1.1 本指南涵盖了用户测试金属护套热电偶组件的方法，包括安装前后或使用一段时间后的延长线。 1.2 测试旨在确保热电偶组件在储存或安装过程中没有损坏，确保延长线以正确的极性连接到连接器和端子上，并在测试时提供基准数据供日后参考，以评估运行后热电偶组件的可能损坏。其中一些测试可能不适用于暴露在高于特定类型推荐限值的温度下的热电偶。 1.3 本文所述的测试包括测量已安装护套热电偶组件的以下特性的方法，并提供基准数据，以确定热电偶组件是否随后在运行中损坏: 1.3.1 回路电阻: 1.3.1.1条 热元件， 1.3.1.2 组合式延长线和热电偶。 1.3.2 绝缘电阻: 1.3.2.1 绝缘、热电偶组件， 1.3.2.2 绝缘、热电偶组件和延长线。 1.3.3 塞贝克电压: 1.3.3.1 热元件， 1.3.3.2 组合延长线和热电偶组件。 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。 1.5 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》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 这些测试程序确认并记录了热电偶组件在安装之前或安装过程中没有损坏，并且延长线连接正确。 5.2 当热电偶组件首次安装在其工作环境中时，应使用测试程序。 5.3 在随后发生热电偶故障的情况下，这些程序将提供基准数据来验证故障，并可能有助于确定故障原因。 5.4 适用测试的有用性和目的将在每个类别中找到。 5.5 这些测试并不是为了确保热电偶组件能够准确测量温度。这种保证源于正确选择热电偶和仪器，并将其正确放置在测量温度的位置。欲了解更多信息，请参阅MNL 12《热电偶在温度测量中的使用手册》 2. 是一份关于金属护套热电偶应用的优秀参考文献。

1.1 This guide covers methods for users to test metal sheathed thermocouple assemblies, including the extension wires just prior to and after installation or some period of service. 1.2 The tests are intended to ensure that the thermocouple assemblies have not been damaged during storage or installation, to ensure that the extension wires have been attached to connectors and terminals with the correct polarity, and to provide benchmark data for later reference when testing to assess possible damage of the thermocouple assembly after operation. Some of these tests may not be appropriate for thermocouples that have been exposed to temperatures higher than the recommended limits for the particular type. 1.3 The tests described herein include methods to measure the following characteristics of installed sheathed thermocouple assemblies and to provide benchmark data for determining if the thermocouple assembly has been subsequently damaged in operation: 1.3.1 Loop Resistance: 1.3.1.1 Thermoelements, 1.3.1.2 Combined extension wires and thermoelements. 1.3.2 Insulation Resistance: 1.3.2.1 Insulation, thermocouple assembly, 1.3.2.2 Insulation, thermocouple assembly and extension wires. 1.3.3 Seebeck Voltage: 1.3.3.1 Thermoelements, 1.3.3.2 Combined extension wires and thermocouple assembly. 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 These test procedures confirm and document that the thermocouple assembly was not damaged prior to or during the installation process and that the extension wires are properly connected. 5.2 The test procedures should be used when thermocouple assemblies are first installed in their working environment. 5.3 In the event of subsequent thermocouple failure, these procedures will provide benchmark data to verify failure and may help to identify the cause of failure. 5.4 The usefulness and purpose of the applicable tests will be found within each category. 5.5 These tests are not meant to ensure that the thermocouple assembly will measure temperatures accurately. Such assurance is derived from proper thermocouple and instrumentation selection and proper placement in the location at which the temperature is to be measured. For further information, the reader is directed to MNL 12, Manual on the Use of the Thermocouples in Temperature Measurement 2 which is an excellent reference document on metal sheathed thermocouple uses.