1.1 本规范涵盖了工业或高可靠性应用中矿物绝缘、金属护套贱金属热电偶的要求。它特别适用于根据规范由护套热电偶材料制成的热电偶 E585/E585M 本说明书提供了热电偶、绝缘、护套材料、测量结配置、热电偶组件长度以及过渡或终端类型的选择。 1.2 本规范还包括质量保证或验证计划要求或两者的规定，作为购买者的选择。 1.3 以SI单位或英寸-磅单位表示的值应单独视为标准值。每个系统中陈述的值不一定完全等同；因此，为确保符合标准，每个系统应独立使用，两个系统的数值不得合并使用。 1.4 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。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法规限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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====== 4.1 本规范描述了矿物绝缘、金属护套贱金属热电偶的物理要求，并为其评估建立了合适的测试标准。 4.2 给出了制造变化的标准化尺寸要求和可接受的余量。 4.3 除了可以从中选择适用的附加要求的可选测试之外，还描述了应用于本说明书涵盖的所有热电偶的一组标准测试。 4.4 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。 4.4.1 如果超过了热电偶的设计运输、储存、安装或工作温度，热电偶的防潮密封可能已经受损，并且可能不再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的条件在长时间使用后可能不再适用，并且可能需要重新测试。 4.4.2 此外，由于暴露于温度，即使在最大暴露温度低于建议的温度上限的情况下，热电偶也会产生不均匀性。 表1 因此，不建议对交付给客户的热电偶进行校准（见S6.1）。 4.4.3 此外，因为任何热电偶的EMF指示取决于热电偶沿其整个长度的状况，以及任何不均匀区域中的温度分布模式，所以所用热电偶的EMF输出对于其安装将是唯一的。由于校准设备中的温度分布不太可能与安装中的温度分布相同，因此不建议将用过的热电偶移至单独的设备进行校准。相反，建议通过与已知精度的类似热电偶进行现场校准。

1.1 This specification covers the requirements for mineral-insulated, metal-sheathed base metal thermocouples for industrial or high-reliability applications. It applies specifically to thermocouples fabricated from sheathed thermocouple material in accordance with Specification E585/E585M . The specification provides for the selection of thermoelements, insulation, sheath material, measuring junction configuration, thermocouple assembly length, and the type of transition or termination. 1.2 This specification also includes provisions for either quality assurance or verification program requirements, or both, as a purchaser’s option. 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 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 ====== 4.1 This specification describes the physical requirements of mineral-insulated, metal-sheathed base metal thermocouples and establishes suitable test criteria for their evaluation. 4.2 Standardized dimensional requirements and acceptable allowances for manufacturing variations, are given. 4.3 A set of standard tests to be applied to all thermocouples covered by this specification are described, in addition to optional tests from which applicable additional requirements may be selected. 4.4 Warning— Users should be aware that certain characteristics of thermocouples might change with time and use. 4.4.1 If a thermocouple's designed shipping, storage, installation, or operating temperature has been exceeded, the thermocouple’s moisture seal may have been compromised and may no longer prevent the deleterious intrusion of water vapor. Consequently, the thermocouple's condition established by test at the time of manufacture may not apply later after an extended period of use, and retesting may become necessary. 4.4.2 In addition, inhomogeneities can develop in thermoelements because of exposure to temperature, even in cases where the maximum exposure temperatures have been lower than the suggested upper temperature limits of Table 1 . For this reason, calibration of thermocouples destined for delivery to a customer is not recommended (see S6.1). 4.4.3 Furthermore, 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 of known accuracy is recommended.