Leici JB-13 Magnetic Stirrer

Overview

The Leici JB-13 Magnetic Stirrer is a compact, high-reliability benchtop laboratory instrument engineered for precise and reproducible mixing of low-to-medium viscosity liquid samples in research, quality control, and teaching laboratories. It operates on the principle of magnetic coupling: a rotating permanent magnet or electromagnetic drive beneath the non-magnetic work surface induces synchronous rotation of a magnetic stir bar immersed in the sample vessel. This contactless drive mechanism eliminates mechanical shaft seals and bearings—reducing wear, contamination risk, and maintenance requirements. Designed for continuous operation under ambient conditions, the JB-13 delivers stable rotational output across its full speed range without thermal drift or torque drop-off, making it suitable for applications requiring consistent agitation over extended durations—including dissolution testing, buffer preparation, reagent homogenization, and titration support.

Key Features

• Brushless electromagnetic drive system with zero mechanical wear—ensures long-term speed stability and silent operation at all setpoints.
• Backlit LCD display showing real-time rotational speed (rpm) with ±2 rpm repeatability under standard load conditions.
• Dual operational modes: unidirectional rotation for steady-state mixing and periodic rotation (alternating direction at user-defined intervals) to prevent vortex formation and improve suspension uniformity in heterogeneous systems.
• Independent clockwise/counterclockwise direction selection—enables optimization of mixing dynamics for specific vessel geometries or viscous sample behaviors.
• Intuitive push-button interface for fine-grained speed adjustment (±10 rpm increments), supporting rapid parameter iteration during method development.
• Programmable digital timer (1 min to 99 h 59 min) with auto-shutdown functionality—supports GLP-compliant unattended operation and repeatable protocol execution.
• IP65-rated enclosure—protects internal electronics against dust ingress and low-pressure water jets, permitting safe use near sinks, fume hoods, or humid environments.
• Chemically resistant polycarbonate housing and PET overlay panel—resistant to common solvents, acids, and bases encountered in routine lab workflows.

Sample Compatibility & Compliance

The JB-13 is compatible with standard glass and plastic containers up to 2 L volume when used with appropriately sized magnetic stir bars (e.g., 20–40 mm PTFE-coated rods). It maintains effective agitation in aqueous solutions, buffers, dilute organic solvents, and low-viscosity suspensions (≤500 mPa·s at 25 °C). While not intended for high-viscosity polymer melts or abrasive slurries, its torque profile supports reliable stirring of moderately dense precipitates during filtration prep or crystallization studies. The device complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets CE marking requirements for EMC (EN 61326-1) and low-voltage directives. Its sealed construction aligns with ISO/IEC 17025 recommendations for environmental robustness in accredited testing labs.

Software & Data Management

The JB-13 operates as a standalone hardware unit without embedded firmware-based data logging or PC connectivity. All operational parameters—including set speed, direction mode, timer value, and active status—are retained locally via non-volatile memory and persist through power cycles. No software installation, driver configuration, or network integration is required. For laboratories implementing electronic record-keeping under FDA 21 CFR Part 11 or EU Annex 11, users may document settings manually in lab notebooks or integrate the JB-13 into broader SOP-driven workflows where timing and speed are pre-specified and verified via external calibration logs. Routine verification can be performed using an optical tachometer traceable to NIST standards.

Applications

• Preparation of standardized calibration standards and reference solutions in analytical chemistry labs.
• Homogenization of cell culture media and buffer stocks prior to sterilization or dispensing.
• Supporting gravimetric analysis workflows by ensuring complete dissolution of solid analytes before filtration or titration.
• Facilitating kinetic studies where controlled, uninterrupted agitation is required over hours (e.g., hydrolysis rate measurements).
• Use in undergraduate teaching labs for demonstrating solution-phase reaction kinetics, solubility equilibria, and mass transfer principles.
• Integration into QC release testing protocols for pharmaceutical excipients where mixing consistency directly impacts assay precision.

FAQ

Does the JB-13 support external control via RS-232 or USB?
No. The JB-13 is a manually operated instrument without digital communication interfaces.
What is the maximum recommended container diameter for optimal stirring performance?
For uniform vortex-free mixing, use vessels ≤120 mm in diameter with a centrally placed stir bar.
Can the JB-13 be used with hot plates?
No. The JB-13 is a non-heating magnetic stirrer only. It does not incorporate heating elements or temperature control.
Is calibration certification available from the manufacturer?
Leici provides factory calibration verification reports upon request; users should perform periodic speed validation using an independent tachometer.
How often should maintenance be performed?
No scheduled maintenance is required. Wipe the surface with isopropyl alcohol after each use; inspect stir bars for coating integrity before reuse.