Cole-Parmer Multi-Position Magnetic Stirrer with Heating Plate, Model 51450-26

Overview

The Cole-Parmer Multi-Position Magnetic Stirrer with Heating Plate (Model 51450-26) is an engineered solution for laboratories requiring simultaneous, independent control of stirring and thermal regulation across multiple samples. Designed around the principle of magnetic coupling—where a rotating permanent magnet beneath the ceramic plate induces rotation in a PTFE-coated stir bar immersed in the sample—the system delivers precise, contactless agitation without mechanical wear or contamination risk. Integrated resistive heating elements embedded beneath the chemically inert ceramic surface enable uniform, stable temperature distribution across all five positions. This dual-function architecture supports reproducible reaction kinetics, dissolution testing, buffer equilibration, and reagent preparation under controlled thermal and hydrodynamic conditions—critical for QC/QA workflows compliant with ISO/IEC 17025, USP , and GLP environments.

Key Features

• Five independently controllable stirring positions—each with dedicated speed and temperature setpoints, eliminating cross-talk between adjacent vessels.
• Ceramic top plate (31 × 31 cm) offering high corrosion resistance, thermal stability up to 500 °C surface temperature, and easy decontamination via wipe-down protocols.
• Adjustable speed range of 100–1500 rpm with closed-loop feedback for consistent torque delivery—even under variable viscosity or load conditions.
• Independent heating mode, stirring-only mode, or synchronized heating + stirring operation—configurable per position via front-panel digital interface.
• Robust 1410 W power rating ensures rapid thermal ramp rates and maintenance of setpoint temperatures under sustained 800 mL loads per position.
• Compact footprint (30.5 × 11.4 × 44.5 cm) optimized for benchtop integration in analytical, pharmaceutical, and academic labs with space constraints.

Sample Compatibility & Compliance

The 51450-26 accommodates standard laboratory glassware including beakers (50–800 mL), Erlenmeyer flasks, and cylindrical reaction vessels. Stir bar compatibility spans diameters from 10 mm to 40 mm, supporting both low-shear (e.g., PTFE-coated oval bars) and high-torque (e.g., cross-shaped or fleur-de-lis geometry) configurations. The device meets IEC 61010-1 safety standards for electrical equipment used in laboratory environments and complies with RoHS directives. Its ceramic surface and sealed electronics architecture support use in fume hoods and humidified incubator rooms. While not intrinsically rated for hazardous area classification, it is routinely deployed in non-explosive zones under SOPs aligned with OSHA Lab Standard 29 CFR 1910.1450.

Software & Data Management

This unit operates as a standalone analog/digital hybrid instrument with no embedded software or data logging capability. All operational parameters—including speed (rpm), setpoint temperature (°C), and active mode—are displayed on a dual LED readout and retained during power cycling. For traceability in regulated settings, users may integrate external USB data loggers (e.g., Omega OM-DAQPRO-5300) via optional analog output ports (0–5 V DC proportional to speed and temperature). Audit trails, electronic signatures, and 21 CFR Part 11 compliance require pairing with validated LIMS or ELN platforms—common practice in pharmaceutical manufacturing where this model serves as ancillary equipment in dissolution apparatus prep stations.

Applications

• Simultaneous pH adjustment and temperature stabilization of multi-batch calibration standards in clinical chemistry labs.
• Controlled solubilization of polymer blends during formulation development, where differential heating/stirring profiles mimic process-scale conditions.
• High-throughput buffer exchange in protein purification workflows—enabling parallel dialysis or desalting across five columns.
• Accelerated stability testing of liquid dosage forms under ICH Q1A-recommended temperature-humidity matrices.
• Preparation of homogeneous nanoparticle suspensions prior to DLS or TEM analysis, minimizing aggregation through reproducible shear history.

FAQ

Can this unit operate without heating while maintaining independent stirring control?
Yes—each position can be configured exclusively for stirring, heating, or both, using dedicated front-panel controls.
Is the ceramic plate resistant to strong acids such as concentrated HNO₃ or HF?
The alumina-based ceramic exhibits excellent resistance to most mineral acids except hydrofluoric acid (HF), which requires specialized handling protocols and is not recommended for direct contact.
What stir bar length is optimal for 800 mL beakers at 1500 rpm?
A 30–40 mm PTFE-coated stir bar with a fleur-de-lis geometry provides optimal vortex formation and torque transfer at maximum speed and volume.
Does the unit include overtemperature or dry-run protection?
Yes—integrated thermal cutoffs deactivate heating elements if surface temperature exceeds 550 °C or if no thermal load is detected for >90 seconds.
Are replacement ceramic plates available as spare parts?
Yes—Cole-Parmer part number EW-51450-76-PLATE is a field-replaceable ceramic top assembly compatible with all 5-position models in the 51450 series.