The semiconductor, pharmaceutical, food, and other industries, as well as clinical practice, often require the precise measurement of airborne particles to ensure the cleanliness of air. In many cases, tasks requiring such cleanliness are performed inside cleanrooms, whose cleanliness (Class) is defined by the number of particles found in a unit volume of air.Cleanrooms in which Rion’s particle counters are manufactured offer Class 3 performance. This means 1 m3 of air inside the room contains no more than 1,000 particles measuring 0.1 µm (one ten-thousands of a millimeter) and no more than 35 particles measuring 0.5 µm.You see why the number 3 is significant to Rion.The Curious Relationship Between Numbers and Rion
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