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A reliable method of extracting a representative sample from a bulk of particulate material that is both reproducible and operator–independent, is fundamental to the consistent processing of powders and granular materials.
Several conventional methods to extract a proportion from a bulk of particulates are used. Many organizations rely on operators to perform exactly the same critical procedure, repeatedly. Manual error introduced during these critical steps amplifies sampling error. Introduced in 1970, spinning rifflers are designed to address this problem. Spin riffling is the most reproducible and operator–independent method yet developed to extract representative samples from a bulk quantity of particles.
Microscal Spinning Rifflers offer the widest range of particulate samplers designed to provide the highest reproducibility and precision in representative sampling at an affordable cost. In fact, the cost consequences of using un–representative samples are potentially much greater.
Spinning Rifflers offer a simple and dependable sampling method which approaches the best that is theoretically possible. The technique overcomes segregation, heterogeneity, and stratification while virtually eliminating operator–introduced error.
Spinning rifflers produce the highest sampling accuracy
The high reliability of spin riffling compared to other methods of sample generation was published by T. Allen and A.A. Khan in The Chemical Engineer, 1970. Their sampling test based on a 60%/40% mixture by weight of coarse and fine sands produced the following comparisons:
Thus spin riffling yields a sampling error far less than the other methods, which is also very close to genuine random variation (i.e. that which is theoretically possible).
L.A. Kressin in Powder and Bulk Engineering, July 1989, (in his article "How to use dry sieving tests") states "The table [shown above] shows that spin riffling is a superior division method: the rotating tray removes all chance of operator error".
Application Areas
- Catalysts and Supports
- Coals and Active Carbons
- Fillers and Fines
- Fly Ash and Glass
- Gemstones
- Minerals, Ores and Concentrates
- PCB Recovery and Glass
- Particulate feed stock
- Pharmaceuticals
- Precious Metal Powders
- Rare Earth Sands
- Soils and Geological Samples
- Standards and Round Robins
- Toners and Pigments ...
- ... et al
Versatile spin riffling meets your sampling needs!
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