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How CPA works

The patented W.S. Tyler CPA measuring process is used to analyze the grain sizes and shapes of dry and non-agglomerating particles of bulk materials in the range from 10μm to 400mm. The robust technology is virtually maintenance free; therefore, it is absolutely fail-safe and works reliably, even under extreme conditions. The CPA technology can be used to analyze coarse and fine material, such as gravel, sand, coal, plastic granules, wood chippings, chemical and pharmaceutical products, fertilizers, and much more.

W.S. Tyler CPA systems are based upon energy-saving, low-maintenance technology that minimize operating costs. They are ready to connect to a PLC control system in their standard configuration and can also be integrated into online processes at a later date without modification. The results produced by the device are comparable with a conventional sieve analysis, but offer several decisive advantages, including high reproducibility of measuring results, enormous time saving, additional information related to grain shapes, and the number of particles.


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The principle of CPA measurement: State-of-the-art innovation.

W.S. Tyler CPA measuring instruments are based on digital image processing. A high-resolution, digital line-scan camera captures the particles in free-falling bulk materials against an LED lighting array. With a recording frequency reaching 28,000 line scans per second, the scanned lines are combined by the CPA to form an endless data record. The shadow projections of the particles are evaluated in real time in parallel with the measuring process. Up to 10,000 particles can be detected, analyzed, and counted every second. Due to a GigE camera interface, the CPA devices can be operated using a notebook without additional hardware modules, such as a camera card. The GigE technology has a high transfer rate of up to 1,000 Mbit per second.

Tailor-made solution: CPA CONVEYOR

The CPA CONVEYOR measuring process was specially developed for analyzing elongated materials where results could be falsified due to overlaying and rotation of particles while the image was being tested. During the process, the material sample is fed via a metering channel where it passes onto a faster, running conveyor belt. The resulting difference in speed separates the particles and brings them into a stable orientation (maximum length to maximum width) before the digital image analysis occurs. The CONVEYOR’s characteristics virtually eliminate random rotation of particles as they are measured.

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