Rock Products Logo

W.S. Tyler’s CPA System Offers Fast, Accurate Particle Measurement

The Computerized Particle Analysis (CPA) System from W.S. Tyler offers more precise particle measurement beyond traditional sieve analysis. Ideal for operations that perform 15-20 or more sieves per day, CPA technology uses a digital line camera to measure particles up to 10 times faster than conventional sieve methods. With up to 20,000 scans per second, the CPA’s high-resolution line camera analyzes particles as small as 10 microns, capturing particle shape and size and recording the quantity. This eliminates manual calculations and operator error, while reducing quality assurance costs. The result is more production of higher dollar value material and less waste.

CPA equipment is available in multiple sizes, the largest of which can accurately measure material up to 2 in. (51 mm) in diameter. Operations can use it on-site or in traveling labs, as well as online and inline. Using an automatic belt sampler, CPA can be used online and automated to run operator-free with scheduled or continuous sampling.

One test sample takes just three to five minutes. If material is found to be out of spec, the CPA can be programmed to sound an alarm, stop the process or even change parameters on the processing equipment. Using CPA inline means analyzing 100 percent of the material stream in real time. All CPA models use Windows-friendly software for reading, recording, calculating, analysis and display of the sample results.

Traditional sieve shakers and sieve stacks can determine particle size accurately. But with increasingly stringent quality standards, it’s often necessary to measure particle shape, and quantity. Because it involves a mechanical process, traditional sieve analysis can take up to 35 minutes to obtain these results. The sieves can encounter problems with wide tolerances, sieve blinding and manual calculations. With CPA, the material does not require preparation; size and shape are determined in a matter of seconds. Tolerance conditions and sieve blinding and pegging are eliminated. The calculations are automatic, so results are consistent between operators, shifts and plant locations, and can be repeated in large volumes if needed.

CPA is also ideal for material processors that strive to meet strict government specifications. Some government agencies have built their material quality requirements around traditional Ro-Tap measuring technology, which has been around since the early 1900s. While CPA acceptance is still in its infancy with these agencies, the technology is proven to accurately measure material for quality assurance. Occasional sieve tests can be conducted to meet their requirements, but using CPA online for consistent, accurate analysis will allow operations to save time and money and prevent waste created by out-of-spec material.

W.S. Tyler,