CZGY 8S-1 Magnetic Stirrer

Overview

The CZGY 8S-1 Magnetic Stirrer is a compact, analog-controlled benchtop instrument engineered for reliable and quiet magnetic agitation of liquid samples in standard laboratory environments. Operating on the principle of rotating magnetic field coupling—where a rotating permanent magnet beneath the non-magnetic ceramic or stainless-steel plate induces synchronous rotation of a PTFE- or glass-coated magnetic stir bar immersed in the sample—the 8S-1 delivers consistent torque transfer without mechanical contact between drive mechanism and vessel. Its brushless motor design eliminates commutator wear and audible noise, while the absence of external moving parts ensures minimal vibration transmission to sensitive setups such as analytical balances or optical benches. Designed for routine mixing tasks—not temperature control—the unit complies with IEC 61010-1 safety standards for electrical equipment used in laboratory settings, featuring a grounded chassis and overvoltage tolerance within ±10% of nominal 220 V AC input.

Key Features

• Continuously variable speed control (0–1600 rpm) via precision analog potentiometer, enabling fine-tuned adjustment for low-viscosity solvents or higher-density suspensions
• 120 mm diameter corrosion-resistant top plate optimized for stable placement of beakers up to 1000 mL capacity
• 25 W energy-efficient motor with thermal protection circuitry to prevent coil overheating during extended operation
• No integrated heating element—intentionally designed for applications requiring mechanical agitation only, eliminating thermal drift concerns in temperature-sensitive protocols
• Grounded metal housing with dedicated earth terminal to mitigate electrostatic buildup and ensure operator safety per IEC 61010-1 Class I requirements
• Low-profile form factor (approx. 75 mm height) for compatibility with fume hoods, glove boxes, and stacked lab furniture configurations

Sample Compatibility & Compliance

The 8S-1 accommodates standard borosilicate glassware including beakers (50–1000 mL), Erlenmeyer flasks, and crystallizing dishes. Stir bar selection must match vessel geometry and fluid viscosity: cylindrical bars (e.g., 30 × 8 mm) for general use; oval or cross-shaped bars for viscous media. The unit is not rated for use with flammable solvents in unventilated enclosures or conductive/acidic solutions that may compromise plate integrity. It meets basic electrical safety compliance for non-medical, non-explosion-proof laboratory environments. While not certified to ISO/IEC 17025 or GLP-specific validation protocols, its operational consistency supports documentation practices required for internal QC workflows under ISO 9001 or FDA-aligned SOPs.

Software & Data Management

The 8S-1 operates as a standalone analog device with no embedded microcontroller, firmware, or digital interface. Consequently, it does not generate electronic audit trails, store operational logs, or support remote monitoring—making it suitable for environments where regulatory emphasis lies on procedural control rather than automated data capture (e.g., teaching labs, preliminary screening assays, or preparatory chemistry workflows). Speed settings are manually recorded alongside experimental notes; no software installation, calibration certificates, or cybersecurity considerations apply. This architecture minimizes failure points and aligns with ALCOA+ principles for raw data integrity when paired with handwritten or LIMS-integrated lab notebooks.

Applications

• Homogenization of aqueous buffers, salt solutions, and dilute polymer dispersions prior to filtration or analysis
• Preparation of reagent stock solutions in environmental testing (e.g., EPA Method 300.0), clinical diagnostics, and pharmaceutical excipient blending
• Supporting dissolution testing where thermal input is excluded per USP stage requirements
• Agitation during titration setups, pH adjustments, or redox reactions requiring gentle yet uniform mixing
• Use in undergraduate chemistry laboratories for kinetics experiments where reproducible rotational input is essential but temperature modulation is unnecessary

FAQ

Does the 8S-1 include a heating function?
No. The 8S-1 is a non-heating magnetic stirrer. Temperature control requires integration with an external hotplate or water bath.
What is the recommended stir bar size for optimal performance at 1000 mL volume?
A 40 mm × 8 mm cylindrical PTFE-coated stir bar is empirically validated for stable rotation across the full speed range in tall-form 1000 mL beakers.
Can the unit operate continuously at maximum speed?
Continuous operation at 1600 rpm is limited to 4 hours to maintain motor longevity and thermal stability; medium-speed operation (≤800 rpm) supports 8-hour duty cycles.
Is the top plate chemically resistant?
The surface is electroplated steel or ceramic-coated metal—resistant to water and mild aqueous solutions, but not compatible with strong acids, halogenated solvents, or abrasive cleaning agents.
Does the 8S-1 comply with FDA 21 CFR Part 11?
No. As a purely analog device with no electronic data generation, storage, or user authentication, it falls outside the scope of Part 11 requirements.