Leici JB-43 Advanced Magnetic Stirrer
| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Domestic |
| Model | JB-43 |
| Instrument Type | Magnetic Stirrer |
| Maximum Stirring Volume | 20 L |
| Speed Range | 100–2000 rpm |
| Speed Display Accuracy | ±10 rpm |
| Speed Stability | ±10 rpm over 4 h |
| Timer Range | 0 min – 99 h 59 min |
| Timer Accuracy | ±1 min/h |
| Stir Bar Compatibility | Φ5×20 mm, Φ7×30 mm, Φ10×60 mm |
| Heating Function | None |
| Work Surface Material | Ceramic |
| Work Surface Dimensions | 180 × 180 mm |
| Housing Material | Metal |
| Operating Environment | 0–40 °C, ≤85% RH |
| Power Supply | AC 220 ± 22 V, 50 ± 1.0 Hz |
| Dimensions (W×D×H) | 235 × 393 × 140 mm |
| Weight | ~6.0 kg |
Overview
The Leici JB-43 Advanced Magnetic Stirrer is a precision-engineered laboratory instrument designed for consistent, controllable, and reproducible mixing of liquid samples across analytical, electrochemical, titration, and general chemistry workflows. Utilizing permanent magnet coupling and optimized motor control architecture, the JB-43 generates uniform rotational torque to drive magnetic stir bars within vessels—enabling efficient mass transfer without mechanical shaft penetration or seal degradation. Its non-contact stirring mechanism ensures contamination-free operation, making it especially suitable for sterile preparations, pH monitoring, redox titrations, and long-duration kinetic studies where sample integrity and operator safety are paramount.
Key Features
- Full-color capacitive touchscreen interface with real-time RPM display and intuitive icon-based navigation
- Adjustable speed control across a wide dynamic range (100–2000 rpm), calibrated to ±10 rpm accuracy and stabilized to ±10 rpm over 4-hour continuous operation
- Multi-mode rotation control: forward, reverse, and programmable alternating direction sequences to prevent vortex asymmetry or sediment accumulation
- Auto-start function with last-set speed memory—retains user-defined parameters after power cycle or shutdown
- Ceramic-coated 180 × 180 mm work surface offering high thermal stability, chemical resistance, and scratch resilience under repeated use
- Integrated triple-electrode mounting bracket compatible with standard glass-bodied reference, indicator, and counter electrodes—optimized for potentiometric titrations, cyclic voltammetry, and conductometric assays
- Robust metal chassis with vibration-dampened base design minimizes operational noise and lateral displacement during high-speed agitation
Sample Compatibility & Compliance
The JB-43 supports volumetric mixing up to 20 L in standard borosilicate glass or stainless-steel containers. It accommodates a broad spectrum of commercially available stir bars—including Φ5 × 20 mm (micro-volume), Φ7 × 30 mm (general-purpose), and Φ10 × 60 mm (high-viscosity or large-batch applications)—ensuring stable rotational coupling across viscosity ranges from water-like to moderately viscous aqueous polymer solutions (< 500 mPa·s). The device complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets electromagnetic compatibility requirements per EN 61326-1:2013. While not a regulated medical device, its design aligns with GLP documentation practices for instrument qualification (IQ/OQ) and supports traceable parameter logging when integrated with external data acquisition systems.
Software & Data Management
The JB-43 operates as a standalone instrument with embedded firmware; no proprietary software installation is required. All operational parameters—including speed setpoint, direction mode, timer duration, and elapsed time—are retained in non-volatile memory and displayed continuously on the LCD. For laboratories implementing electronic record-keeping under FDA 21 CFR Part 11 or ISO/IEC 17025, the unit may be paired with third-party Lab Information Management Systems (LIMS) via RS-232 or USB-to-serial adapters (optional accessory). Audit trails, user access logs, and configuration change history must be maintained externally, as the JB-43 does not feature built-in user authentication or digital signature capability.
Applications
- Endpoint detection in automated acid-base and redox titrations using dual-electrode configurations
- Homogenization of calibration standards and reference material suspensions prior to ICP-OES or AAS analysis
- Controlled reagent addition during electrochemical synthesis under inert atmosphere gloveboxes
- Stirring of buffer solutions during pH calibration and electrode validation protocols
- Preparation of homogeneous colloidal dispersions for UV-Vis spectroscopy or dynamic light scattering (DLS) sample loading
- Long-term stability testing of pharmaceutical formulations under ambient temperature conditions
FAQ
Does the JB-43 include a heating function?
No—the JB-43 is a magnetic stirrer only and does not incorporate a hotplate or temperature control module.
Can the JB-43 be used with non-aqueous solvents such as acetone or chloroform?
Yes, provided the stir bar coating (e.g., PTFE or glass-coated) is chemically compatible and the vessel is rated for the solvent; avoid prolonged exposure of ceramic surface to hydrofluoric acid or molten alkalis.
Is the electrode holder adjustable in height or angle?
The triple-electrode bracket is fixed-position but features standardized 6-mm diameter clamping sleeves compliant with DIN 19265 and ASTM D1141 specifications.
What maintenance is required for long-term reliability?
Routine cleaning of the ceramic surface with isopropyl alcohol and periodic inspection of stir bar integrity; no lubrication or internal calibration is user-serviceable.
How is speed accuracy verified during instrument qualification?
Speed verification should be performed using a certified optical tachometer traceable to NIST standards, measuring actual stir bar rotation under loaded conditions at multiple setpoints across the 100–2000 rpm range.
