开展研究和测试，为ASHRAE 52.2标准（ASHRAE 1287-RP）中的颗粒计数器提供科学合理且基于技术的规范。这个问题涉及到标准的核心——粒子计数器。本标准是围绕使用光学粒子计数器（OPC）在测试空气滤清器的上游和下游进行气溶胶浓度测量而编写的。虽然本标准中提供了颗粒计数器的规范，但有人担心这些规范可能不足以确保计数器之间的重复测量。通过制定改进的颗粒计数器规范，预计52.2试验的准确性和再现性将得到提高。该项目分两部分进行。第一部分是一个非测试阶段，重点是确定过滤器效率测试结果差异被认为存在的实例- 相关的第二部分侧重于测试和调查，以确定OPC的哪些方面是造成差异的原因，并为粒子计数器定义新的规范，以消除或最小化此类差异。

Research and testing were conducted to provide scientifically sound and technically-based specifications for particle counters in the ASHRAE 52.2 standard (ASHRAE 1287-RP). The question addressed goes to the heart of the standard - the particle counter. The standard is written around the use of optical particle counters (OPCs) to perform aerosol concentration measurements upstream and downstream of the test air cleaner.While specifications for the particle counter are provided in the standard, there have been concerns that these specifications may not be adequate to ensure reproducible measurements from counter to counter. By developing improved specifications for the particle counters, it is anticipated that the accuracy and reproducibility of the 52.2 tests will be improved.The project was conducted in two parts. Part I was a non-testing phase focused on identifying instances where differences in filter efficiency test results were believed to be OPC-related. Part II focused on testing and investigation to determine what aspects of the OPC were responsible for the differences and on defining new specifications for the particle counter that will eliminate or minimize such discrepancies.