Thermo Scientific RT2 Basic Hotplate Stirrer

Overview

The Thermo Scientific RT2 Basic Hotplate Stirrer is a robust, entry-level magnetic stirring and heating platform engineered for routine laboratory applications requiring precise thermal control and reliable mechanical agitation. Designed around the Couette flow principle—where rotation of a magnetic stir bar induces laminar fluid motion—the RT2 delivers consistent mixing performance across aqueous, organic, and viscous media. Its integrated ceramic-coated aluminum heating plate provides uniform thermal distribution and rapid response, while its dual-function architecture enables independent or simultaneous operation of heating and stirring. The device complies with IEC 61010-1 safety standards for laboratory electrical equipment and meets essential requirements for use in GLP-compliant environments where traceable temperature and speed settings are critical for method reproducibility.

Key Features

• Ceramic-coated aluminum heating plate (140 mm diameter) offering high thermal conductivity, chemical resistance, and long-term surface stability up to 450 °C maximum surface temperature
• Independent digital control of heating (RT + 50 °C to 350 °C) and stirring (50–2000 rpm), each with LED display and push-button interface
• Integrated over-temperature protection system that automatically deactivates heating and triggers a visual alarm when preset limits are exceeded
• Compact footprint and low-profile design optimized for benchtop integration in fume hoods, biosafety cabinets, or multi-instrument workstations
• Front-panel calibration access for temperature and speed verification—supporting internal adjustment per ISO/IEC 17025-aligned maintenance protocols
• Modular accessory compatibility including anti-slip water baths for enhanced thermal uniformity, transparent polycarbonate safety shields for splash and vapor containment, and vertical support rods for RTD or pH probe positioning

Sample Compatibility & Compliance

The RT2 Basic supports a broad range of sample containers—from standard glass beakers (50 mL to 20 L) to round-bottom flasks and crystallization dishes—provided they are compatible with magnetic stirring (i.e., non-ferromagnetic, bottom-flat geometry). It accommodates stir bars up to 80 mm in length and is validated for continuous operation with low-to-medium viscosity liquids (≤ 500 mPa·s). The unit conforms to CE marking requirements under the EU Low Voltage Directive (2014/35/EU) and Electromagnetic Compatibility Directive (2014/30/EU). While not FDA 21 CFR Part 11–enabled out-of-the-box, its manual control architecture ensures full auditability in regulated QC/QA workflows when paired with external loggers or LIMS-integrated environmental monitoring systems.

Software & Data Management

As a standalone analog-digital hybrid instrument, the RT2 Basic does not feature embedded software, USB connectivity, or remote control capabilities. All operational parameters are set and monitored locally via tactile push buttons and dual 3-digit LED displays. This design prioritizes reliability, electromagnetic noise immunity, and ease of validation in environments where networked instrumentation introduces cybersecurity or interference risks. For laboratories requiring electronic recordkeeping, optional external data loggers (e.g., Omega OM-DAQPRO-5300 series) can be interfaced via analog voltage outputs (0–5 V) from calibrated thermocouple or tachometer signal taps—enabling time-stamped capture of temperature and rotational speed aligned with 21 CFR Part 11 Annex 11 principles when implemented with appropriate procedural controls.

Applications

• Buffer and reagent preparation in molecular biology and clinical diagnostics labs
• Solubility testing and dissolution profiling in pharmaceutical development (aligned with USP and guidance)
• Catalyst activation and homogeneous reaction initiation in synthetic chemistry workflows
• Standardized sample conditioning prior to analysis by HPLC, ICP-MS, or titration systems
• Teaching laboratory demonstrations of heat transfer kinetics and fluid dynamics principles
• Pre-analytical sample homogenization in environmental testing (e.g., soil extractants, wastewater digestates)

FAQ

Is the RT2 Basic compatible with PTFE-coated stir bars?
Yes—standard PTFE- or PTFE/glass-coated stir bars are fully supported; avoid ferromagnetic or oversized bars exceeding 80 mm length to ensure stable vortex formation.
Can the unit maintain ±1 °C temperature accuracy across its full range?
At 100 °C, typical deviation is ±2.5 °C (per factory calibration report); accuracy decreases slightly at extremes—±5 °C at 350 °C. For tighter tolerances, external PID controllers or PT100 probes are recommended.
Does the RT2 Basic meet ISO 13485 requirements for medical device manufacturing?
While not certified, its construction, documentation package (including calibration certificate and test reports), and design traceability enable qualification per ISO 13485 clause 7.5.2.1 when incorporated into controlled processes.
What is the expected service life under continuous 8-hour daily operation?
Rated for ≥20,000 hours of heating element life and ≥50,000 cycles of stir motor actuation when operated within specified ambient conditions (15–30 °C, <80% RH, non-corrosive atmosphere).
Are replacement ceramic plates available as spare parts?
Yes—genuine Thermo Fisher part number 88892140 is available through authorized distributors with lead times averaging 2–4 weeks.