1.1 本试验方法包括在0°C至40°C（32°F至104°F）的试验温度下，使用便携式数字密度计测定液态石油产品的密度、相对密度或API比重。其应用仅限于干蒸气压等于80 kPa（11.6 psi）且粘度低于100 mm的样品 2. /s（cSt）在试验温度下。 1.2 本试验方法适用于确定密度，精确到1kg/m 3. 确定密度，精确到0.1 kg/m 3. ，使用测试方法 D4052 . 1.3 该测试方法易于校准，主要适用于现场应用。对于用户来说，了解和理解分析仪使用区域的电气分类并选择适合该分类的分析仪非常重要。 1.4 试验方法 D287 , D1298 ，以及 D6822 用于现场应用。该测试方法提供了一种易于校准的替代现场方法，不会造成当前现场方法中存在的液体比重计玻璃破裂的危险。 1.5 便携式数字密度计在样品温度下测量填充样品的密度和温度。测量的密度和温度会自动转换为: 15°C时的密度/60°F时的密度 相对密度15°C/15°C/相对密度60°F/60°F API重力15°C/API重力60°F 通过仪器使用指南中定义的广义产品计算例程 D1250 . 1.6 如果密度计没有内置软件来计算参考温度下的密度，则使用石油测量表根据测试温度下的观察密度计算。 1.7 公认的密度计量单位为千克每立方米（SI单位）或克每立方厘米。以国际单位制表示的值应被视为标准。括号中的值仅供参考。国际单位制和惯用单位均已四舍五入；它们可能并不完全等同。 1.8 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。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。 1.9 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 石油产品的密度、相对密度或API比重是重要的质量指标，用于数量计算或满足应用、运输、储存和监管要求。 5.2 该试验方法不应用于确定监管转移数量计算的密度，特别是在质量或重量是数量计量单位的情况下。 试验方法 D4052 适用于这些应用。

1.1 This test method covers the determination of the density, relative density, or API gravity of liquid petroleum products using portable digital density meters at test temperatures between 0 °C and 40 °C (32 °F to 104 °F). Its application is restricted to samples with a dry vapor pressure equivalent up to 80 kPa (11.6 psi) and a viscosity below 100 mm 2 /s (cSt) at the test temperature. 1.2 This test method is suitable for determining the density to the nearest 1 kg/m 3 . To determine the density to the nearest 0.1 kg/m 3 , use Test Method D4052 . 1.3 This test method is easily calibrated and primarily suitable for field applications. It is important for the user to know and understand the electrical classification of the area in which the analyzer is to be used and to select an analyzer appropriate for that classification. 1.4 Test Methods D287 , D1298 , and D6822 are used in field applications. This test method provides an alternative field method that is easily calibrated and does not pose the hazard of hydrometer glass breakage present in current field methods. 1.5 Portable digital density meters measure the density and temperature of the filled-in sample at the sample temperature. The measured density and temperature are automatically converted into: Density at 15 °C / density at 60 °F Relative density 15 °C/15 °C / relative density 60 °F/60 °F API gravity 15 °C / API gravity 60 °F by the instrument using the calculation routines for Generalized Products as defined in Guide D1250 . 1.6 If the density meter does not have in-built software to calculate the density at the reference temperature, this is calculated from the observed density at test temperature using the Petroleum Measurement Tables. 1.7 The accepted units of measure for density are kilograms per cubic metre (SI unit) or grams per cubic centimetre. Values in SI units are to be regarded as the standard. Values in parentheses are for information only. Both SI and customary units have been rounded; they may not be exactly equivalent. 1.8 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. 1.9 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 The density, relative density, or API gravity of petroleum products are important quality indicators and are used in quantity calculations or to satisfy application, transportation, storage, and regulatory requirements. 5.2 This test method should not be used to determine density for custody transfer quantity calculations, particularly where mass or weight is the unit of quantity measurement. Test Method D4052 is appropriate for these applications.