GLTlab SHA-1R-A 6-inch Analog Signal Heating Magnetic Stirrer

Overview

The GLTlab SHA-1R-A is a 6-inch (152 mm) analog signal-controlled heating magnetic stirrer engineered for stable thermal and rotational performance in routine laboratory environments. It operates on the principle of magnetic coupling—where a rotating permanent magnet beneath the heated plate induces synchronous rotation of a PTFE- or glass-coated magnetic stir bar immersed in the sample vessel. Heat is delivered via resistive elements embedded in a ceramic-coated aluminum plate, offering uniform surface temperature distribution and resistance to chemical corrosion and thermal shock. Unlike digitally controlled units, the SHA-1R-A accepts continuous analog voltage signals (e.g., 0–10 V DC or 4–20 mA) from external process controllers, PLCs, or data acquisition systems—making it suitable for integration into automated reaction monitoring or multi-instrument control loops. Its negative-feedback heating architecture continuously compares real-time plate temperature (measured by an integrated PT1000 sensor interface) against the setpoint, dynamically modulating power delivery to minimize overshoot and drift—ensuring reproducible thermal conditions across extended operation.

Key Features

• 6-inch (152 mm) ceramic-coated aluminum heating plate with high thermal conductivity and abrasion resistance
• Analog signal input compatibility (0–10 V DC or 4–20 mA) for seamless integration with industrial control systems
• PID temperature regulation with external PT1000 probe support for precise, closed-loop thermal control
• Speed range of 150–1500 rpm with consistent torque output up to 10 L volume (water-equivalent)
• Maximum operating temperature of 350 °C—suitable for solvent reflux, polymerization initiation, and high-boiling-point media
• 600 W heating capacity enabling rapid thermal ramping and steady-state maintenance under load
• Negative-feedback heating circuitry minimizes thermal inertia effects and improves long-term stability
• Optional mechanical timer module for unattended batch processing (sold separately)

Sample Compatibility & Compliance

The SHA-1R-A accommodates standard laboratory glassware including beakers (up to 10 L), Erlenmeyer flasks, and jacketed reactors—provided magnetic stir bars of appropriate size and coating (e.g., PTFE, glass, or PEEK) are selected for chemical compatibility. The ceramic-coated surface resists attack from common solvents (e.g., acetone, ethanol, dilute acids/bases) and avoids contamination risks associated with bare metal plates. While not certified to IEC 61010-1 for hazardous area use, the unit complies with general laboratory safety requirements for Class I, Division 1 electrical equipment under ambient conditions. Its analog interface supports traceability when paired with validated control systems meeting GLP/GMP documentation standards—particularly where temperature and agitation parameters must be logged per FDA 21 CFR Part 11 requirements (when used with compliant DAQ software and audit-trail-enabled hardware).

Software & Data Management

As a standalone analog-input device, the SHA-1R-A does not include embedded firmware or onboard display logic. Instead, it functions as a field device within larger instrumentation ecosystems. When connected to programmable logic controllers (PLCs), SCADA systems, or PC-based data loggers (e.g., LabVIEW, MATLAB Data Acquisition Toolbox), users can record real-time speed setpoints, actual plate temperature, and heater duty cycle. The PT1000 sensor port enables direct temperature feedback logging, supporting calibration verification and uncertainty analysis per ISO/IEC 17025 guidelines. No proprietary drivers or cloud services are required; interoperability relies solely on standard analog I/O protocols and signal conditioning practices common in QC/QA and pilot-scale synthesis labs.

Applications

• Controlled heating and mixing during organic synthesis, catalyst activation, and crystallization studies
• Preparation of homogeneous polymer solutions and colloidal dispersions requiring sustained shear and thermal input
• Standardized dissolution testing in pharmaceutical QA workflows (aligned with USP agitation profiles when coupled with calibrated vessels)
• Environmental sample digestion (e.g., EPA Method 3050B) where precise ramp-and-hold thermal sequences are applied
• Calibration and validation of temperature probes and stir bar efficiency across viscosity gradients
• Teaching laboratories emphasizing foundational principles of heat transfer, fluid dynamics, and analog process control

FAQ

Does the SHA-1R-A support digital communication protocols such as RS-232 or Modbus?
No—it is strictly an analog-input device with no digital interface. Communication is limited to voltage or current signal inputs and passive temperature feedback via PT1000.
Can the unit maintain ±1 °C temperature accuracy across its full 35–350 °C range?
Accuracy depends on external probe placement, thermal mass of the vessel, and ambient draft conditions. With proper PT1000 immersion and PID tuning, typical stability is ±2–3 °C at steady state above 100 °C.
Is the ceramic coating resistant to hydrofluoric acid or molten alkali metals?
No—the coating is designed for general lab chemicals and does not withstand HF, hot concentrated NaOH/KOH, or reactive metals. Consult material compatibility charts before use.
What stir bar length is recommended for optimal coupling at 1500 rpm in a 5 L beaker?
A 60–80 mm PTFE-coated stir bar with dual internal magnets provides reliable coupling and vortex control under those conditions.
Can the optional timer be retrofitted to an existing SHA-1R-A unit?
Yes—the timer module connects via a dedicated front-panel socket and requires no internal modification. Installation is performed by qualified technical personnel following the service manual.