CZGY GY-CJ20L Heavy-Duty Magnetic Stirrer

Overview

The CZGY GY-CJ20L Heavy-Duty Magnetic Stirrer is an industrial-grade laboratory mixing instrument engineered for consistent, high-torque agitation of large-volume liquid samples under controlled conditions. Designed around the principle of magnetic coupling—where a rotating permanent magnet beneath the work surface induces synchronized rotation of a PTFE- or glass-coated magnetic stir bar immersed in the vessel—the GY-CJ20L eliminates mechanical shaft penetration, ensuring leak-free operation and minimizing contamination risk. Its brushless DC motor delivers stable rotational output across the full 100–2000 rpm range, with minimal thermal drift and no carbon brush wear, supporting extended unattended operation. The unit is optimized for applications requiring homogeneous dispersion, dissolution, or temperature equilibration in volumes up to 20 L—making it suitable for preparative chemistry, bioprocess buffer formulation, environmental sample homogenization, and QC batch mixing in regulated environments.

Key Features

• Fully stainless steel construction (304 grade), including housing, base, and 35 × 35 cm work surface—resistant to corrosion, solvents, and repeated sterilization cycles
• Brushless DC motor providing high starting torque, low noise (20,000-hour service life without maintenance
• Backlit LCD interface with real-time RPM display, digital speed setting, and programmable timer (0–9999 minutes or hours)
• Integrated thermal protection circuitry that automatically suspends operation if internal temperature exceeds safe thresholds
• Wide-speed capability (100–2000 rpm) with ≤±2% speed accuracy across the entire range, verified per ISO 8573-1 calibration traceability protocols
• Non-slip silicone feet and reinforced chassis design ensure stability during high-viscosity or off-center vessel operation

Sample Compatibility & Compliance

The GY-CJ20L accommodates standard laboratory glassware—including beakers (up to 20 L), jacketed reactors, and custom stainless steel vessels—provided the stir bar diameter and length are matched to fluid viscosity and container geometry (e.g., 40–80 mm bars recommended for ≥10 L volumes). It supports use with aqueous, organic, and mildly acidic/basic solutions; compatibility with aggressive halogenated or fluorinated solvents requires verification of stir bar coating integrity. While not certified to IEC 61000-6-3 (EMC) or UL 61010-1 out-of-the-box, the device meets CE marking requirements for laboratory equipment when operated within specified ambient conditions (10–40 °C, <80% RH non-condensing). Its design aligns with general Good Laboratory Practice (GLP) expectations for equipment qualification—users may perform IQ/OQ protocols using NIST-traceable tachometers and documented speed/temperature mapping.

Software & Data Management

The GY-CJ20L operates as a standalone instrument with no embedded firmware-based data logging or network connectivity. All operational parameters—including set speed, elapsed time, and active timer mode—are retained on the LCD during power cycling. For laboratories requiring audit-ready records, integration with external data acquisition systems is supported via optional analog 0–5 V or 4–20 mA output modules (sold separately), enabling connection to SCADA platforms, LabVIEW, or ELN systems. When used in FDA-regulated settings, manual log entries—capturing operator ID, batch number, start/stop timestamps, and observed RPM—constitute compliant usage documentation per 21 CFR Part 11 Annex 11 principles, provided handwritten or electronic signatures follow institutional SOPs.

Applications

• Preparation of large-volume culture media and buffer stocks in microbiology and cell therapy labs
• Homogenization of wastewater or soil leachate samples prior to ICP-MS or HPLC analysis
• Controlled dissolution testing of pharmaceutical excipients in USP Apparatus II–compatible vessels
• Continuous stirring during long-duration chemical synthesis (e.g., polycondensation, nanoparticle precipitation)
• Temperature-stabilized mixing in conjunction with external heating mantles or circulating chillers
• QC mixing of calibration standards for environmental testing (EPA Method 300.0, ISO 5667-3)

FAQ

What is the maximum recommended viscosity for reliable operation at 20 L capacity?
At full volume, optimal performance is achieved with liquids up to 500 mPa·s (e.g., 1% CMC solution); above this, use lower speeds (≤800 rpm) and longer stir bars to maintain vortex-free mixing.
Can the GY-CJ20L be used with conductive or ferromagnetic containers?
No—only non-magnetic, non-conductive vessels (e.g., borosilicate glass, PP, PTFE) ensure efficient magnetic coupling; stainless steel or aluminum containers will attenuate the field and impair stirring.
Is calibration documentation available from the manufacturer?
CZGY provides a factory-issued Certificate of Conformance (CoC) with each unit; NIST-traceable speed calibration reports are available upon request at additional cost.
Does the unit support remote start/stop or RS-232 communication?
Not natively—these functions require third-party interface hardware; contact technical support for compatible analog signal adapter specifications.
What maintenance is required for long-term reliability?
Routine cleaning of the stainless steel surface and periodic inspection of stir bar integrity; no lubrication or internal servicing is needed due to brushless motor architecture.