1.1 本试验方法描述了使用离线粒子定量（通常称为PQ）磁强计，通过监测悬浮在与机械运动部件接触的流体样品中的铁磁性材料的数量，来预测机械中的磨损率。它特别适用于监测润滑油和润滑脂中的磨损碎屑。 1.2 以国际单位制表示的数值应视为标准值。样品中含铁磨屑的负载（质量）值作为PQ指数报告。PQ指数是一个数值，它与铁质碎屑负载成比例。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本试验方法旨在通过趋势分析润滑油或润滑脂样品中亚铁碎屑的质量，将PQ磁强计应用于评估机械（例如发动机和变速箱）的磨损过程。 5.2 在役油分析由商业实验室定期对来自多个来源的大量样品进行，并被公认为通过趋势分析监测机械健康的可靠手段。 特别是，根据PQ指数中反映的定期提取样本中的铁质碎屑负载的任何变化，可以很容易地评估磨损程度。 5.3 PQ测量可用于快速筛选样品中是否存在铁质磨损碎屑，从而快速决定是否对样品中可能的磨损金属进行更详细的光谱分析。 5.4 使用标准化样本容器和一致的协议可以记录可靠的趋势信息。虽然不可能为异常情况指定一般限值或阈值，但建议在解释PQ值时，应参考历史数据、设备日志和/或服务历史，以制定有关机械单个项目的指南。 指导 D7720 在这方面特别有用。

1.1 This test method describes the use of offline particle quantification (often referred to as PQ) magnetometers to trend wear rates in machinery by monitoring the amount of ferromagnetic material suspended in a fluid sample that has been in contact with the moving parts of the machinery. It is particularly relevant to monitoring wear debris in lubricating oils and greases. 1.2 The values stated in SI units are to be regarded as standard. Values of the burden (mass) of ferrous wear debris in the sample are reported as a PQ Index. The PQ Index is a numerical value that scales with the ferrous debris burden. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method is intended for the application of PQ magnetometry in assessing the progression of wear in machinery, for example, engines and gearboxes, by trending the mass of ferrous debris in samples of lubricating oils or greases. 5.2 In-service oil analysis is carried out routinely by commercial laboratories on a wide range of samples from many sources and is accepted as a reliable means of monitoring machinery health by trend analysis. In particular, the extent of wear can be readily assessed from any changes in the ferrous debris burden within periodically extracted samples as reflected in the PQ Index. 5.3 PQ measurements can be used as a means of rapidly screening samples for the presence or absence of ferrous wear debris, allowing quick decisions to be made on whether or not to proceed to a more detailed spectroscopic analysis for probable wear metals in the sample. 5.4 The use of standardized sample containers and a consistent protocol enables reliable trending information to be recorded. Although it is not possible to assign general limits or thresholds for abnormal conditions, it is recommended that interpretation of PQ values should be carried out in consultation with historical data, equipment logs, and/or service history in order to formulate guidelines on individual items of machinery. Guide D7720 is particularly useful in this context.