颗粒计数在饮用水应用中的独特价值在于，它能够检测单个颗粒，并根据颗粒的大小列举这些颗粒。与浊度或粒子监测器等云粒子检测技术相比，这种单粒子灵敏度具有巨大的优势，因为它允许在出现单个粒子时对其进行检测和大小分类。然而，如果无法验证尺寸和计数精度，该灵敏度的价值很小。本文介绍了允许粒子计数器在计算机上进行尺寸和计数校准或验证的程序和配置- 现场，即使安装到位，也能确保在最终使用点进行适当校准。本文描述了一种特殊的技术和设备配置，允许在现场进行尺寸校准和计数验证，可追溯到绝对标准，使用尺寸和计数标准或仅使用更容易获得的尺寸标准。

The unique value of particle counting for drinking water applications lies in its ability to detect individual particles and enumerate those particles according to their sizes. This single particle sensitivity affords tremendous advantage over cloud particle detection techniques like turbidity or particle monitors, as it allows individual particles to be detected and size categorized whenever they occur. However, this sensitivity is of little value if the size and count accuracy cannot be verified. This paper presents procedures and configurations that allow particle counters to be both size and count calibrated or validated on-site, even when mounted in place, thus ensuring proper calibration at the final point of use. A particular technique and equipment configuration are described that allow both size calibration and count validation to be performed on-site, traceable to absolute standards, using either size and count standards or only the more readily available size standards.