1.1 本文件列出了矿物绝缘、金属护套（MIMS）热电偶组件和热电偶电缆的测试方法，但不要求进行任何此类测试，也没有说明验收标准。验收标准在其他ASTM标准规范中给出，这些规范对这些热电偶和电缆进行了测试。ASTM热电偶规范中给出了许多测试的验收标准示例。这些表中的值不一定是满足这些测试所需的值，但仅作为示例包括在内。 1.2 这些测试旨在支持质量控制，并评估铠装热电偶电缆或组件在特定应用中的适用性。 给出了一些获得相同信息的替代测试方法，因为在给定的情况下，替代测试方法可能更实用。使用条件变化很大，因此所描述的所有测试不太可能适用于给定的热电偶应用。在每个测试描述之后都会做一个简短的陈述，以表明何时可以使用它。 1.3 本文所述的测试包括测量铠装热电偶材料和组件以下性能的测试方法。 1.3.1 绝缘性能: 1.3.1.1 压实-- 直接法、吸收法和张力法。 1.3.1.2 厚 1.3.1.3 反对 --在室温和高温下。 1.3.2 护套特性: 1.3.2.1 完整性-- 两种试水方法和质谱仪。 1.3.2.2 尺寸-- 长度、直径和圆度。 1.3.2.3 壁厚 。 1.3.2.4 表面 --肉眼检查、表面处理、通过染料渗透剂进行的缺陷检测以及通过张力试验进行的冷搭接检测。 1.3.2.5 冶金结构 。 1.3.2.6 延展性 --弯曲试验和拉伸试验。 1.3.3 热电偶元件特性: 1.3.3.1 标定 。 1.3.3.2 同质性 。 1.3.3.3 漂流 。 1.3.3.4 热电偶元件直径、圆度和表面外观 。 1.3.3.5 热电偶元件间距 。 1.3.3.6 热电偶延展性 。 1.3.3.7 冶金结构 。 1.3.4 热电偶组件特性: 1.3.4.1 尺寸-- 长度、直径和圆度。 1.3.4.2 表面-- 肉眼检查、表面处理、参考接头端部水分密封以及通过染料渗透剂进行的缺陷检测。 1.3.4.3 电气-- 连续性、回路电阻和连接器极性。 1.3.4.4 射线照相检查 。 1.3.4.5 热电偶元件直径 。 1.3.4.6 热响应时间 。 1.3.4.7 热循环 。 1.4 以国际单位制或英寸磅单位表示的数值应单独视为标准。每个系统中规定的值可能不是完全相等的；因此，每个系统应独立使用。将两个系统的值合并可能导致不符合标准。 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。 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 本标准描述了其他ASTM规范中使用的测试方法，以确定热电偶组件和热电偶电缆特性的某些可接受方法。 这些试验方法规定了如何确定这些特性。 5.2 针对测试类别，给出了所包含测试的有用性和目的。 5.3 警告-- 用户应注意，热电偶的某些特性可能会随着时间和使用而变化。如果超过了热电偶的设计运输、储存、安装或操作温度，则该热电偶的湿气密封可能已经受到损害，并且可能不再充分防止水蒸气的有害侵入。因此，在制造时通过测试确定的热电偶条件以后可能不适用。此外，由于暴露在更高的温度下，即使在最高暴露温度低于规范表1中规定的建议使用温度上限的情况下，热电元件也可能出现不均匀性 E608/E608M 因此，不建议对交付给客户的热电偶进行校准。由于任何热电偶的电动势指示取决于热电元件沿其整个长度的状况，以及任何不均匀性区域的温度分布模式，因此所用热电偶的电动动势输出将是其安装所特有的。由于校准设备中的温度分布不太可能与安装的温度分布重复，因此不建议将用过的热电偶移到单独的设备中进行校准。相反 就地 通常建议通过与已知良好的类似热电偶进行比较来进行校准。

1.1 This document lists methods for testing Mineral-Insulated, Metal-Sheathed (MIMS) thermocouple assemblies and thermocouple cable, but does not require that any of these tests be performed nor does it state criteria for acceptance. The acceptance criteria are given in other ASTM standard specifications that impose this testing for those thermocouples and cable. Examples from ASTM thermocouple specifications for acceptance criteria are given for many of the tests. These tabulated values are not necessarily those that would be required to meet these tests, but are included as examples only. 1.2 These tests are intended to support quality control and to evaluate the suitability of sheathed thermocouple cable or assemblies for specific applications. Some alternative test methods to obtain the same information are given, since in a given situation, an alternative test method may be more practical. Service conditions are widely variable, so it is unlikely that all the tests described will be appropriate for a given thermocouple application. A brief statement is made following each test description to indicate when it might be used. 1.3 The tests described herein include test methods to measure the following properties of sheathed thermocouple material and assemblies. 1.3.1 Insulation Properties: 1.3.1.1 Compaction— direct method, absorption method, and tension method. 1.3.1.2 Thickness. 1.3.1.3 Resistance —at room temperature and at elevated temperature. 1.3.2 Sheath Properties: 1.3.2.1 Integrity— two water test methods and mass spectrometer. 1.3.2.2 Dimensions— length, diameter, and roundness. 1.3.2.3 Wall thickness . 1.3.2.4 Surface —gross visual, finish, defect detection by dye penetrant, and cold-lap detection by tension test. 1.3.2.5 Metallurgical structure . 1.3.2.6 Ductility —bend test and tension test. 1.3.3 Thermoelement Properties: 1.3.3.1 Calibration . 1.3.3.2 Homogeneity . 1.3.3.3 Drift . 1.3.3.4 Thermoelement diameter, roundness, and surface appearance . 1.3.3.5 Thermoelement spacing . 1.3.3.6 Thermoelement ductility . 1.3.3.7 Metallurgical structure . 1.3.4 Thermocouple Assembly Properties: 1.3.4.1 Dimensions— length, diameter, and roundness. 1.3.4.2 Surface— gross visual, finish, reference junction end moisture seal, and defect detection by dye penetrant. 1.3.4.3 Electrical— continuity, loop resistance, and connector polarity. 1.3.4.4 Radiographic inspection . 1.3.4.5 Thermoelement diameter . 1.3.4.6 Thermal response time . 1.3.4.7 Thermal cycle . 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the 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. 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 standard provides a description of test methods used in other ASTM specifications to establish certain acceptable methods for characterizing thermocouple assemblies and thermocouple cable. These test methods define how those characteristics shall be determined. 5.2 The usefulness and purpose of the included tests are given for the category of tests. 5.3 Warning— Users should be aware that certain characteristics of thermocouples might change with time and use. If a thermocouple’s designed shipping, storage, installation, or operating temperature has been exceeded, that thermocouple’s moisture seal may have been compromised and may no longer adequately prevent the deleterious intrusion of water vapor. Consequently, the thermocouple’s condition established by test at the time of manufacture may not apply later. In addition, inhomogeneities can develop in thermoelements because of exposure to higher temperatures, even in cases where maximum exposure temperatures have been lower than the suggested upper use temperature limits specified in Table 1 of Specification E608/E608M . For this reason, calibration of thermocouples destined for delivery to a customer is not recommended. Because the emf indication of any thermocouple depends upon the condition of the thermoelements along their entire length, as well as the temperature profile pattern in the region of any inhomogeneity, the emf output of a used thermocouple will be unique to its installation. Because temperature profiles in calibration equipment are unlikely to duplicate those of the installation, removal of a used thermocouple to a separate apparatus for calibration is not recommended. Instead, in situ calibration by comparison to a similar thermocouple known to be good is often recommended.