CZGY JJ-2QS Heavy-Duty Constant-Speed Magnetic Stirrer

Overview

The CZGY JJ-2QS Heavy-Duty Constant-Speed Magnetic Stirrer is an engineered solution for laboratories requiring consistent, high-torque agitation across a broad volume range—from small-scale reagent preparation (100 mL) to large-volume buffer or media mixing (up to 3000 mL). Designed around Couette flow principles, the unit delivers uniform rotational motion via a permanent magnet rotor driven by a brushless DC motor with optimized low-speed torque characteristics. Unlike standard stirrers that exhibit torque drop below 50 rpm, the JJ-2QS maintains stable rotational output down to 1 rpm—enabling precise control for sensitive applications such as enzymatic reaction monitoring, polymer dissolution, and viscous sample homogenization. Its robust mechanical architecture includes a reinforced aluminum alloy chassis and a 304 stainless steel top plate, ensuring long-term dimensional stability and resistance to chemical splashes, acids, and alkalis encountered in routine QC, R&D, and teaching labs.

Key Features

• High-torque, low-speed performance: Sustains rated torque output across full 1–500 rpm range without gear reduction or belt slippage.
• Digital MCU-based controller: Enables precise speed resolution of ±1 rpm and eliminates analog drift; features intuitive push-button interface with dedicated RUN/STOP, increment/decrement, and timer mode keys.
• Non-volatile parameter memory: All speed and timer settings are retained after power interruption—no reconfiguration required upon restart.
• Extended timer function: Programmable duration from 0 to 9999 minutes (≈7 days), supporting unattended overnight or multi-shift operations under controlled ambient conditions.
• Chemically inert working surface: 304 stainless steel plate resists corrosion from common solvents, buffers, and cleaning agents; compatible with autoclave-safe PTFE-coated stir bars.
• Thermal safety design: Integrated thermal cutoff prevents motor overheating during prolonged operation at maximum load; no external cooling fan required.

Sample Compatibility & Compliance

The JJ-2QS accommodates standard laboratory glassware—including beakers (50–4000 mL), Erlenmeyer flasks, and cylindrical vessels—with optimal stirring efficiency achieved using PTFE- or glass-coated magnetic stir bars (6–30 mm length). It supports ISO 8573-compliant cleanroom environments when used with appropriate stir bar sterilization protocols. While not certified for hazardous location use (e.g., ATEX or IECEx), the device complies with GB/T 29491–2013 (Chinese national standard for laboratory magnetic stirrers) and meets basic EMC requirements per EN 61326-1 for laboratory equipment. Its construction and operational logic align with GLP documentation practices—particularly through deterministic timer logging and repeatable speed calibration traceability.

Software & Data Management

This model operates as a standalone hardware instrument without embedded connectivity (e.g., USB, RS-232, or Bluetooth). However, its deterministic digital control architecture ensures full repeatability and auditability: all user inputs (speed setpoint, timer value, RUN/STOP events) are processed and executed deterministically by the onboard MCU. For regulated environments, users may integrate the JJ-2QS into broader lab data management workflows via external time-lapse video recording or manual logbook entries referencing batch ID, operator, start/stop timestamps, and observed homogeneity outcomes. Though lacking FDA 21 CFR Part 11 electronic signature capability natively, its consistent behavior supports validation protocols under ISO/IEC 17025 and ASTM E2500-13 for equipment qualification (IQ/OQ).

Applications

• Preparation of aqueous and organic-phase solutions in analytical chemistry workflows (e.g., HPLC mobile phase blending, titrant standardization).
• Cell culture media conditioning where oxygen transfer and nutrient dispersion must remain non-turbulent yet thorough.
• Accelerated stability testing of pharmaceutical suspensions and emulsions under constant agitation at defined temperatures (when paired with external water baths).
• Material science labs performing solvent-based nanoparticle dispersion prior to DLS or SEM analysis.
• Teaching laboratories demonstrating Newtonian vs. non-Newtonian fluid behavior using calibrated viscosity standards.

FAQ

Does the JJ-2QS support temperature control?
No—this is a constant-speed magnetic stirrer only. It does not include integrated heating or temperature sensing. For combined heating/stirring, consider the CZGY HH-4 series hotplate stirrers.
What is the maximum viscosity this stirrer can handle effectively?
At 500 rpm, it reliably agitates liquids up to ≈5,000 mPa·s (e.g., 2% w/v methylcellulose in water) in 1000 mL beakers using a 25 mm PTFE stir bar. Performance decreases predictably above this threshold due to drag torque limits.
Is the timer active during motor operation?
No—the timer must be set prior to initiating rotation. Once the motor is running, timer adjustments are locked to prevent accidental changes during critical processes.
Can the unit be mounted on a fume hood shelf?
Yes, provided the mounting surface is level, vibration-isolated, and supports ≥3 kg static load. Avoid locations directly above active exhaust ducts where airflow may destabilize stir bar rotation.
What maintenance is required?
Routine inspection of stir bar integrity and cleaning of the stainless steel surface with 70% ethanol or mild detergent. No lubrication or internal servicing is specified by the manufacturer; the sealed motor requires no periodic maintenance under normal use conditions.