1.1 本试验方法包括一种现场和实验室使用的快速便携式装置，用于评估航空涡轮燃料在通过玻璃纤维凝聚材料时释放夹带或乳化水的能力。 1.2 本测试方法的程序部分包含两种不同的测试设备操作模式。操作模式之间的主要区别是通过玻璃纤维凝聚材料的燃料流量。测试方法的选择取决于要测试的特定燃料。 1.3 以国际单位表示的值应视为标准值。SI单位后括号中给出的值仅供参考，不被视为标准值。 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建立适当的安全、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》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 该测试方法提供了航空涡轮燃料中表面活性剂存在的测量。像以前过时的测试方法 2550美元 和 D3602型 ，和当前测试方法 D7224型 和 D8073 ，该测试方法可检测炼油厂处理燃料残留物的残留痕迹。它们还可以检测在从生产点到使用点的处理过程中添加到燃料中或由燃料拾取的表面活性物质。某些添加剂也可能对评级产生不利影响。其中一些物质会影响过滤器分离器从燃油中分离游离水的能力。 5.2 微分离器的测量范围为50至100。超出这些限值的值未定义且无效。在获得大于100的值的情况下，光透射率很有可能由于用于设置100参考水平的燃料中所含的材料而降低。随后，在试验的聚结部分去除材料，因此，处理后的燃料比用于获得100参考水平的燃料样品具有更高的透光率，导致最终额定值测量值超过100。 5.3 分离仪的测试模式A功能将给出与测试方法大致相同的Jet A、Jet A-1、MIL JP-5、MIL J-7和MIL JP-8燃料的额定值 2550美元 和 D3602型 使用模式A的Jet B和MIL JP-4燃料的水分离特性额定值不一定等同于试验方法 2550美元 但将给出与测试方法大致相同的评级 D3602型 所有微型分离器都具有测试模式A能力。 5.4 测试模式B选项用于确定含有燃料系统腐蚀和结冰抑制剂的MIL JP-4燃料的水分离等级。这些额定值与使用试验方法获得的额定值大致相同 2550美元 . 5.5 模式A或模式B的选择取决于具体的燃料和规格要求。 表1 确定了各种燃料的推荐试验方法。 5.6 模式A和模式B之间的基本区别是水/燃料乳液被强制通过标准玻璃纤维聚结池的流速。在模式A下，迫使乳液通过聚结池所需的时间为45 秒±2 s、 而模式B需要25 s±1 s

1.1 This test method covers a rapid portable means for field and laboratory use to rate the ability of aviation turbine fuels to release entrained or emulsified water when passed through fiberglass coalescing material. 1.2 The procedure section of this test method contains two different modes of test equipment operation. The primary difference between the modes of operation is the rate of fuel flow through the fiberglass coalescing material. Test method selection is dependent on the particular fuel to be tested. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 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 This test method provides a measure of the presence of surfactants in aviation turbine fuels. Like previous obsolete Test Methods D2550 and D3602 , and current Test Methods D7224 and D8073 , this test method can detect carryover traces of refinery treating residues in fuel as produced. They can also detect surface active substances added to or picked up by the fuel during handling from point of production to point of use. Certain additives can also have an adverse effect on the rating. Some of these substances affect the ability of filter separators to separate free water from the fuel. 5.2 The Micro-Separometer has a measurement range from 50 to 100. Values obtained outside of those limits are undefined and invalid. In the event a value greater than 100 is obtained, there is a good probability that light transmittance was reduced by material contained in the fuel used to set the 100 reference level. The material was subsequently removed during the coalescing portion of the test, thus, the processed fuel had a higher light transmittance than the fuel sample used to obtain the 100 reference level resulting in the final rating measuring in excess of 100. 5.3 Test Mode A function of the separometer will give approximately the same rating for Jet A, Jet A-1, MIL JP-5, MIL JP-7, and MIL JP-8 fuels as Test Methods D2550 and D3602 . Using Mode A water separation characteristic ratings of Jet B and MIL JP-4 fuels will not necessarily be equivalent to Test Method D2550 but will give approximately the same rating as Test Method D3602 . All Micro-Separometers have Test Mode A capability. 5.4 The Test Mode B option is used to determine water separation ratings for MIL JP-4 fuels containing fuel system corrosion and icing inhibitors. These ratings are approximately the same as those obtained using Test Method D2550 . 5.5 Selection of Mode A or Mode B depends on the specific fuel and specification requirement. Table 1 identifies the recommended test method for various fuels. 5.6 The basic difference between Modes A and B is the flow rate at which the water/fuel emulsion is forced through the standard fiberglass coalescer cell. The lapsed time required to force the emulsion through the coalescer cell in Mode A is 45 s ± 2 s, whereas, Mode B requires 25 s ± 1 s.