DLAB MS-H-S 20L High-Temperature Heating Magnetic Stirrer

Overview

The DLAB MS-H-S 20L High-Temperature Heating Magnetic Stirrer is an engineered solution for demanding laboratory applications requiring simultaneous precise temperature control and robust mechanical agitation of large-volume samples. Based on the principle of magnetic coupling—where a rotating permanent magnet beneath a thermally stable ceramic-coated stainless steel plate induces rotation in a submerged magnetic stir bar—the MS-H-S delivers consistent torque transmission without mechanical shaft penetration, eliminating seal wear and contamination risks. Designed for continuous operation under elevated thermal loads, it supports temperature setpoints up to 340 °C, making it suitable for solvent reflux, polymer dissolution, catalyst activation, and high-boiling-point reaction monitoring. Its brushless DC motor ensures stable rotational output across the full 0–1500 rpm range, with minimal speed drift under variable load conditions—a critical requirement for reproducible kinetic studies and quality-controlled process development.

Key Features

• High-temperature ceramic-coated stainless steel heating plate (Ø135 mm) rated to 340 °C, resistant to chemical corrosion and thermal shock
• Independent safety circuit with automatic thermal cut-off at 350 °C, compliant with IEC 61000-4-2 and EN 61010-1 safety standards for laboratory equipment
• Brushless DC motor architecture delivering low-noise, maintenance-free operation with <±2% speed accuracy across the 100–1500 rpm operating window
• IP42-rated fully enclosed housing providing protection against solid objects >1 mm and vertically falling water droplets—enhancing operational reliability in shared lab environments
• Integrated analog-style dual-scale display for simultaneous visual readout of setpoint temperature and actual plate surface temperature
• Optimized magnetic drive system with high-coercivity neodymium magnets ensuring secure coupling with stir bars up to 80 mm in length, even at maximum speed and viscosity

Sample Compatibility & Compliance

The MS-H-S accommodates standard glass and stainless-steel vessels—including round-bottom flasks (up to 20 L), beakers, and jacketed reactors—when used with appropriately sized magnetic stir bars (recommended 40–80 mm). Its wide thermal range supports aqueous, organic, and molten-salt media, provided vessel materials are rated for sustained exposure to 340 °C. The device conforms to key international laboratory safety and electromagnetic compatibility directives: EN 61326-1 (EMC for measurement/control equipment), EN 61010-1 (safety requirements for electrical equipment), and RoHS 2011/65/EU. While not certified for use in explosion-proof or Class I Div 1 environments, its sealed construction and thermal fail-safes align with general GLP-compliant lab infrastructure requirements.

Software & Data Management

The MS-H-S operates as a standalone analog-controlled instrument without digital interface or data logging capability. All parameter adjustments—speed and temperature—are performed via calibrated rotary dials with tactile feedback and engraved reference markings. This design prioritizes operational simplicity, repeatability, and long-term stability over connectivity, minimizing firmware dependencies and cybersecurity exposure. For laboratories implementing electronic record-keeping per FDA 21 CFR Part 11 or ISO/IEC 17025, manual entry of setpoints and duration into validated lab notebooks or LIMS remains the recommended practice. Calibration verification (e.g., using NIST-traceable RTD probes and tachometers) should be conducted semiannually or per internal SOPs.

Applications

• Preparative synthesis requiring extended heating/stirring cycles (e.g., Grignard reagent formation, esterification, condensation polymerization)
• Material science workflows involving high-melting-point precursors (e.g., metal-organic frameworks, ceramic slurries, thermoplastic composites)
• Quality assurance testing of industrial lubricants and heat-transfer fluids under ASTM D2983 and ISO 3104 viscosity conditioning protocols
• Environmental sample digestion (EPA Method 3050B, 3051A) where closed-vessel microwave alternatives are unavailable
• Biotechnology buffer formulation and solubilization of hydrophobic excipients under controlled thermal profiles

FAQ

What is the maximum recommended viscosity for reliable stirring at 20 L volume?
For optimal performance, the MS-H-S is validated for Newtonian liquids with dynamic viscosities up to 10,000 mPa·s at 25 °C when using a 60 mm PTFE-coated stir bar; higher viscosities require reduced volume or lower speed settings.
Does the unit support external temperature probe input for PID-controlled bath feedback?
No—the MS-H-S uses only built-in plate-surface sensing; it does not feature an external probe port or programmable PID algorithm.
Is the ceramic coating resistant to HF or strong alkali solutions?
The ceramic layer provides excellent resistance to common acids and bases but is not rated for prolonged contact with hydrofluoric acid or >50% w/w sodium hydroxide above 100 °C.
Can the stirrer be operated continuously for 72+ hours?
Yes—under ambient conditions ≤35 °C and relative humidity ≤70%, the unit meets IEC 60068-2-2 thermal endurance requirements for unattended operation up to 168 hours.
What calibration documentation is supplied with the instrument?
Each unit ships with a factory-verified conformity statement referencing EN 61010-1 and EN 61326-1; full metrological calibration certificates are available upon request at additional cost.