标准摘要
[中文适用范围]： 本文档的范围重点介绍固体颗粒数 (SPN) 计数设备在发动机开发和认证环境中的设置和使用。该文件回顾了从与安装的后处理设备相关的多个样品探针插入位置的原始废气流和稀释废气流中收集和测量样品的最佳实践。包括适当的稀释技术、样品转移过程和温度管理技术。最后，还包括性能和验证检查，以确保可以快速识别长期退化和仪器故障。本文件中的目标颗粒尺寸范围为 >23 nm，符合现行的 EU SPN 法规，并且仅针对固体颗粒。当前常用的测量设备设计为在 23 nm 处的计数效率为 50%，在 40 nm 处的计数效率为 90%，因此本文档的内容主要讨论这些颗粒尺寸。 [外文原描述]： The scope of this document focuses on the setup and use of solid particle number (SPN) counting devices in both engine development and certification environments. The document reviews best practices for collecting and measuring samples from both raw and diluted exhaust gas streams across several sample probe insertion locations relative to installed aftertreatment devices. Appropriate dilution techniques, sample transfer processes, and temperature management techniques are included. Finally, performance and validation checks are covered to ensure that long-term degradation and instrument failures can be identified quickly.The particle size range targeted in this document is >23 nm, which aligns with the present EU SPN regulations and targets only solid particles. Current commonly available measurement devices are designed for counting efficiencies of 50% at 23 nm and 90% counting efficiencies at 40 nm so the contents of this document primarily address these particle sizes. It is expected that future regulations will target a lower 10 nm size cut-point. Consequently, a short section has been added discussing best practices that a user may need to consider when measuring particles in this size range.Cross Reference:
英文名称Recommended Practice for Improving Measurement Quality of Particle Number Counting Devices