OHAUS Guardian 5000™ e-G51HP07C Magnetic Stirrer with Heating

Overview

The OHAUS Guardian 5000™ e-G51HP07C Magnetic Stirrer with Integrated Heating Plate is an engineered solution for precise, reproducible mixing and temperature-controlled sample preparation in regulated laboratory environments. Utilizing a high-torque permanent magnet drive system coupled with a precision-heated ceramic or aluminum plate, the device operates on the principle of magnetic coupling—where a rotating internal magnet beneath the plate induces rotation of a stir bar immersed in the sample vessel. This non-contact method eliminates mechanical wear, ensures consistent torque delivery across viscosity ranges, and supports closed-vessel applications without contamination risk. Designed for routine use in academic research, quality control laboratories, pharmaceutical development, and industrial R&D, the unit complies with international safety and electromagnetic compatibility standards required for deployment in GLP- and GMP-aligned workflows.

Key Features

• High-Performance Drive System: A brushless DC motor delivers stable rotational output from 60 to 1600 rpm with ±1 rpm speed resolution. The integrated SmartRate™ algorithm enables programmable acceleration/deceleration profiles, minimizing vortex formation and ensuring homogeneous dispersion—even in viscous media up to 20 L volume.
• Dual-Layer Thermal Safety Architecture: The SmartHeat™ system employs two physically independent temperature sensors and logic circuits. One monitors plate surface temperature; the other verifies thermal gradient integrity. If either exceeds preconfigured thresholds—or if sensor disagreement exceeds tolerance—the heater shuts down immediately, satisfying IEC 61010-2-051 requirements for Class II laboratory equipment.
• Chemical-Resistant SmartHousing™ Enclosure: Constructed from reinforced polymer with a chemically inert, sloped front panel and tempered glass interface, the housing directs spills away from internal electronics. The IP21 ingress protection rating confirms resistance to vertically falling droplets and solid objects >12.5 mm, supporting safe operation in wet or reagent-intensive settings.
• Real-Time Parameter Monitoring: A backlit LCD displays simultaneous readings of actual speed, setpoint temperature, elapsed time, and active safety status icons. All values update at 0.5-second intervals with traceable timestamping, enabling audit-ready documentation when paired with optional data logging software.
• Calibration & Traceability Support: Users may perform single-point temperature calibration at up to five user-defined setpoints (e.g., 25°C, 50°C, 100°C, 200°C, 350°C) using an external reference probe. Calibration events are logged internally with date/time stamps, supporting ISO/IEC 17025 compliance for instrument qualification.

Sample Compatibility & Compliance

The e-G51HP07C accommodates standard laboratory glassware including beakers (50 mL–5000 mL), Erlenmeyer flasks, and jacketed reactors up to 20 L total volume. Its heating plate accepts both ceramic and aluminum inserts, each optimized for thermal uniformity (±3°C across 150 mm diameter) and rapid response (typical rise time: <15 min from ambient to 300°C). The unit meets UL 61010-1 and CAN/CSA C22.2 No. 61010-1 for electrical safety, as well as TÜV SÜD certification for conformity with IEC 61010-2-010 (mechanical hazards) and IEC 61010-2-051 (heating equipment). Electromagnetic emissions comply with FCC Part 15 Class A and ICES-003 Class A limits—ensuring coexistence with sensitive analytical instrumentation such as HPLC detectors or mass spectrometers.

Software & Data Management

While standalone operation requires no software, the embedded USB interface supports firmware upgrades and protocol programming via OHAUS LabLink™ desktop application (Windows/macOS). Users may define multi-step heating/stirring sequences—including ramp-hold-cool cycles—with time-stamped execution logs exportable as CSV. When deployed in networked labs, SmartLink™ enables integration into centralized instrument management platforms compliant with FDA 21 CFR Part 11 requirements, including electronic signatures, audit trails, and role-based access control. All calibration and operational events are stored in non-volatile memory with tamper-evident timestamps.

Applications

• Preparation of buffer solutions, culture media, and reagent stocks under controlled thermal conditions
• Accelerated dissolution testing per USP & Ph. Eur. guidelines
• Homogenization of polymer melts, nanoparticle suspensions, and emulsions prior to rheological or particle size analysis
• Heating-assisted extraction protocols in environmental and food safety testing
• Reaction monitoring setups where inert atmosphere and temperature stability are critical (e.g., Grignard synthesis, esterification)

FAQ

Does the e-G51HP07C support external temperature feedback control?
Yes—when used with an optional PT100 or thermistor probe connected via the rear analog input, the unit switches from plate-sensor mode to sample-temperature control with PID tuning.
Is the heating plate interchangeable between ceramic and aluminum variants?
Yes—both inserts mount identically and are field-replaceable without tools; aluminum offers faster thermal response, while ceramic provides superior chemical resistance.
Can the device be validated for GxP environments?
Yes—the combination of internal event logging, calibration traceability, dual-sensor safety architecture, and Part 11–compliant software options supports IQ/OQ/PQ documentation per ASTM E2500 and EU Annex 11 requirements.
What maintenance is required for long-term reliability?
No scheduled maintenance is needed; periodic cleaning of the plate surface and housing with isopropyl alcohol is recommended. The brushless motor has no serviceable parts and is rated for >20,000 hours MTBF.
How does SmartPresence™ enhance lab safety?
SmartPresence™ uses capacitive proximity sensing to detect operator absence for >90 seconds, automatically reducing speed and disabling heating—reducing energy consumption and mitigating unattended operation risks per ANSI Z535.4 hazard communication standards.