How Inline Particle Size Analysers Enable Real-Time Process Control in Manufacturing

In modern manufacturing environments, precision, efficiency, and consistency are non-negotiable. Whether in pharmaceuticals, chemicals, food processing, or advanced materials production, understanding and controlling particle size directly impacts product quality and performance.

Traditional offline testing methods, while accurate, are often time-consuming and reactive -providing data only after production is complete. In contrast, an in line particle size analyser enables real-time process control, allowing operators to monitor and adjust critical parameters during production, not after.

What Is an In Line Particle Size Analyser?

Anin line particle size analyseris an advanced instrument that measures the size and distribution of particles directly within the process stream — without interrupting production. These systems integrate seamlessly into pipelines, reactors, or mixers, continuously analyzing particle dynamics as they form, disperse, or aggregate.

Unlike offline analysis, where samples must be extracted, diluted, and transported to the lab, inline systems provideinstant feedback, reducing downtime and improving process understanding.

How an In Line Particle Size Analyser Works

Modern inline particle size analysers typically use Dynamic Light Scattering (DLS) technology. Cordouan Technologies’ VASCO KIN specifically employs Optical Fiber DLS with a unique backscatter configuration. Here’s how it operates:

1. Light Interaction via Optical Fiber

A frequency-stabilized laser beam is delivered through optical fibers to a remote optical head positioned at or within the sample. This contactless configuration allows measurement in reactors, vials, syringes, or process lines without sample extraction.

2. Backscatter Detection

Particles within the medium scatter light depending on their size and Brownian motion. The VASCO KIN captures scattered light at a 170° backscatter angle using a sensitive avalanche photodiode (APD) detector, enabling measurement in concentrated and optically dense samples.

3. Real-Time Correlation Analysis

Photon counts are captured and processed using advanced correlation algorithms. The Nano Kin software generates correlograms in real-time, calculating particle size distributions from the fluctuations in scattered light intensity caused by particle movement.

4. Continuous Time-Resolved Monitoring

The VASCO KIN provides exceptional temporal resolution, capturing correlograms every 200 milliseconds. Results are displayed instantly via the Nano Kin software interface, with unique 2D color mapping that visualizes size distribution evolution over time. Data is continuously logged for process documentation, retrospective analysis, and optimization.

Key Capabilities of the VASCO KIN

Cordouan Technologies’ VASCO KIN is specifically designed for real-time, in situ monitoring with several distinctive features:

• Particle Size Range: 0.5 nm to 10 µm
• Molecular Weight Measurement: 0.9 kDa to 20 MDa (valuable for protein and polymer characterization)
• Time Resolution: Correlogram acquisition every 200 ms for tracking rapid kinetic events
• Remote Optical Head: Contactless measurement enables use in challenging environments
• Time-Slicing Functionality: Retrospectively analyze data at different time resolutions to examine fast kinetic events after collection
• Multi-Instrument Compatibility: Can be combined with SAXS, UV-Vis spectroscopy, and other analytical techniques

This makes VASCO KIN ideal for tracking nanoparticle formation, crystal growth, dispersion quality, aggregation kinetics, and colloidal stability during production.

Benefits of Using an Inline Particle Size Analyser

1. Real-Time Process Control

By providing continuous feedback, an inline particle size analyser allows operators to adjust process parameters immediately- optimizing reaction conditions and reducing the risk of producing off-spec material. The ability to see changes as they happen enables proactive intervention rather than reactive correction.

2. Improved Product Consistency

Maintaining a stable particle size distribution ensures uniform texture, solubility, bioavailability, and performance. In pharmaceuticals, this directly affects drug efficacy and dissolution rates. In food manufacturing, it impacts mouthfeel and product appeal. In coatings, it determines color consistency and opacity.

3. Reduced Waste and Downtime

Real-time monitoring eliminates the lag between sampling and result analysis. Manufacturers can catch deviations early, avoiding costly rework, scrap, or production halts. This is particularly valuable during scale-up and process transfer activities.

4. Enhanced Process Understanding

Continuous measurement helps identify trends, reaction kinetics, particle growth mechanisms, and aggregation patterns. The time-resolved data from systems like VASCO KIN provides insights that snapshot measurements simply cannot capture, offering valuable information for process optimization and quality by design (QbD) initiatives.

