CZGY JJ-4A Constant-Speed Six-Station Electric Stirrer

Overview

The CZGY JJ-4A Constant-Speed Six-Station Electric Stirrer is an engineered solution for parallel, reproducible liquid mixing in analytical and process validation laboratories. Based on direct-coupled permanent magnet DC motor technology, it delivers stable rotational torque across a wide speed range (100–3000 rpm), enabling consistent shear application in low- to medium-viscosity aqueous and organic systems. Unlike variable-frequency or gear-driven stirrers, the JJ-4A employs electronic closed-loop speed regulation per station—ensuring minimal drift (<±2% of setpoint under load) without feedback sensors. Its six independent drive units are mechanically isolated to prevent cross-talk during simultaneous operation, making it especially suitable for comparative studies requiring identical or differentiated agitation protocols across multiple samples. The unit is routinely deployed in wastewater treatment labs for coagulation/flocculation testing (per ASTM D2035 and ISO 10523), environmental sample homogenization, reagent preparation, and QC batch mixing where inter-sample consistency is critical.

Key Features

• Six fully independent stirring stations with individual digital speed and timer controls—enabling both synchronous and asynchronous operation
• Permanent magnet DC motors (60 W each) with built-in torque boost circuitry for stable performance at low speeds (<300 rpm) and high-viscosity loads
• Stepless electronic speed regulation with dual LED display per station (rpm and remaining time)
• Adjustable vertical lift stand with precision height lock mechanism (range: 0–180 mm), compatible with standard Erlenmeyer flasks, beakers, and cylindrical sample vessels up to 20 L capacity per station
• Stainless steel stirring rods (316-grade) with standardized 10 mm shaft diameter and interchangeable paddle/propeller attachments (not included)
• Robust aluminum alloy chassis with thermal-overload protection and EMI-shielded power distribution board
• No integrated heating or temperature control—designed exclusively for mechanical agitation in ambient or externally temperature-controlled environments

Sample Compatibility & Compliance

The JJ-4A supports glass, polypropylene, and PTFE-lined containers ranging from 50 mL test tubes to 20 L carboys. Its mechanical design accommodates standard labware geometries—including round-bottom flasks, tall-form beakers, and narrow-neck digestion vessels—when paired with appropriate clamping accessories. Each station’s motor is rated for continuous duty at ≤85% of maximum speed under nominal load, meeting IEC 61000-6-3 EMC emission limits. While the device itself carries no CE or UL certification mark, its electrical architecture complies with basic safety requirements outlined in IEC 61010-1 for laboratory equipment. It is routinely validated for use in GLP-regulated settings where traceable, manual-operated agitation is required; audit trails rely on operator logbooks rather than embedded software, aligning with FDA 21 CFR Part 11 Annex A guidance for non-computerized systems.

Software & Data Management

The JJ-4A operates as a standalone hardware platform with no firmware, USB interface, or network connectivity. All operational parameters—including speed setpoints, timer values, and run status—are entered and monitored via tactile membrane buttons and dual-line LED displays. No data logging, export, or remote configuration capabilities are provided. This architecture eliminates cybersecurity risks and ensures deterministic behavior in regulated environments where software validation would otherwise be required. Users maintain full procedural control through documented SOPs, and calibration verification (e.g., tachometer cross-check) is performed manually at defined intervals per internal quality system requirements.

Applications

• Wastewater coagulant dosage optimization (jar testing per Standard Methods 20th ed., 2005, Method 2130B)
• Homogenization of suspended solids in environmental water samples prior to filtration or analysis
• Preparation of calibration standards and reference solutions in analytical chemistry workflows
• Accelerated stability testing of emulsions and colloidal dispersions under controlled agitation
• Parallel dissolution testing of pharmaceutical excipients in non-sink conditions
• Cell suspension maintenance in microbiology and bioprocessing pre-culture steps

FAQ

Is the JJ-4A compatible with corrosive solvents such as concentrated acids or halogenated organics?
Yes—the stainless steel (316) stirring rods and sealed motor housings provide resistance to common laboratory chemicals; however, prolonged exposure to hydrofluoric acid or hot chlorinated solvents is not recommended.
Can the six stations operate at different speeds simultaneously?
Yes—each station has independent speed and timer controls, allowing heterogeneous protocols without interference.
Does the unit include stirring rods or clamps?
It ships with six standard stainless steel stirring rods (300 mm length, 10 mm shaft); universal clamp sets and specialized impellers are available as optional accessories.
What maintenance is required for long-term reliability?
Annual inspection of motor brushes, cleaning of ventilation grilles, and verification of mechanical alignment using a dial indicator (recommended tolerance: ≤0.2 mm radial runout).
Is technical support available outside China?
CZGY provides remote troubleshooting documentation in English and collaborates with authorized regional distributors for field service; spare parts are shipped globally via DHL Express.