JeioTech MS-17G/22G Digital Magnetic Stirrer

Overview

The JeioTech MS-17G and MS-22G are precision-engineered digital magnetic stirrers designed for reproducible, low-noise mixing in academic, pharmaceutical, and industrial laboratory environments. Operating on the principle of magnetic coupling—where a rotating permanent magnet beneath the top plate induces synchronous rotation of a submerged magnetic stir bar—the units deliver consistent torque transfer without mechanical contact, eliminating wear, sparking, or contamination risks associated with direct-drive systems. These models are strictly non-heating stirrers, optimized for ambient-temperature applications requiring stable rotational control across wide viscosity ranges and vessel geometries. Their brushless DC motor architecture ensures long-term reliability, thermal stability, and electromagnetic compatibility (EMC) compliant with IEC 61326-1. The absence of integrated heating elements aligns them with ISO/IEC 17025-compliant workflows where thermal drift must be excluded from mixing variables.

Key Features

• High-resolution vacuum fluorescent display (VFD) with intuitive touch-sensitive controls for real-time speed and timer readout
• PID feedback-controlled speed regulation enabling ±1% repeatability across the full 30–2000 rpm range
• Programmable digital timer (1 minute to 99 hours 59 minutes) with auto-stop function for unattended operation
• Robust magnetic coupling system rated for continuous operation with stir bars up to 10×50 mm (0.39×1.97 in), supporting viscous solutions up to 5 L water-equivalent volume
• Ergonomic, lightweight polypropylene housing (IP42-rated) with integrated rubber feet and chemical-resistant surface finish
• Removable anti-slip silicone top plate covers (available in white or black) for enhanced vessel stability and easy decontamination
• Integrated safety circuitry including thermal cutoff at ≥70°C and electronic overcurrent protection
• M10 threaded mounting holes compatible with standard lab support rods (e.g., MTT0132) and universal clamping accessories (C-5, C-7, C-10)

Sample Compatibility & Compliance

The MS-17G/22G accommodates a broad range of vessel types—including glass beakers, Erlenmeyer flasks, and cylindrical reactors—up to 5 L capacity when used with appropriately sized stir bars. Its non-heating design avoids thermal artifacts during kinetic studies, buffer equilibration, reagent dissolution, or cell culture media preparation. The unit complies with DIN EN 60529 (IP42) for protection against solid objects >1 mm and vertically falling drops, making it suitable for use in controlled cleanroom environments (ISO Class 7–8) and GLP-regulated labs. While not certified for hazardous locations (ATEX/IECEx), its brushless motor and sealed electronics meet general-purpose electrical safety requirements per IEC 61010-1. No internal heating element means no calibration traceability to temperature standards (e.g., ASTM E2251); thus, users retain full control over thermal parameters via external baths or incubators.

Software & Data Management

These stand-alone instruments operate without proprietary software or PC connectivity. All operational parameters—including speed setpoint, elapsed time, and remaining timer duration—are displayed locally on the VFD screen and retained through power cycles. The PID controller logs no internal data; however, the precise repeatability of speed and timing enables integration into validated workflows under FDA 21 CFR Part 11 when paired with external electronic lab notebooks (ELNs) or LIMS systems that capture operator inputs and timestamps manually or via barcode-scanned run records. Audit trails for maintenance and calibration (e.g., annual speed verification using NIST-traceable tachometers) must be maintained per laboratory quality management system (QMS) requirements.

Applications

• Preparation of homogeneous aqueous and organic solutions in QC/QA testing laboratories
• Buffer and reagent mixing prior to HPLC, GC, or spectrophotometric analysis
• Cell suspension handling in bioprocessing workflows where shear sensitivity mandates gentle agitation
• Supporting dissolution testing per USP when coupled with temperature-controlled water baths
• Long-duration reactions requiring stable rotational input without thermal interference
• Education and training labs where durability, intuitive interface, and safety are primary selection criteria

FAQ

Does this stirrer include a heating function?
No. The MS-17G and MS-22G are ambient-temperature-only magnetic stirrers. They do not incorporate heating elements or temperature sensors.
What is the maximum recommended viscosity for reliable stirring?
While rated for up to 5 L of water (≈1 cP), performance with higher-viscosity fluids (e.g., glycerol, polymer solutions) depends on stir bar geometry and vessel shape. For viscosities >100 cP, use larger-diameter elliptical or cross-shaped stir bars (e.g., BCW1630, BCW1640) and reduce speed accordingly.
Can the unit be mounted vertically or inverted?
No. The magnetic drive system and thermal management are orientation-dependent. Units must be operated horizontally on a stable, level surface.
Is the VFD display readable under bright laboratory lighting?
Yes. The vacuum fluorescent display provides high contrast and wide viewing angles, maintaining legibility under standard LED or fluorescent lab illumination.
Are replacement stir bars and accessories available with documented material certifications?
Yes. PTFE-coated and PTFE-only stir bars (e.g., BCW41xxx series) are supplied with RoHS and REACH declarations. Silicone top plate covers comply with USP Class VI biocompatibility testing upon request.