SCChengyi NXS-11B Rotational Viscometer
| Brand | SCChengyi |
|---|---|
| Origin | Sichuan, China |
| Model | NXS-11B |
| Viscosity Range | 2.8–1.78×10⁷ mPa·s |
| Shear Stress Range | 27.67–21,970 Pa |
| Shear Rate Range | 1.23–996 s⁻¹ |
| Speed Range | 5.6–360 rpm |
| Repeatability | ±1% FS (Newtonian fluids) |
| Construction | Stainless steel coaxial cylinder system |
| Instrument Type | Coaxial Cylinder Rotational Viscometer |
| Portability | Benchtop and handheld operation capable |
Overview
The SCChengyi NXS-11B Rotational Viscometer is a precision-engineered coaxial cylinder viscometer designed for absolute viscosity measurement of Newtonian fluids and rheological characterization of non-Newtonian materials under controlled shear conditions. Operating on the principle of Couette flow—where torque required to rotate an inner cylinder within a stationary outer cylinder is measured at defined angular velocities—the instrument delivers fundamental rheological data including dynamic viscosity (η), shear stress (τ), and shear rate (Ds). Its mechanical architecture supports direct determination of flow curves and consistency indices without reliance on empirical calibration models. The NXS-11B is optimized for routine quality control, formulation development, and material screening in industrial R&D environments where reproducibility, mechanical robustness, and operational flexibility are critical.
Key Features
- Coaxial cylinder geometry with stainless steel rotor and outer cup ensures long-term dimensional stability and resistance to chemical degradation from solvents, resins, oils, and suspensions.
- Wide dynamic range: viscosity coverage from 2.8 mPa·s (low-viscosity mineral oils) to 1.78×10⁷ mPa·s (highly concentrated polymer melts or bituminous slurries).
- Adjustable rotational speed from 5.6 to 360 rpm enables precise shear rate control across 1.23–996 s⁻¹—sufficient for characterizing both shear-thinning and shear-thickening behavior.
- Benchtop and handheld dual-mode operation: compact footprint (≤250 mm × 180 mm × 320 mm) and lightweight design (<3.2 kg) allow for in-process sampling in production lines or field deployment in pilot plants.
- Direct analog/digital readout with ±1% full-scale repeatability on Newtonian reference fluids (e.g., silicone oil standards traceable to NIST SRMs), verified per ASTM D2196 and ISO 2555 protocols.
- Interchangeable rotor and outer cylinder sets facilitate method adaptation across sample classes—no recalibration required when switching configurations.
Sample Compatibility & Compliance
The NXS-11B accommodates heterogeneous, opaque, and particulate-laden samples—including paint emulsions, drilling muds, cosmetic gels, food-grade syrups, and insulating varnishes—without clogging or sensor drift. Its open-cup design permits direct immersion into tanks, reactors, or storage vessels. While not certified for GLP or GMP-regulated environments out-of-the-box, the instrument’s mechanical traceability, documented repeatability, and adherence to shear-controlled measurement principles align with foundational requirements of ISO/IEC 17025 for testing laboratories. Users may implement supplementary procedural controls—including temperature stabilization (via external water jacket or Peltier stage), standardized sampling protocols, and periodic verification with certified viscosity standards—to support audit readiness under FDA 21 CFR Part 11 or EU Annex 11 frameworks.
Software & Data Management
The NXS-11B operates as a standalone analog/digital hybrid instrument with real-time torque and speed display. For enhanced data integrity, optional RS-232 or USB interface modules enable connection to third-party acquisition software (e.g., LabVIEW, MATLAB, or custom Python scripts) for time-stamped logging of τ–Ds pairs, automated flow curve generation, and statistical reporting. All raw measurements retain native units (Pa, s⁻¹, mPa·s) without proprietary scaling—ensuring compatibility with LIMS integration and cross-platform analysis workflows. Audit trails, user access logs, and electronic signature support require external software layering consistent with ALCOA+ (Attributable, Legible, Contemporaneous, Original, Accurate) data governance principles.
Applications
- Quality assurance of lubricants and hydraulic fluids per ASTM D445 and ISO 3104.
- Rheological profiling of architectural coatings during formulation optimization (e.g., sag resistance, spatter control).
- Process monitoring of polymer solutions in fiber spinning or adhesive coating lines.
- Stability assessment of suspension-based pharmaceutical excipients and topical gels.
- Evaluation of thermal degradation effects on edible oils via time-sweep viscosity tracking at fixed shear rates.
- Field validation of grouting agents and cementitious slurries in civil engineering applications.
FAQ
What standard test methods does the NXS-11B support?
It complies with core principles of ASTM D2196 (non-Newtonian fluids), ISO 2555 (aqueous polymer solutions), and GB/T 2794–2013 (Chinese national standard for adhesives), though final method validation remains the user’s responsibility.
Can temperature control be integrated?
Yes—external thermostatic jackets or Peltier-cooled outer cylinders (sold separately) can maintain sample temperature within ±0.2°C over 10–60°C ranges.
Is calibration traceable to national standards?
Calibration uses NIST-traceable silicone oil reference standards; full calibration certificates with uncertainty budgets are available upon request.
How is compliance with 21 CFR Part 11 achieved?
Through integration with validated third-party data acquisition systems that provide electronic signatures, audit trails, and role-based access control—hardware alone does not constitute Part 11 compliance.
What maintenance is required for long-term accuracy?
Annual verification of bearing friction, rotor concentricity, and torque sensor linearity using certified reference oils is recommended; stainless steel components require only mild detergent cleaning between samples.
