ISO 3310 Clarification Help - Aperture sizes for sieves used for particle sorting

#1
Hello,

The ISO 3310 standard defines aperture sizes for sieves used for particle sorting. I'm looking at one of the tables that defined the tolerances of the apertures and I'm a little confused by what it says. It provides the following information for each nominal aperture size.

"For any aperture size (+X)" with X values stated.
"For average aperture size (±Y)" with Y values stated.
"Maximum standard deviation (sigma_0)" with sigma_0 values stated.

What I don't understand is how I should read the first two columns. For a given aperture size, would I automatically add the X value, which is then toleranced by Y? Any insight into this would be much appreciated!
 
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#2
Good day Quality_Strong, I am sorry for the delay in this response.

Tokyo Screen (I am not affiliated) describes X as Maximum Aperture and Y as Average Aperture (see Tables 1 and 2 in their company document). Sigma is a mathematical derivation. NIST (page 155) describes standard deviation (of a sample) "a measure of the dispersion of variates observed in a sample expressed as the positive square root of the sample variance."

Does this help?
 
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