Leici JB-12 Magnetic Stirrer

Overview

The Leici JB-12 Magnetic Stirrer is a compact, benchtop laboratory instrument engineered for reliable and consistent mixing of low-to-medium viscosity liquid samples in research, quality control, and teaching laboratories. It operates on the principle of magnetic coupling—where a rotating permanent magnet or electromagnetic array beneath the work surface induces synchronized rotation of a magnetic stir bar immersed in the sample vessel. This contactless drive mechanism eliminates mechanical wear, shaft seal leakage, and cross-contamination risks associated with overhead stirrers. Designed for routine use under ambient conditions, the JB-12 delivers stable rotational output across its full speed range (60–2000 rpm), enabling effective homogenization, dissolution, and suspension maintenance without introducing external vibration or thermal load to the sample platform.

Key Features

• Brushless electromagnetic drive system ensures zero mechanical wear, extended service life, and near-silent operation—ideal for noise-sensitive environments such as analytical labs and shared instrumentation suites.
• Dual-direction stirring capability (clockwise and counterclockwise) enhances mixing efficiency for heterogeneous systems, reducing vortex formation and promoting uniform dispersion—particularly beneficial when handling viscous buffers or particulate suspensions.
• IP65-rated enclosure provides robust protection against dust ingress and low-pressure water jets, supporting safe operation in wet lab environments, fume hoods, or near sink stations where incidental splashes may occur.
• Lightweight polycarbonate housing and PET-coated control panel offer high impact resistance, chemical resistance to common solvents (e.g., ethanol, dilute acids/bases), and long-term dimensional stability under repeated thermal cycling.
• Compact footprint (110 × 169 × 109 mm) enables flexible placement on crowded benchtops, inside laminar flow cabinets, or within temperature-controlled chambers—provided ambient operating conditions remain within 5–40 °C and relative humidity ≤80% RH (non-condensing).

Sample Compatibility & Compliance

The JB-12 is compatible with standard glassware including beakers (50–1000 mL), Erlenmeyer flasks, and cylindrical reaction vessels equipped with appropriately sized PTFE- or glass-coated magnetic stir bars. It is not intended for use with conductive or ferromagnetic containers (e.g., stainless steel beakers), nor for high-viscosity media exceeding 10,000 mPa·s at room temperature. While the device itself carries no CE, UL, or IEC certification markings, its electrical design conforms to GB 4793.1–2019 (equivalent to IEC 61010-1:2010) for safety requirements of electrical equipment for measurement, control, and laboratory use. Its IP65 rating aligns with IEC 60529, facilitating integration into GLP-compliant workflows where environmental resilience is documented.

Software & Data Management

The JB-12 operates as a standalone analog-controlled instrument with no embedded microprocessor, digital interface, or data logging capability. It lacks USB, RS-232, or Bluetooth connectivity and does not support remote operation or audit trail generation. As such, it is suitable for applications requiring simple, deterministic operation without regulatory traceability requirements (e.g., USP , FDA 21 CFR Part 11). For laboratories implementing electronic record systems, manual entry of operational parameters—including start time, duration, and selected speed—is recommended for batch documentation consistency.

Applications

• Preparation of standard solutions and calibration standards in analytical chemistry labs.
• Homogenization of biological reagents (e.g., agarose gels, cell culture media, antibody dilutions) prior to filtration or dispensing.
• Supporting titration workflows by maintaining uniform analyte distribution during endpoint detection.
• Facilitating solvent-based extractions and pH adjustment steps in environmental and pharmaceutical QC testing.
• Use in undergraduate teaching labs for demonstrating mass transfer kinetics, dissolution behavior, and fluid dynamics principles under controlled rotational input.

FAQ

Does the JB-12 support programmable speed ramping or preset protocols?
No. The unit features a single analog speed control knob with continuous adjustment between 60 and 2000 rpm; it does not store or recall speed profiles.
Can the JB-12 be used inside an incubator or cold room?
It is rated for operation between 5 °C and 40 °C. Prolonged use below 10 °C may affect torque delivery and panel responsiveness; condensation must be prevented per IP65 limitations.
Is the stirrer compatible with magnetic bars larger than 40 mm?
Yes—maximum effective stir bar length is ~60 mm for optimal coupling efficiency at higher speeds; however, stability decreases above 2000 rpm with oversized bars.
Does the device include overload or thermal shutdown protection?
No. The JB-12 relies on passive thermal dissipation and has no active fault detection circuitry; continuous operation beyond 8 hours at maximum speed is not recommended.
What maintenance is required for long-term reliability?
Periodic cleaning of the top plate with isopropyl alcohol and inspection of the stir bar for coating integrity are sufficient; no lubrication or calibration is necessary.