5. Regulatory and Quality Compliance

Industries operating under GMP, FDA, or ISO regulations benefit from the traceable, time-stamped data that inline systems provide. The continuous monitoring documentation ensures full compliance for audits, validation, and regulatory submissions, supporting Process Analytical Technology (PAT) initiatives.

Applications of In Line Particle Size Analysis

The use of in line particle size analysers spans a wide range of industries:

In each of these sectors, inline measurement provides a powerful advantage enabling real-time measurement integration and data-driven manufacturing.

Best Practices for Implementing In Line Particle Size Analysis

1. Integrate Early in Process Design

Position the analyser at critical control points—typically after mixing, during crystallization, or following dispersion steps—for optimal sampling and feedback. Consider the optical path and ensure representative sampling.

2. Calibrate Regularly

Maintain calibration using standard reference materials (polystyrene latex beads, silica nanoparticles) to ensure measurement accuracy and traceability over time.

3. Optimize Flow and Sampling Conditions

Ensure representative sampling through proper mixing and flow dynamics. The remote optical head design of VASCO KIN provides flexibility for positioning in optimal measurement zones. Consider particle concentration, turbidity, and whether static or flowing measurement is most appropriate.

4. Leverage Time-Slicing Functionality

Use VASCO KIN’s unique time-slicing feature to retrospectively analyze data at different time resolutions. This allows detailed examination of fast kinetic events after data collection, helping identify critical process windows and optimal operating conditions.

5. Combine with Complementary Analytics

Integrate particle size data with temperature, pH, turbidity, concentration sensors, or spectroscopic techniques to build a complete process profile. VASCO KIN’s compatibility with SAXS and UV-Vis spectroscopy enables powerful multi-parameter monitoring.

6. Implement Robust Data Management

Establish protocols for data logging, trending, and alarm thresholds. Time-stamped continuous data provides an invaluable record for troubleshooting, process optimization, and regulatory documentation.

7. Train Operators Thoroughly

Ensure staff understand not just how to operate the instrument, but how to interpret real-time data trends and recognize signs of process deviation. The Nano Kin software’s intuitive 2D color mapping helps visualize changes quickly.

The VASCO KIN Product Family Context

Cordouan Technologies offers a comprehensive portfolio of particle characterization instruments, each designed for specific applications:

• VASCO – Standard benchtop DLS analyzer for routine particle size measurements
• VASCO KIN – Time-resolved inline analyzer for real-time process monitoring
• AMERIGO – 3-in-1 system measuring particle size, zeta potential, and molecular weight
• WALLIS – High-resolution zeta potential analyzer for detailed electrophoretic characterization

VASCO KIN stands out as the solution specifically engineered for process monitoring, quality control, and PAT applications where real-time feedback is essential.

From Reactive to Proactive Manufacturing

The future of manufacturing lies in real-time control and predictive insight. By implementing an inline particle size analyser like the VASCO KIN, companies can shift from reactive quality checks to proactive optimization—reducing waste, improving yield, and achieving consistent, high-quality results.

The continuous, time-resolved monitoring capabilities of modern inline systems transform particle size data from a quality checkpoint into a powerful process control parameter. This enables manufacturers to:

• Detect and correct deviations before they impact product quality
• Optimize formulation and process conditions with rapid feedback
• Reduce development time through better process understanding
• Document manufacturing processes for regulatory compliance
• Scale up processes with confidence based on kinetic understanding

Partner with Barnett Technical Services

Partnering with Barnett Technical Services, the authorized U.S. distributor of Cordouan Technologies, ensures access to cutting-edge instruments and expert application support. Our team provides:

• Technical Consultation – Helping you select the right instrumentation for your specific application
• Application Development – Working with you to optimize measurement protocols and integration
• Training & Support – Comprehensive training for your team and ongoing technical assistance
• Service & Calibration – Maintaining your investment for long-term reliability

Transform your process monitoring into process mastery. Contact Barnett Technical Services today for a consultation and demonstration of the VASCO KIN inline particle size analyser.