Lamyrheology FIRST PLUS Direct-Drive Digital Rotational Viscometer

Overview

The Lamyrheology FIRST PLUS Direct-Drive Digital Rotational Viscometer is a precision-engineered benchtop instrument designed for reliable, high-fidelity viscosity measurement across diverse industrial and research applications. Based on the Couette principle—where torque required to rotate a spindle immersed in a fluid is directly proportional to its dynamic viscosity—the FIRST PLUS eliminates mechanical spring-based sensing systems common in legacy viscometers. Instead, it employs a brushless DC motor with direct-drive architecture, delivering consistent angular velocity regardless of sample resistance. This design ensures stable rotational speed across the full 0.3–250 rpm range, even when measuring highly viscous or shear-thinning materials such as polymer melts, bitumen, or pharmaceutical gels. The absence of mechanical springs removes drift sources associated with fatigue and temperature-induced hysteresis, thereby enhancing long-term calibration stability and reducing maintenance intervals. Built and assembled in France, the system adheres to stringent CE marking requirements and is validated for compliance with ASTM D2196 (Standard Test Methods for Rheological Properties of Non-Newtonian Materials Using a Rotational Viscometer) and ISO 2555 (Plastics — Resins in the Liquid State or as Emulsions or Dispersions — Determination of Apparent Viscosity).

Key Features

• Direct-drive motor architecture with no mechanical springs—eliminates periodic recalibration and horizontal leveling requirements.
• High-torque output (up to 13 mN·m standard version) maintains set rotational speed under load, critical for accurate measurement of non-Newtonian and high-viscosity fluids.
• 7-inch capacitive touchscreen interface supports multilingual operation, real-time parameter display (viscosity, torque, speed, time, temperature, rotor ID), and intuitive configuration of measurement protocols.
• Integrated Pt100 temperature sensor enables simultaneous temperature monitoring and compensation, supporting viscosity reporting at standardized reference temperatures per ISO 3219.
• User authentication via configurable username and 4-digit password ensures secure access control—essential for GLP/GMP-regulated environments requiring operator accountability.
• Dual torque sensitivity options: standard (0.05–13 mN·m) and low-range (0.005–0.8 mN·m) configurations accommodate both ultra-low-viscosity solvents and highly structured pastes.
• RS232 and USB ports support bidirectional communication with external PCs; optional 4–20 mA analog output facilitates integration into plant-level SCADA or DCS systems.

Sample Compatibility & Compliance

The FIRST PLUS accommodates a broad spectrum of sample types—including Newtonian liquids (e.g., mineral oils), pseudoplastic suspensions (e.g., paint formulations), thixotropic gels (e.g., cosmetic creams), and viscoelastic melts (e.g., thermoplastic resins)—through interchangeable spindles (L1–L4, R2–R7) and geometry kits. Its wide dynamic viscosity range (3–180,000,000 mPa·s) and programmable measurement duration enable robust characterization of time-dependent rheological behavior. All measurements conform to internationally recognized standards: ASTM D2196 for apparent viscosity of non-Newtonian fluids, ISO 2555 for liquid-state resins, and ISO 3219 for shear-rate-dependent viscosity curves. Optional VISCO RM software provides audit-trail functionality compliant with FDA 21 CFR Part 11 requirements, including electronic signatures, data integrity logging, and user-access history.

Software & Data Management

VISCO RM is the dedicated Windows-based software platform for remote instrument control, method development, and data export. It supports automated multi-speed ramping, time-sweep protocols for thixotropy assessment, and real-time torque/viscosity plotting. All raw and processed data—including timestamps, environmental conditions, operator IDs, and calibration metadata—are stored in encrypted .csv and .xlsx formats. The software enforces ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) through built-in audit trails, change logs, and version-controlled method templates. Exported datasets are compatible with statistical process control (SPC) tools and LIMS integration via ODBC or API endpoints.

Applications

This viscometer serves quality control laboratories in food processing (e.g., ketchup, chocolate, dairy emulsions), pharmaceutical manufacturing (suspensions, ointments, injectables), coatings and ink formulation (rheology modifiers, pigment dispersion stability), petrochemical refining (lubricant base stocks, asphalt binders), and academic research in soft matter physics and polymer science. Its ability to compute kinematic viscosity from user-input density values further expands utility in fuel specification testing per ASTM D445.

FAQ

Does the FIRST PLUS require annual spring replacement or recalibration?
No. Its spring-free, direct-drive design eliminates mechanical wear components, removing the need for scheduled spring servicing.
Can it measure thixotropic behavior?
Yes—programmable measurement duration allows users to define time-sweep protocols and quantify structural recovery rates.
Is temperature control integrated?
The system includes a Pt100 probe for real-time temperature acquisition; external Peltier or water-bath temperature control units can be connected via analog or digital interfaces.
What regulatory standards does it support for audit readiness?
VISCO RM software delivers 21 CFR Part 11-compliant audit trails, electronic signatures, and data integrity safeguards suitable for FDA, EMA, and PMDA inspections.
How is data exported for LIMS integration?
Via USB or RS232, raw and processed data export in .csv format with metadata headers; optional API integration supports automated ingestion into enterprise laboratory systems.