DLAB MS-H280-S4 & MS-H280-S6 LCD Digital Heating Magnetic Stirrers (4-Channel and 6-Channel)

Overview

The DLAB MS-H280-S4 and MS-H280-S6 are precision-engineered multi-position digital heating magnetic stirrers designed for parallel sample processing in regulated and research-intensive laboratory environments. These instruments operate on the principle of magnetic coupling—rotating a magnetic stir bar immersed in a vessel via a rotating magnetic field generated beneath a thermally conductive ceramic-coated aluminum plate. Integrated PTC heating elements and PID-controlled thermal regulation enable stable, uniform heating across all positions, while brushless DC motors ensure low-noise, maintenance-free operation with high torque consistency over extended duty cycles. The dual-channel heating architecture (two independent heating zones per unit) supports simultaneous temperature and speed control across multiple vessels—making the MS-H280 series particularly suited for applications requiring reproducible thermal-mechanical conditioning, such as Kjeldahl digestion, Soxhlet extraction, parallel synthesis, and standardized dissolution testing.

Key Features

• Independent dual-zone heating system with real-time PID feedback control for precise thermal management across all stirring positions
• LCD display interface showing both set and actual values for speed (rpm) and plate temperature (°C) with 0.1 °C resolution
• Ceramic-coated aluminum hotplate offering excellent thermal conductivity, chemical resistance, and long-term surface integrity
• Brushless DC motor design delivering consistent torque output from 200 to 1500 rpm, with speed stability maintained within ±20 rpm
• Integrated overtemperature protection at 420 °C—hardware-limited safety cutoff independent of software control logic
• Optional external PT1000 temperature probe input (±0.2 °C accuracy) for direct solution-phase temperature monitoring and closed-loop control
• IP21-rated enclosure ensuring basic protection against vertically falling drips and solid objects larger than 12.5 mm
• Compliance-ready design supporting audit trails when used in conjunction with validated laboratory information management systems (LIMS)

Sample Compatibility & Compliance

The MS-H280-S4 and MS-H280-S6 accommodate standard laboratory glassware—including round-bottom flasks (up to 1 L each), beakers, and digestion tubes—within their designated 3 L per position capacity limit. Each unit supports magnetic stir bars up to 40 mm in length, enabling efficient mixing of viscous or particulate-laden media commonly encountered in environmental analysis (e.g., soil/sediment extracts), pharmaceutical formulation development, polymer solution rheology screening, and food/feed digestibility assays. From a regulatory standpoint, the instruments meet general electrical safety requirements per IEC 61010-1 and are routinely deployed in laboratories adhering to ISO/IEC 17025, USP , and AOAC Official Methods frameworks. While not inherently 21 CFR Part 11 compliant, the devices support traceable parameter logging when integrated into validated instrument control networks with electronic signature and audit trail capabilities.

Software & Data Management

These stand-alone units do not include embedded PC connectivity or proprietary software. However, analog outputs (0–10 V or 4–20 mA) for temperature and speed signals are available upon request for integration into centralized SCADA or PLC-based process monitoring systems. When paired with external data loggers or LIMS interfaces, users can record time-stamped operational parameters—including setpoints, actual readings, alarm events, and run duration—for GLP/GMP documentation purposes. The LCD interface retains last-used settings after power cycling, minimizing reconfiguration time between analytical batches without compromising data integrity.

Applications

• Kjeldahl nitrogen determination workflows requiring synchronized heating and agitation across multiple digestion vessels
• Soxhlet extraction protocols where uniform solvent reflux and temperature stability directly impact analyte recovery rates
• Parallel synthesis of catalysts, metal-organic frameworks (MOFs), or small-molecule libraries under controlled thermal conditions
• Standardized dissolution testing (e.g., USP Apparatus II) for solid oral dosage forms using multi-vessel setups
• Environmental sample preparation—including sludge dewatering optimization, wastewater nutrient removal studies, and sediment leaching experiments
• Quality control of polymers, resins, and adhesives during viscosity profiling and crosslinking kinetics assessment

FAQ

Can the MS-H280-S6 operate six vessels at different temperatures simultaneously?
No—the unit features two independent heating zones, allowing only two distinct temperature setpoints across its six positions (e.g., three vessels at 80 °C, three at 120 °C).
Is external temperature feedback mandatory for accurate solution temperature control?
Not mandatory, but strongly recommended for applications where thermal lag between plate and liquid phase exceeds acceptable limits (e.g., high-viscosity media or large-volume vessels). The PT1000 sensor enables direct liquid-phase control with ±0.2 °C accuracy.
What is the maximum permissible ambient humidity for continuous operation?
Relative humidity must not exceed 80 % non-condensing at operating temperatures between 5 °C and 40 °C.
Do these models support RS232 or USB communication for remote parameter adjustment?
No—these are standalone instruments without digital communication ports. Parameter adjustments are performed exclusively via front-panel controls.
Are replacement ceramic plates available as spare parts?
Yes—DLAB offers certified OEM replacement plates (P/N: MS-H280-PLATE-CERAMIC) compatible with both S4 and S6 configurations.