1.1 本试验方法涵盖了在10  mg/kg至100 000 mg/kg（0.001 重量/重量至10 % wt./wt.）使用相对湿度（RH）传感器测量。已知甲醇、乙腈和其他化合物会干扰本试验方法。 1.2 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。 1.3 警告 用这种测试方法测试的样品可能是易燃、易爆和有毒的。在测试前后处理时要小心。 1.4 本标准并不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。 1.5 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 润滑油、添加剂和类似产品的含水量知识在此类石油产品的制造、购买、销售、转让或使用中非常重要，有助于预测其质量和性能特征。 5.2 对于润滑油，水的存在会导致过早腐蚀和磨损，碎屑负载的增加会导致润滑减少和过滤器过早堵塞，对添加剂的影响产生阻抗，以及有害细菌生长的不良支持。

1.1 This test method covers the quantitative determination of water in new and in-service lubricating oils and additives in the range of 10  mg/kg to 100 000 mg/kg (0.001 wt./wt. to 10 % wt./wt.) using a relative humidity (RH) sensor. Methanol, acetonitrile, and other compounds are known to interfere with this test method. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 Warning— Samples tested in this test method can be flammable, explosive, and toxic. Use caution when handling them before and after testing. 1.4 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. 1.5 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 Knowledge of the water content of lubricating oils, additives, and similar products is important in the manufacture, purchase, sale, transfer, or use of such petroleum products to help in predicting their quality and performance characteristics. 5.2 For lubricating oils, the presence of water can lead to premature corrosion and wear, an increase in the debris load resulting in diminished lubrication and premature plugging of filters, impedance to the effect of additives, and undesirable support of deleterious bacterial growth.