilitating traceability in analytical method validation packages and regulatory submissions requiring full instrument usage history.

Applications

• Preparation of homogeneous buffer solutions and titrant stocks in analytical chemistry labs
• Cell culture media conditioning prior to sterile filtration in bioprocessing workflows
• Dispersion of nanomaterial suspensions (e.g., TiO₂, SiO₂ colloids) where thermal stability is critical
• Long-duration dissolution testing per USP using externally heated vessels
• Reaction mixture agitation during kinetic studies monitored by in-line FTIR or Raman probes
• Environmental sample homogenization (e.g., wastewater slurry, soil extracts) prior to ICP-MS analysis

FAQ

Does the Midi MR 1 digital include a heating function?
No. This model is a dedicated magnetic stirrer without integrated heating—designed specifically for applications requiring independent thermal control.
What is the maximum recommended vessel diameter for stable operation at 1000 rpm?
For optimal vortex formation and stir bar tracking, vessels with internal diameters ≤250 mm are recommended at top speed; larger volumes should be operated at ≤750 rpm to maintain coupling integrity.
Can the device be integrated into automated lab platforms?
Yes—via RS232 or USB, the unit supports command-line SCPI-like syntax for triggering start/stop, adjusting speed, and reading status flags within custom Python, LabVIEW, or PLC-based control architectures.
Is calibration required before first use?
No factory calibration is needed; however, users performing regulated work must conduct operational qualification (OQ) per their SOPs—including speed accuracy verification using a calibrated tachometer and timer validation across the full 0–56 minute range.
What stir bar specifications ensure optimal performance?
Use elliptical or cylindrical PTFE-coated stir bars 60–80 mm in length and 8–12 mm in diameter; avoid magnetically shielded or oversized bars that may saturate the drive field or induce wobble at high rpm.