1.1 本试验方法描述了一种确定在用润滑剂中存在的燃料稀释量的方法。这是通过将润滑剂中的表面声波（SAW）传感器蒸汽吸入到表面声波中来实现的。燃料蒸汽将被SAW传感器的聚合物涂层吸收。然后，吸光度的量与润滑剂中的燃料含量有关。 1.2 能够通过试验方法测量的燃料稀释范围为0.1 % 至10.0 % 通过燃料的质量稀释。 1.3 该试验方法专门用于确定在用润滑剂（包括新使用的润滑剂）的燃料稀释度。该方法适用于柴油、汽油和喷气燃料的污染。 1.4 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 参见第节 9 . 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 该试验方法提供了一种快速、无需准备的可靠现场测定燃料稀释度的方法。结果大约在1 min。例如，在偏远的铁路车站使用这种方法，在那里无法执行标准实验室方法来确定燃料稀释度，如测试方法中所述 第7593页 ，但关键是需要确定燃料是否污染了润滑剂。如果燃油污染了润滑剂，这对机器非常有害，通常会立即进行维修。此外，燃料可以在机械润滑剂路径中遇到的高温下点燃。

1.1 This test method describes a means for determining the amount of fuel dilution present in an in-service lubricant. This is achieved by drawing into a surface acoustic wave (SAW) sensor vapor from the lubricant. Fuel vapor will be absorbed by the SAW sensor’s polymer coating. The amount of absorbance is then related to fuel content in the lubricant. 1.2 The range of fuel dilution capable of being measured by the test method is from 0.1 % to 10.0 % by mass fuel dilution. 1.3 This test method is specifically tailored to determining the fuel dilution of in-service lubricants, including newly utilized lubricants. The method is applicable to contamination with diesel, gasoline, and jet fuels. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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. See Section 9 . 1.6 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 provides a means for a reliable field determination of fuel dilution that is quick and preparation-free. Results are obtained in approximately 1 min. Such a method is used, for example, at remote railroad depots where it is impractical to carry out a standard laboratory method for determination of fuel dilution, such as described in Test Method D7593 , but it is a critical need to determine if fuel has contaminated the lubricant. If fuel has contaminated the lubricant, this is significantly detrimental to the machinery and it is typically serviced immediately. Further, the fuel can ignite at the high temperatures encountered in machinery lubricant paths.