Brookfield RST Series Touchscreen Rotational Rheometer

Overview

The Brookfield RST Series Touchscreen Rotational Rheometer is a precision-engineered instrument designed for comprehensive rheological characterization of complex fluids and soft solids. Operating on the principle of controlled-stress and controlled-rate rotational rheometry—based on Couette flow geometry—the RST delivers high reproducibility in measuring viscosity, yield stress, viscoelastic moduli (G′, G″), creep compliance, stress relaxation, and thixotropic recovery. Its modular architecture supports interchangeable geometries including concentric cylinder, cone-and-plate, parallel-plate, and vane/spindle systems, enabling method flexibility across diverse sample types—from low-viscosity solvents to highly structured pastes and gels. Engineered for laboratory and quality control environments, the RST meets fundamental requirements for traceable, repeatable, and auditable rheological testing under ISO 16520, ASTM D2196, and USP <912> guidelines.

Key Features

• Intuitive 7-inch LED touchscreen interface with graphical real-time display of torque, speed, temperature, and viscosity trends
• Automatic measurement system recognition—detects geometry type, dimensions, and calibration constants upon attachment
• Motorized gap adjustment for cone-and-plate and parallel-plate configurations, ensuring consistent sample loading and minimizing operator-induced error
• Rapid tool-free spindle coupling mechanism compatible with Brookfield’s full range of shear-sensitive and high-torque accessories
• Mechanical bearing design optimized for long-term stability and minimal drift during extended creep or oscillatory tests
• Wide dynamic torque range (0.15 µNm resolution up to 100 mNm) and broad rotational speed coverage (0.01–1300 RPM) support both ultra-slow structural breakdown analysis and high-shear processing simulation
• Chemically resistant, smooth-surface housing facilitates rapid decontamination between samples—critical for pharmaceutical and food-grade validation protocols

Sample Compatibility & Compliance

The RST accommodates Newtonian and non-Newtonian liquids, suspensions, emulsions, gels, melts, and semi-solids across industries including polymer science, pharmaceutical formulation, food R&D, cosmetics, coatings, and specialty chemicals. Its geometry versatility ensures accurate measurement of materials with yield behavior (e.g., toothpaste, battery slurries), time-dependent responses (e.g., yogurt, sealants), and temperature-sensitive rheology (e.g., hot-melt adhesives). The instrument complies with GLP/GMP documentation standards when used with Rheo3000 software’s audit trail, electronic signatures, and 21 CFR Part 11–compliant user access controls. All calibration certificates are NIST-traceable, and geometry verification follows ISO 3219 and ASTM D4402 procedures.

Software & Data Management

Rheo3000 software—developed exclusively for AMETEK Brookfield RST instruments—runs natively on Windows OS and provides full test automation, data acquisition, and post-processing capabilities. It supports multi-step test sequences (e.g., ramped shear, oscillatory sweeps, creep-recovery cycles) with programmable temperature profiles synchronized via Peltier or external bath controllers. Data is stored in a secure, relational SQL database with role-based permissions, enabling centralized access for cross-functional teams while maintaining data integrity and version control. Analytical tools include QC limit monitoring, curve fitting to Newtonian, Bingham, Casson, Ostwald-de Waele, Steiger-Ory, and Herschel-Bulkley models, customizable graphing (log-log, linear-linear, Cole-Cole), and export to CSV, Excel, or PDF formats. The open-source framework allows integration with LIMS and enterprise MES platforms via standard ODBC drivers.

Applications

• Polymer & Petrochemicals: Melt viscosity profiling of thermoplastics; lubricant shear-thinning assessment; asphalt binder aging studies
• Pharmaceuticals: Yield stress quantification of topical gels; suspension stability evaluation via thixotropy loops; injectable hydrogel viscoelasticity mapping
• Foods: Chocolate tempering behavior; dairy product structure recovery after pumping; starch gelatinization kinetics
• Coatings & Inks: Pigment dispersion stability; sprayability prediction from high-shear viscosity; leveling performance modeling
• Personal Care: Shampoo thinning under shear; moisturizer film formation dynamics; sunscreen SPF correlation with droplet deformation resistance
• Electrochemical Materials: Slurry rheology for lithium-ion battery electrode coating; solid electrolyte paste extrudability

FAQ

What geometry options are supported by the RST rheometer?

The RST accepts concentric cylinder, cone-and-plate, parallel-plate, and vane geometries—all with automatic ID recognition and pre-loaded calibration parameters.
Is the RST compliant with FDA 21 CFR Part 11 requirements?

Yes, when operated with Rheo3000 software configured with audit trail logging, electronic signatures, and user permission tiers, the system satisfies Part 11 criteria for regulated environments.
Can the RST perform oscillatory frequency sweeps?

While the base RST hardware supports controlled-rate and controlled-stress modes, oscillatory testing requires optional firmware upgrade and compatible transducer modules—consult Brookfield technical documentation for model-specific capability validation.
How is temperature control integrated?

The RST interfaces with third-party Peltier stages (e.g., Thermocouple-equipped Peltier plates) and external circulating baths; temperature ramps and isothermal holds are fully programmable within Rheo3000.
What data security features does Rheo3000 offer?

Role-based login, encrypted SQL database storage, immutable audit logs, and configurable data retention policies ensure alignment with ISO 27001 and internal data governance policies.