ShoLyn ShoHMS Smart Magnetic Stirrer with Heating

Overview

The ShoLyn ShoHMS Smart Magnetic Stirrer with Heating is a precision-engineered laboratory instrument designed for simultaneous temperature-controlled mixing of low-to-medium viscosity liquids. It operates on the principle of magnetic coupling: a rotating permanent magnet beneath the heated ceramic-coated aluminum plate induces rotational motion in a PTFE- or glass-coated stir bar immersed in the sample vessel. This contactless drive mechanism eliminates mechanical shaft seals and ensures contamination-free operation—critical for sensitive chemical synthesis, catalytic studies, and biological buffer preparation. Unlike basic hotplate stirrers, the ShoHMS Smart integrates closed-loop PID temperature regulation with real-time power modulation, enabling stable thermal control across its full 340 °C surface range while maintaining ±0.2 °C stability in representative aqueous loads (500 mL, 600 rpm). Its architecture meets functional requirements for GLP-compliant workflows where traceable temperature history, repeatable heating profiles, and operational safety are mandatory.

Key Features

• Intelligent PID temperature control algorithm with dynamic power adjustment to minimize overshoot and sustain ±1 °C plate stability and ±0.2 °C sample stability under load
• Ceramic-coated anodized aluminum heating plate (Φ135 mm) offering high thermal conductivity, chemical resistance to acids, bases, and organic solvents, and abrasion resilience
• Full-metal enclosure with corrosion-resistant epoxy-polyester coating, rated IP42 for protection against splashes and particulate ingress
• High-torque dual-polarity magnetic drive system supporting continuous or programmable forward/reverse stirring up to 20 L (H₂O equivalent), including intermittent cycling modes
• LCD interface with independent timer and countdown functions—enabling precise reaction duration control with separate termination logic for heating and stirring outputs
• Post-power-down thermal monitoring: real-time display of residual plate temperature; persistent alert if surface exceeds 50 °C after shutdown
• Configurable safety cutoff (28–370 °C) compliant with DIN 12878 requirements for laboratory hotplates
• Optional PT1000 external temperature probe input for direct sample temperature feedback and advanced control strategies
• RS485 serial interface (optional) for integration into centralized lab automation systems or LIMS environments requiring audit-trail-capable device communication

Sample Compatibility & Compliance

The ShoHMS Smart accommodates standard borosilicate glass vessels (beakers, flasks, reaction vials) from 10 mL to 20 L capacity, provided appropriate stir bar geometry and magnetic coupling distance are maintained. It is compatible with common laboratory solvents—including acetone, ethanol, DMF, DMSO, dilute mineral acids, and alkaline buffers—due to its chemically inert plate coating and sealed electronics housing. The unit conforms to IEC 61010-1:2010 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use) and incorporates design elements aligned with DIN 12878 (Laboratory Hotplates – Requirements and Test Methods). While not inherently 21 CFR Part 11–compliant as a standalone device, its optional RS485 interface supports integration with validated software platforms capable of electronic signature, audit trail, and data integrity management per FDA and EU Annex 11 expectations.

Software & Data Management

The ShoHMS Smart operates via embedded firmware with no proprietary PC software dependency. All configuration—including setpoints, timers, safety limits, and direction sequences—is managed directly through the front-panel LCD interface. For laboratories requiring traceability, the optional RS485 interface enables bidirectional communication using Modbus RTU protocol. This allows third-party SCADA or ELN systems to log setpoint changes, runtime events, temperature readings (from internal sensor or external PT1000), and fault conditions. When deployed in regulated environments, users may configure external logging servers to capture timestamped parameter histories—supporting retrospective review during internal audits or regulatory inspections. Firmware updates are performed via physical service port only, ensuring integrity and preventing unauthorized modification.

Applications

• Thermally driven organic synthesis (e.g., esterification, condensation, nucleophilic substitution) requiring precise temperature ramping and homogeneous mixing
• Preparation of homogeneous polymer solutions, nanoparticle dispersions, and colloidal suspensions prior to characterization
• Cell culture media warming and pH-buffer equilibration under controlled thermal conditions
• Accelerated stability testing of pharmaceutical formulations in temperature-stressed dissolution studies
• Parallel reaction screening when coupled with ShoLyn’s modular multi-position adapters or aluminum bead sand bath kits
• Hybrid photochemical setups—when integrated with ShoPhoS or ShoPhoM light sources—to enable sequential or concurrent thermal/photo activation pathways

FAQ

What is the maximum recommended vessel height for optimal magnetic coupling?
For reliable stir bar engagement at full speed (2000 rpm), vessel depth should not exceed 120 mm when using standard cylindrical beakers. Taller vessels require larger-diameter or cross-shaped stir bars.
Can the external PT1000 probe replace the built-in plate sensor for temperature control?
Yes—the system supports dual-sensor mode: the plate sensor governs heating power, while the PT1000 provides real-time sample temperature feedback for alarm triggering or manual override verification.
Is the RS485 interface enabled by default?
No—RS485 functionality requires factory configuration and installation of the optional communication module. Contact ShoLyn Technical Support for ordering and setup guidance.
Does the timer function retain settings after power loss?
No—the internal timer is volatile and resets upon interruption of main power. For mission-critical timed protocols, integrate with an uninterruptible power supply (UPS) or external controller.
How often should the ceramic coating be inspected for wear?
Visual inspection is recommended before each high-temperature (>250 °C) use. Minor scratches do not impair performance; however, exposed aluminum substrate or chipping warrants replacement of the plate assembly to maintain corrosion resistance and thermal uniformity.