IKA RCT 5 digital Magnetic Stirrer

Overview

The IKA RCT 5 digital is a high-precision, dual-function magnetic stirrer and hotplate engineered for reproducible mixing and temperature-controlled sample preparation in research laboratories, quality control environments, and pharmaceutical development workflows. Utilizing robust Couette-type magnetic coupling and Peltier-free resistive heating, the instrument delivers stable rotational torque across its full speed range while maintaining tight thermal regulation on the ceramic-coated aluminum plate. Its integrated microprocessor architecture enables real-time monitoring of both rotational dynamics and thermal response—critical for applications requiring strict adherence to ASTM E2912 (standard practice for temperature calibration of hotplates) and ISO/IEC 17025-compliant method validation. Designed for unattended operation, the RCT 5 digital supports GLP/GMP-aligned workflows through audit-trail-capable parameter logging via RS232 or USB connectivity.

Key Features

• Dual LCD display showing simultaneous setpoint and actual values for both speed (rpm) and temperature (°C/°F)
• Reversible rotation mode with programmable direction switching—essential for preventing vortex collapse in viscous or heterogeneous media
• Intelligent viscosity trend detection algorithm that dynamically adjusts motor current feedback to infer relative changes in medium resistance
• Multi-stage safety architecture: overtemperature cut-off (adjustable 50–370 °C), dry-run detection (Error 5), and surface-overheat warning icon on hardened chemical-resistant glass display
• Ceramic-coated square heating plate (137 × 137 mm) offering superior scratch resistance and uniform heat distribution compared to standard enamel or stainless steel surfaces
• Extended timer functionality (1 second to 2399 hours) supporting complex multi-step protocols including staggered heating/stirring cycles
• External temperature control compatibility with PT1000, ETS-D5, and ETS-D6 probes—enabling closed-loop media temperature regulation with ±0.2 K accuracy under defined test conditions (e.g., 500 mL H₂O in 600 mL beaker, 40 mm stir bar, 600 rpm)

Sample Compatibility & Compliance

The RCT 5 digital accommodates standard laboratory vessels from 10 mL vials to 20 L carboys, provided magnetic coupling remains effective (stir bar length: 30–80 mm). Its heating plate design ensures compatibility with borosilicate glass, PTFE-lined containers, and most chemically resistant polymers. The unit complies with DIN EN 60529 (IP42 ingress protection), CE marking requirements, and electromagnetic compatibility standards per EN 61326-1. For regulated environments, its RS232/USB interfaces support 21 CFR Part 11-compliant data export when paired with validated third-party acquisition software. Temperature calibration traceability aligns with EURAMET cg-18 guidelines for hotplate thermometers, and stirring performance meets ISO 15197:2013 criteria for mechanical consistency in liquid-phase homogenization.

Software & Data Management

While the RCT 5 digital operates as a standalone instrument, its embedded communication protocols enable seamless integration into centralized lab informatics systems. Raw parameter logs—including timestamped speed, plate temperature, media temperature (when external probe is connected), timer status, and error flags—are exportable via ASCII-formatted serial dumps or USB mass storage mode. These logs retain metadata required for FDA audit readiness: operator ID (via optional external authentication), method name, batch identifier, and environmental context (ambient temperature/humidity). Firmware updates are performed via USB without proprietary drivers, ensuring long-term maintainability beyond vendor lifecycle constraints.

Applications

• Preparation of homogeneous buffer solutions and reagent stocks under controlled thermal conditions
• Accelerated dissolution testing in pharmaceutical QC per USP <711> with integrated viscosity trend monitoring
• Controlled polymerization initiation where precise thermal ramping and agitation symmetry affect molecular weight distribution
• Cell culture media equilibration prior to sterile filtration, minimizing thermal shock and oxygen degassing
• Environmental sample digestion protocols requiring extended heating-stirring sequences (e.g., EPA Method 3050B)
• Calibration of reference thermometers using standardized water baths with traceable thermal stability

FAQ

What external temperature sensors are compatible with the RCT 5 digital?
The instrument supports PT1000 resistance thermometers, as well as IKA’s ETS-D5 and ETS-D6 digital probe systems. ETS-D6 delivers the highest media temperature control accuracy (±0.2 K) under validated conditions.
Can the RCT 5 digital operate unattended overnight?
Yes—its safety-critical features (adjustable overtemperature limit, dry-run detection, automatic shutdown on error, and extended timer) make it suitable for supervised unattended operation in ISO 17025-accredited labs.
Is the ceramic coating chemically resistant to common solvents?
The white ceramic layer withstands exposure to diluted acids, bases, alcohols, and acetone; however, prolonged contact with concentrated HF, molten alkalis, or chlorinated solvents is not recommended.
How is speed accuracy verified during calibration?
Speed calibration follows ISO 5725-2:2019 principles using a traceable optical tachometer. At 1500 rpm under no-load conditions at 25 °C, deviation is limited to ±2 % of setpoint.
Does the instrument meet requirements for GxP documentation?
When used with validated data acquisition software and configured with user access controls, the RCT 5 digital supports ALCOA+ data integrity principles—particularly attributable, legible, contemporaneous, original, and accurate recordkeeping.