1.1 本试验方法包括在10%范围内定量测定新润滑油和在用润滑油及添加剂中的水分  mg/kg至100 000 毫克/千克（0.001 重量/重量至10 % wt./wt.）使用相对湿度（RH）传感器。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值。本标准不包括其他计量单位。 1.3 警告- 本试验方法中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和健康实践，并确定监管限制的适用性。 ====意义和用途====== 5.1 了解润滑油、添加剂和类似产品的含水量对于此类石油产品的制造、购买、销售、转让或使用非常重要，有助于预测其质量和性能特征。 5.2 对于润滑油，水的存在可能导致过早腐蚀和磨损，碎屑负载增加，导致润滑减少和过滤器过早堵塞，对添加剂作用的阻抗，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 and health practices and determine the applicability of regulatory limitations prior to use. ====== 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.