进行了研究，以测试不同的颗粒计数器是否产生相同的颗粒计数和粒度分布信息，评估使用水工业其他应用中的颗粒浓度标准的可能性，并开发和测试水工业中使用的浓度标准。使用了五个粒子计数器，包括两个制造商的光遮蔽仪器（通常用于水工业）和一个电感应区（ESZ）仪器的副本。 在所有类型的样品（乳胶球，一种在其他行业用作标准的商用细测试粉尘，以及水处理厂样品）上，光遮蔽仪器始终比ESZ仪器测得的最小尺寸（205μm）的颗粒少得多，并且有证据表明ESZ仪器更准确。使用光遮蔽仪器的标准建议包括使用两种尺寸的乳胶球的多模式计数标准，这些尺寸处于标准尺寸范围的中间； 在尺寸范围的边界使用单独的尺寸标准；并避免在此时出于监管目的使用粒子计数器。包括23个参考文献、表格和图表。

Research was undertaken to test whether different particle counters yield the same particle count and size distribution information, to assess the possibility of using particle concentration standards from other applications in the water industry, and to develop and test a concentration standard for use in the water industry. Five particle counters were used, including duplicates of each of two manufacturers' light-obscuration instruments (commonly used in the water industry) and one electrical sensing zone (ESZ) instrument. On all types of samples (latex spheres, a commercially available fine test dust used as a standard in other industries, and water treatment plant samples), the light-obscuration instruments consistently measured far fewer particles in the smallest sizes (205 um) than the ESZ instrument, and evidence is presented that suggests the ESZ instrument is more correct. Recommendations for standards to use with light-obscuration instruments include using a multimodal count standard using latex spheres of two sizes, with those sizes being in the middle of standardized size ranges; using separate sizing standards at the boundaries of the size ranges; and avoiding any use of particle counters for regulatory purposes at this time. Includes 23 references, tables, figures.