Lohand LH-ES20 Electromagnetic Stirrer

Overview

The Lohand LH-ES20 Electromagnetic Stirrer is a compact, low-voltage DC-powered laboratory device engineered for precise, consistent magnetic agitation of liquid samples in life science, biotechnology, and analytical chemistry workflows. Unlike traditional AC-powered stirrers reliant on mechanical motor rotation, the LH-ES20 employs a high-efficiency electromagnetic drive system that generates a rotating magnetic field to actuate standard PTFE-coated or ceramic magnetic stir bars. This principle—based on Faraday’s law of electromagnetic induction—ensures silent, brushless operation with no moving parts subject to wear, delivering long-term reliability and minimal thermal drift during extended incubation or reaction monitoring. Designed specifically for mobile and resource-constrained environments—including field labs, biosafety cabinets, cold rooms, and mobile diagnostic units—the LH-ES20 operates safely at low DC voltage, eliminating risks associated with mains-powered equipment in humid or conductive settings.

Key Features

• Stainless steel 304 housing: Provides corrosion resistance against common reagents (e.g., ethanol, diluted acids/bases, saline buffers) and supports routine decontamination using 70% isopropanol or UV-C irradiation—critical for GLP-compliant cell culture preparation and molecular biology workflows.
• Continuously variable speed control (0–1500 rpm): Achieved via precision PWM (pulse-width modulation) regulation, enabling fine-tuned adjustment for sensitive applications such as gentle suspension of primary neurons, homogenization of viscous lysates, or controlled dissolution testing per USP & Ph. Eur. guidelines.
• Low-voltage DC operation (12 V nominal): Compatible with certified portable power stations (e.g., Jackery, EcoFlow), automotive cigarette-lighter sockets, and laboratory-grade DC bench supplies—enabling uninterrupted operation during power outages or off-grid deployments without compromising speed stability.
• Compact footprint (125 × 125 × 65 mm) and lightweight design (≤0.8 kg): Optimized for space-limited environments including laminar flow hoods, anaerobic chambers, and multi-instrument workstations; includes non-slip silicone feet and recessed cable management for secure placement.
• No internal fan or mechanical commutator: Eliminates particulate generation and electromagnetic interference (EMI), making it suitable for use adjacent to sensitive detection instruments such as microplate readers, electrophysiology rigs, and real-time PCR systems.

Sample Compatibility & Compliance

The LH-ES20 accommodates standard cylindrical and oval magnetic stir bars (lengths 20–60 mm, diameters 6–10 mm) across volumes from 5 mL to 2 L in glass, polypropylene, or borosilicate vessels. Its electromagnetic field geometry ensures stable bar rotation even under moderate viscosity conditions (< 500 mPa·s at 25 °C), supporting protocols involving cell suspensions, agarose solutions, and protein dialysis buffers. The unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets RoHS Directive 2011/65/EU for hazardous substance restriction. While not certified for Class II biological safety cabinet integration per NSF/ANSI 49, its low-heat emission and absence of airflow disturbance permit safe use within ISO Class 5–7 cleanroom-adjacent workflows when positioned outside the laminar flow path.

Software & Data Management

As a standalone analog-controlled instrument, the LH-ES20 does not feature embedded firmware, USB connectivity, or digital data logging. Speed setting is adjusted manually via rotary potentiometer with tactile feedback and calibrated scale markings (0–1500 rpm, ±20 rpm repeatability). For traceable operation in regulated environments (e.g., ISO 17025-accredited labs), users may integrate external validation tools—such as handheld tachometers (e.g., Extech 461923) or high-speed video analysis—to document rotational stability over time. The device supports audit-ready documentation through standard lab notebook entries referencing batch-specific stir bar calibration certificates and environmental monitoring logs.

Applications

• Cell culture media equilibration and pH buffer mixing prior to sterile filtration
• Homogenization of tissue lysates in RIPA or QIAzol reagents for downstream RNA/DNA extraction
• Controlled agitation during ELISA plate coating and wash steps to reduce edge effects
• Reagent reconstitution and dilution in point-of-care diagnostic development
• Long-duration enzymatic reactions requiring constant, low-shear mixing (e.g., restriction digests, ligations)
• Field-deployable sample preparation for environmental microbiology (water, soil eluates)

FAQ

Is the LH-ES20 compatible with ferrofluid-based stirring systems?

No—it is designed exclusively for conventional permanent-magnet stir bars and does not generate sufficient field strength for ferrofluid actuation.
Can it be used inside a CO₂ incubator?

Yes, provided ambient temperature remains ≤40 °C and relative humidity is <80% RH; verify compatibility with incubator manufacturer due to potential EMI concerns with CO₂ sensor electronics.
Does it support timer-based automatic shutdown?

No—this is a manually operated analog device without programmable functions.
What stir bar sizes are recommended for optimal performance?

For volumes ≤100 mL: 30 mm × 7 mm oval bar; for 100–500 mL: 40 mm × 8 mm cylindrical bar; for >500 mL: 60 mm × 10 mm bar with optimized magnetic moment (≥1.8 A·m²).
Is CE marking applied to this model?

The LH-ES20 carries CE marking under the EMC Directive 2014/30/EU and Low Voltage Directive 2014/35/EU, with technical documentation available upon request for EU-based distributors.