Leici JB-12 Magnetic Stirrer

Overview

The Leici JB-12 Magnetic Stirrer is a compact, robust benchtop instrument engineered for reliable and consistent sample agitation in general laboratory workflows. It operates on the principle of magnetic coupling—where a rotating permanent magnet or electromagnetic array beneath the work surface induces rotational motion in a magnetic stir bar immersed in the sample vessel. This contactless drive mechanism eliminates mechanical wear, shaft seal leakage, and contamination risks associated with overhead stirrers. Designed for routine mixing tasks in chemistry, biology, environmental analysis, and quality control labs, the JB-12 delivers stable rotational performance across its full speed range without requiring external temperature regulation or feedback control.

Key Features

• Brushless electromagnetic drive system ensures zero mechanical wear, extended service life, and ultra-low operational noise—ideal for shared lab environments and laminar flow hoods.
• Dual-direction rotation (clockwise and counterclockwise) enhances homogenization efficiency, particularly for viscous or heterogeneous suspensions where unidirectional stirring may induce vortex asymmetry or particle stratification.
• IP65-rated enclosure provides protection against low-pressure water jets and dust ingress, enabling safe operation in wet-lab settings, near sinks, or in humidified incubator rooms.
• Chemically resistant polycarbonate housing and PET front panel withstand incidental exposure to common solvents, acids, and bases—supporting long-term durability under standard laboratory handling conditions.
• Compact footprint (110 × 169 × 109 mm) optimizes space utilization on crowded workbenches while maintaining structural rigidity and vibration damping during high-speed operation.

Sample Compatibility & Compliance

The JB-12 is compatible with standard glass and plastic vessels—including beakers, flasks, and vials—up to 1 L capacity when used with appropriately sized stir bars (e.g., 20–40 mm PTFE-coated rods). Its open-loop speed control architecture meets functional requirements for non-critical mixing applications where precise speed reproducibility is secondary to operational simplicity and reliability. While not certified to ISO/IEC 17025 or GLP-specific calibration traceability standards, the device conforms to IEC 61000-6-3 (EMC emission limits) and IEC 61000-6-2 (immunity), and its IP65 rating aligns with IEC 60529 for ingress protection. No integrated temperature sensing or regulatory compliance for GMP or FDA 21 CFR Part 11 environments is provided.

Software & Data Management

The JB-12 operates as a standalone analog-controlled instrument with no embedded microprocessor, digital interface, or connectivity options. It does not support data logging, remote control, USB/Bluetooth communication, or software integration. All operational parameters—including speed selection—are adjusted manually via a calibrated rotary potentiometer. Consequently, it generates no electronic audit trail, lacks timestamped event records, and is not designed for environments requiring ALCOA+ data integrity principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available). Its simplicity makes it suitable for teaching labs, pilot-scale preparation, and non-regulated R&D workflows.

Applications

• Routine dissolution and reagent reconstitution in analytical sample preparation.
• Homogenization of buffer solutions, cell culture media, and dilution standards prior to pH or conductivity measurement.
• Supporting gravimetric analysis workflows by ensuring uniform suspension of precipitates during filtration or centrifugation steps.
• Pre-mixing of coating formulations, polymer solutions, and colloidal dispersions in materials science prototyping.
• Use in field-deployable or mobile laboratory units where power efficiency, shock resistance, and minimal maintenance are prioritized over programmability.

FAQ

Does the JB-12 support speed calibration or external verification?
No. The unit employs a fixed-gain analog speed controller without user-accessible calibration routines or factory-certified adjustment points.
Can it be used with metal containers or aluminum foil-covered vessels?
No. Magnetic coupling requires non-ferromagnetic, non-metallic vessel bottoms; stainless steel, aluminum, or ferrous substrates will impede or block magnetic transmission.
Is the JB-12 compatible with stir bars containing rare-earth magnets?
Yes—standard NdFeB or SmCo stir bars up to 40 mm in length perform reliably within the specified speed range, provided vessel geometry allows free rotation.
What safety certifications does the JB-12 carry?
It complies with CE marking requirements under the Low Voltage Directive (2014/35/EU) and EMC Directive (2014/30/EU); full test reports are available upon request from Leici’s technical documentation portal.
Does the IP65 rating apply to continuous submersion or chemical immersion?
No. IP65 denotes protection against water projected from a nozzle (6.3 mm diameter) at low pressure (30 kPa) from any direction—not immersion, steam sterilization, or prolonged solvent exposure.