CZGY JB-2 Programmable Bidirectional Magnetic Stirrer

Overview

The CZGY JB-2 Programmable Bidirectional Magnetic Stirrer is an electromechanically integrated laboratory instrument engineered for precise, reproducible mixing of liquid samples under controlled thermal conditions. It operates on the principle of rotating magnetic coupling—where a microprocessor-regulated rotating magnetic field beneath a chemically inert ceramic-coated aluminum plate induces synchronous rotation of a PTFE- or glass-coated magnetic stir bar immersed in the sample vessel. Unlike unidirectional stirrers, the JB-2 incorporates a programmable polarity-switching circuit that alternates rotational direction at user-defined intervals, enhancing homogenization efficiency in viscous, heterogeneous, or sediment-prone solutions. Its dual-function architecture integrates independent control of stirring kinetics (speed and direction) and conductive heating (via embedded resistive coil), enabling simultaneous agitation and temperature stabilization without external hotplates. Designed for routine benchtop use in analytical, quality control, and preparative workflows, the JB-2 complies with fundamental electrical safety requirements per IEC 61010-1 for laboratory equipment and supports GLP-aligned documentation through manual timer logging.

Key Features

• Bidirectional stirring mode with automatic polarity reversal—reduces vortex asymmetry and improves suspension uniformity in colloidal, particulate, or polymer solutions
• Stepless speed regulation from 0 to 1600 rpm via analog potentiometer, ensuring smooth acceleration and avoidance of stir-bar slippage
• Integrated digital timer with 0–120 minute range and continuous (“ON”) setting—supports unattended operation while minimizing thermal drift during extended protocols
• Heating plate with ambient-to-100 °C range and ±2 °C stability at 60 °C (typical), calibrated against traceable NIST-traceable reference thermometers
• 15 cm diameter ceramic-coated aluminum work surface—resistant to acid, alkali, and organic solvent exposure; compatible with standard borosilicate glassware up to 3 L capacity
• Low-noise brushless motor (25 W) and separate 150 W heating circuit—enables independent activation of stirring and heating functions per SOP requirements
• Grounded chassis design with molded ABS housing—meets Class I protection requirements per IEC 61010-1 for operator safety in wet-lab environments

Sample Compatibility & Compliance

The JB-2 accommodates a broad range of sample containers—including beakers, Erlenmeyer flasks, and crystallizing dishes—up to 3000 mL volume, provided magnetic stir bars (included: two PTFE-coated rods) are appropriately sized (typically 20–40 mm length). It is suitable for aqueous buffers, saline solutions, dilute acids/bases, and low-viscosity organic solvents (e.g., ethanol, acetone, ethyl acetate). Not recommended for highly corrosive media (e.g., concentrated HNO₃, HF) or high-viscosity fluids (>500 mPa·s) without empirical validation. The unit conforms to electromagnetic compatibility (EMC) limits per CISPR 11 Group 1, Class B, and carries CE marking for the European Economic Area. While not certified to FDA 21 CFR Part 11, its manual timer output and physical controls support audit-ready recordkeeping when used within documented laboratory procedures adhering to ISO/IEC 17025 or USP guidelines.

Software & Data Management

The JB-2 is a standalone hardware device with no embedded firmware, network interface, or proprietary software. All operational parameters—speed, direction mode, timer setting, and heating status—are configured via front-panel mechanical controls and visually indicated by LED status lights. No data logging, remote access, or electronic audit trail is provided. Users are expected to manually record operating conditions (e.g., start time, set temperature, duration) in bound lab notebooks or LIMS-integrated electronic records. This architecture ensures deterministic behavior, eliminates cybersecurity vulnerabilities, and simplifies validation for regulated environments where deterministic, non-programmable instruments are preferred for basic mixing tasks.

Applications

• Buffer and reagent preparation in molecular biology and clinical diagnostics laboratories
• Solubility testing and dissolution profiling in pharmaceutical development (aligned with USP preliminary agitation steps)
• pH adjustment and titrant equilibration prior to potentiometric measurement
• Homogenization of calibration standards for spectrophotometry and ICP-OES analysis
• Pre-incubation mixing in ELISA and immunoassay protocol workflows
• Controlled heating/stirring during synthesis of metal-organic frameworks (MOFs) and nanoparticle precursors
• Environmental water sample conditioning prior to filtration or extraction

FAQ

Can the JB-2 be used for closed-vessel reactions under reflux?
Yes—provided the vessel has adequate headspace and the condenser is properly aligned; however, heating above 80 °C for prolonged periods may accelerate thermal aging of the plate coating.
Is the timer function repeatable across power cycles?
No—the timer resets upon power interruption; it does not retain settings or maintain real-time clock functionality.
What maintenance is required for long-term reliability?
Wipe the plate surface with isopropyl alcohol after each use; inspect stir bars for coating integrity quarterly; verify ground continuity annually using a calibrated earth bond tester.
Does the unit support external temperature probe feedback control?
No—it uses fixed-resistance heating without PID regulation or sensor input; temperature uniformity relies on thermal mass and conduction characteristics of the vessel bottom.
Are replacement stir bars available in custom geometries?
CZGY offers standard PTFE-coated oval and cross-shaped stir bars; custom dimensions require OEM quotation and minimum order quantities.