BS ISO 9276-4:2001+A1:2017的主要目的是为分类过程的表征提供数学背景。ISO 9276的本部分不限于粒度分析中的应用，相同的程序可用于技术分类过程（如空气分类、离心分类）或分离过程（如气体或水力旋流器）的表征。交叉引用:ISO 9276-1:1998 ISO 9276-2:2014 ED2包含以下内容:修正案，2017年11月

The main object of BS ISO 9276-4:2001+A1:2017 is to provide the mathematical background for the characterization of a classification process. This part of ISO 9276 is not limited to an application in particle size analysis, the same procedure may be used for the characterization of a technical classification process (e.g. air classification, centrifugal classification) or a separation process (e.g. gas or hydrocyclones).Cross References:ISO 9276-1:1998ISO 9276-2:2014 ED2Incorporates the following:Amendment, November 2017