1.1本规范涵盖了用于工业或高可靠性应用的矿物绝缘金属护套母材热电偶的要求。它特别适用于根据规范E585/E585M由铠装热电偶材料制成的热电偶。本规范规定了热电偶、绝缘、护套材料、测量接头配置、热电偶组件长度以及过渡或终止类型的选择。 1.2本规范还包括买方选择的质量保证或验证计划要求或两者的规定。 1.3以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 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====== 4.1本规范描述了矿物绝缘金属护套母材热电偶的物理要求，并为其评估建立了合适的测试标准。 4.2给出了标准尺寸要求和制造变化的可接受容差。 4.3除可选试验外，还描述了适用于本规范涵盖的所有热电偶的一组标准试验，可从中选择适用的附加要求。 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，则热电偶的防潮密封可能已受损，并且可能不再阻止水蒸汽的有害侵入。 因此，在制造时通过测试确定的热电偶条件在延长使用期后可能不适用，因此可能需要重新测试。 4.4.2此外，由于暴露在温度下，即使在最大暴露温度低于建议的温度上限的情况下，也可能在热电偶中形成不均匀性 表1 . 因此，不建议校准交付给客户的热电偶（见S6.1）。 注1 — 该表给出了几种常见护套尺寸下各种热电偶的建议温度上限。 它没有考虑护套材料本身的环境温度限制，也没有解决热电偶材料和包含它们的护套之间的兼容性问题。特定情况下的实际最高实际温度通常限于所涉及的几个因素中的最低温度。买方应参考ASTM手册12 5. 和其他文献来源，以获取有关应用程序的更多信息。 注释2 — 此处给出的温度限值仅供买方参考，不应视为绝对值，也不应作为令人满意的寿命或性能保证。 这些类型和尺寸有时在高于给定极限的温度下使用，但通常以牺牲稳定性或使用寿命或两者为代价。在其他情况下，可能需要降低给定的限制，以实现足够的服务。 4.4.3此外，由于任何热电偶的电动势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的温度分布模式，因此所用热电偶的电动势输出将仅适用于其安装。由于校准设备中的温度曲线不太可能与安装的温度曲线重复，因此不建议将使用过的热电偶移到单独的设备中进行校准。 相反，建议通过与已知精度的类似热电偶进行比较进行现场校准。

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 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. 1.4 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 ====== 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). Note 1 — This table gives the suggested upper temperature limits for the various thermocouples in several common sheath sizes. It does not take into account environmental temperature limitations of the sheath material itself, nor does it address compatibility considerations between the thermoelement materials and the sheath containing them. The actual maximum practical temperature in a particular situation will generally be limited to the lowest temperature among the several factors involved. The purchaser should consult ASTM Manual 12 5 and other literature sources for further information about applications. Note 2 — The temperature limits given here are intended only as a guide to the purchaser and should not be taken as absolute values nor as guarantees of satisfactory life or performance. These types and sizes are sometimes used at temperatures above the given limits, but usually at the expense of stability or service life, or both. In other instances, it may be necessary to reduce the given limits in order to achieve adequate service. 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.