SiLe 90-1 20L High-Capacity Magnetic Stirrer

Overview

The SiLe 90-1 20L High-Capacity Magnetic Stirrer is an industrial-grade laboratory stirring system engineered for consistent, reliable mixing of low-to-medium viscosity liquids in volumes up to 20 liters. Unlike standard benchtop magnetic stirrers designed for small-volume beakers or flasks, the 90-1 integrates a high-torque DC motor (25 mN·m) and optimized magnetic coupling architecture to maintain stable rotational control across its full speed range (50–1800 rpm), even under load variations typical of large-volume reactor vessels or jacketed glassware. Its robust aluminum alloy housing and precision-machined ceramic-coated top plate provide thermal stability and chemical resistance—critical for extended operation during dissolution studies, buffer preparation, reagent homogenization, or pre-dilution workflows in QC/QA labs. The device operates without integrated heating; it is intended for use with external temperature-controlled platforms (e.g., water baths or heated stir plates) where precise thermal management is handled separately per experimental protocol.

Key Features

• High-torque magnetic drive (25 mN·m) ensures stable rotation at high speeds and under viscous load conditions
• Wide speed adjustment range (50–1800 rpm) with smooth analog control for fine-tuned process optimization
• Continuous-duty DC motor rated at 40 W, engineered for >10,000 hours of operational life under standard lab conditions
• Ceramic-coated stainless steel top plate resists corrosion from common solvents, acids, and bases (e.g., HCl, NaOH, ethanol, acetone)
• Compact footprint (308 × 303 × 135 mm) enables integration into fume hoods, laminar flow cabinets, or multi-instrument workstations
• No internal heating element—designed explicitly for compatibility with external temperature control systems to meet ISO/IEC 17025 calibration traceability requirements

Sample Compatibility & Compliance

The SiLe 90-1 supports standard laboratory glassware including round-bottom flasks (up to 20 L), tall-form cylinders, and jacketed reactors equipped with PTFE- or glass-coated magnetic stir bars (recommended bar length: 60–120 mm). It is compatible with aqueous, organic, and mildly corrosive media but not recommended for highly exothermic reactions or slurries containing abrasive particulates (>50 µm). While the unit itself carries no CE, UL, or RoHS certification documentation, its electrical design conforms to IEC 61010-1:2010 safety standards for laboratory equipment. Users deploying this stirrer in regulated environments (e.g., pharmaceutical QC labs operating under GMP or GLP) must validate performance per internal SOPs and document maintenance history—including periodic torque verification and bearing inspection—as part of their equipment qualification (IQ/OQ/PQ) protocols.

Software & Data Management

The SiLe 90-1 is a manually operated, analog-control instrument with no embedded microprocessor, digital interface, or data logging capability. Speed selection is performed via calibrated rotary potentiometer; no firmware, USB port, or RS-232 connectivity is provided. This architecture eliminates software validation burden under FDA 21 CFR Part 11 and simplifies compliance in settings requiring audit-trail-free operation. For laboratories requiring electronic speed recording or remote monitoring, the unit may be paired with third-party tachometer sensors or PLC-integrated feedback loops—though such configurations fall outside the manufacturer’s scope of supply and validation support.

Applications

• Preparation of large-volume standard solutions and calibration stock solutions in environmental and clinical chemistry labs
• Homogenization of polymer solutions, colloidal suspensions, and emulsions prior to rheological or particle size analysis
• Stirring during titration reagent conditioning and pH buffer equilibration (e.g., phosphate, Tris-HCl)
• Supporting dissolution testing per USP when used with USP Apparatus 2 (paddles) or custom vessel mounts
• Cell culture media preparation in bioprocessing R&D, where shear-sensitive components are absent
• Reaction mixture agitation in synthetic organic chemistry scale-up trials (≤20 L batch volume)

FAQ

Does the SiLe 90-1 include a built-in heater or temperature control?

No. The 90-1 is a non-heating magnetic stirrer. Temperature regulation must be achieved externally using a water bath, heating mantle, or climate-controlled chamber.
What stir bar size is recommended for optimal performance at 20 L capacity?

A dual-pole PTFE-coated stir bar measuring 100–120 mm in length and ≥12 mm in diameter is recommended for uniform vortex formation and minimal splashing in tall-form vessels.
Is the unit suitable for use with aggressive solvents like chloroform or concentrated sulfuric acid?

The ceramic-coated surface offers resistance to short-term exposure, but prolonged contact with strong oxidizers or halogenated solvents is not advised. Always consult chemical compatibility charts for PTFE and alumina ceramics before deployment.
Can the 90-1 be integrated into automated lab systems via digital control signals?

No. It features only manual analog speed adjustment and lacks any programmable logic interface, making it incompatible with LabVIEW, SCADA, or LIMS-triggered automation sequences.
What maintenance intervals are recommended for sustained performance?

Inspect magnetic coupling alignment and clean the top plate weekly; verify motor torque output annually using a calibrated torque tester per ISO 6789-2:2017 guidelines.