CZGY JJ-4Q Constant-Speed Four-Station Electric Stirrer

Overview

The CZGY JJ-4Q Constant-Speed Four-Station Electric Stirrer is an engineered solution for parallel, reproducible liquid mixing in research, quality control, and routine analytical laboratories. Based on brushless DC motor technology and dual-loop (speed + current) closed-loop control architecture, it delivers high-speed stability and low mechanical drift across all four independently operated stirring stations. Unlike variable-frequency AC-driven units, this system eliminates commutator wear, ensures silent operation (<45 dB(A) at 1 m), and maintains ±1 rpm speed accuracy across its full 40–1500 rpm range—critical for viscosity-sensitive protocols, suspension homogenization, and kinetic reaction studies. Designed without integrated heating or cooling, the JJ-4Q operates strictly at ambient temperature, making it suitable for applications where thermal neutrality is required—such as standard method compliance testing (e.g., ASTM D3924, ISO 787-18), reagent preparation, wastewater sample conditioning, and multi-batch titration support.

Key Features

• Four independent stirring stations with identical performance specifications—enabling simultaneous processing of up to four 5 L samples under identical shear conditions
• Brushless DC motors (4 × 100 W) with dual-loop feedback control for dynamic load compensation and consistent torque delivery across viscosity ranges
• Large backlit LCD interface displaying real-time speed, elapsed time, and remaining timer duration; supports intuitive parameter entry via membrane keypad
• Precision electronic timer (0–9999 minutes) with programmable start/stop logic, including optional forward-reverse-pause cycling sequences
• Height-adjustable vertical column with lockable positioning mechanism—accommodates vessels from 50 mL beakers to 5 L glass or stainless-steel containers
• Integrated fault detection system with audible and visual alerts for motor stall, overload, or controller communication loss
• Rugged aluminum alloy chassis with non-slip silicone feet and IP20-rated enclosure—optimized for benchtop stability in shared lab environments

Sample Compatibility & Compliance

The JJ-4Q accepts standard laboratory stir bars (up to 80 mm length) and accommodates common vessel geometries—including cylindrical beakers, Erlenmeyer flasks, and custom reactor vessels—via adjustable clamp assembly. Its 5 L maximum capacity per station aligns with EPA Method 1664B (oil & grease extraction), APHA Standard Methods 2540D (total suspended solids), and ISO 5667-3 (water sampling preservation). While not certified to IEC 61000-6-3 (EMC) or UL 61010-1 out-of-the-box, the unit is constructed to meet essential safety requirements for Class I, Division 1 laboratory equipment under normal operating conditions. It supports traceable operation within GLP-compliant labs when paired with external audit-log software and calibrated speed verification tools.

Software & Data Management

The JJ-4Q operates as a standalone instrument with no embedded firmware update capability or USB/RS-232 connectivity. However, its timer and speed settings are fully repeatable and manually recordable—facilitating integration into paper-based or LIMS-linked SOPs. For digital workflow alignment, users may employ third-party data loggers (e.g., Omega OM-DAQPRO-5300) connected to auxiliary analog outputs (if externally retrofitted) or document operational parameters using standardized lab notebooks compliant with 21 CFR Part 11 Annex 11 principles (e.g., dated, signed, version-controlled entries). Calibration certificates for speed verification can be generated using NIST-traceable tachometers (e.g., Extech 461923).

Applications

• Wastewater treatment lab analysis: Equalization tank simulation, coagulant/flocculant dosing trials, and sludge settling studies
• Pharmaceutical QC: Dissolution media conditioning, buffer preparation, and excipient dispersion prior to HPLC or UV-Vis analysis
• Environmental testing: Soil leaching experiments (TCLP, SPLP), sediment resuspension protocols, and standard solution homogenization
• Chemical synthesis support: Multi-vessel reagent aging, catalyst suspension maintenance, and pre-reaction mixture equilibration
• Educational laboratories: Demonstration of laminar vs. turbulent flow regimes, Reynolds number correlation exercises, and mass transfer coefficient estimation

FAQ

Does the JJ-4Q support temperature control?
No. This model is strictly a constant-speed stirring platform with no integrated heating or cooling elements. Temperature-sensitive applications require external environmental control (e.g., water baths or climate chambers).
Can the stirring direction be reversed during operation?
Yes—forward/reverse/pause sequencing is programmable via the timer interface, provided total cycle time equals the preset main duration.
What is the recommended maintenance interval?
Visual inspection and cleaning of the shaft coupling and clamp mechanism should occur after every 200 hours of cumulative operation; motor bearings are sealed for life and require no lubrication.
Is speed calibration traceable to national standards?
While the unit itself does not include factory calibration documentation, speed accuracy (±1 rpm) can be verified using ISO 16063-11–compliant handheld tachometers with NIST-traceable certification.
Are replacement stirrer rods and clamps available as spare parts?
Yes—CZGY supplies OEM-compatible vertical shaft assemblies (part #JJ4Q-SHAFT-AL), universal clamps (JJ4Q-CLAMP-U), and PTFE-coated stir bars in 40 mm, 60 mm, and 80 mm lengths.