1.1 本规范包含参考表 8至25），给出B、E、J、K、N、R、S、T和C型热电偶的温度电动势（emf）关系。 2. 这些是工业中最常用的热电偶类型。这些表格包含本标准涵盖的热电偶类型当前可用的所有温度emf数据，可能包括所包括热电偶类型的建议温度上限以外的数据。 1.2 此外，本规范包括热电偶电动势初始值与温度的标准和特殊公差（表 1） ，热电偶延长线（表 2） 和热电偶的补偿延长线（表 3). 用户应注意，所述公差仅适用于表中给出的热电偶类型的温度范围 1、2和3，不适用于表中涵盖的温度范围 8至25。 1.3 表4和表5提供了美国常用的热电偶和热电偶延长线的绝缘颜色编码。 1.4 关于中提到的热电偶类型的温度上限的建议 1.1 表中提供了 6. 1.5 桌子 26至45给出了参考铂的单支腿热电偶的温度电动势数据（NIST Pt-67）。这些表包括类型BP、BN、JP、JN、KP（与EP相同）、KN、NP、NN、TP和TN（与EN相同）的值。 1.6 不包括RP、RN、SP和SN型热电偶的表格，因为名义上是表格 18至21表示参考纯铂的RP和SP型热电偶的热电特性。由于C型热电偶的材料通常仅作为配对供应，因此不包括C型单个热电偶的表格。 1.7 表中给出了可用于计算热电偶电动势随温度变化的多项式系数 包括每个热电偶对的电动势系数以及大多数单个热电偶对铂的电动势系数。RP和SP型热电偶的系数不包括在内，因为它们名义上与R和S型热电偶相同，而RN或SN型热电偶相对于名义上相似的Pt-67的系数无关紧要。C型热电偶的单个热电偶系数尚未确定。 1.8 表中给出了逆多项式集的系数 这些可用于计算温度（°C）作为热电偶电动势函数的近似值。 反函数仅适用于热电偶对，并且仅在指定的emf范围内有效。 1.9 本规范旨在定义符合本标准表格中所示关系的材料的热电性能，并具有本文所含的字母名称。本规范不涉及订购信息、物理和机械性能、工艺、测试和标记等主题。用户可参考特定标准，如规范 E235 , E574 , E585/E585M , E608/E608M , E1159 或 E2181/E2181M 以获取这些领域的指导。 1.10 本规范中的温度emf数据旨在供工业和实验室使用。 1.11 符合IEC 584–3的热电偶颜色代码见 附录X1 . 1.12 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。 1.12.1 括号中所述的值不是其成功值的转换，因此应独立于前面的值使用。 1.12.2 括号中给出的值是其成功值的转换。 1.12.3 将两个系统的值合并可能会导致不符合标准。 1.13 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。 1.14 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》中确立的国际公认标准化原则制定的。

1.1 This specification contains reference tables (Tables 8 to 25) that give temperature-electromotive force (emf) relationships for Types B, E, J, K, N, R, S, T, and C thermocouples. 2 These are the thermocouple types most commonly used in industry. The tables contain all of the temperature-emf data currently available for the thermocouple types covered by this standard and may include data outside of the recommended upper temperature limit of an included thermocouple type. 1.2 In addition, the specification includes standard and special tolerances on initial values of emf versus temperature for thermocouples (Table 1), thermocouple extension wires (Table 2), and compensating extension wires for thermocouples (Table 3). Users should note that the stated tolerances apply only to the temperature ranges specified for the thermocouple types as given in Tables 1, 2, and 3, and do not apply to the temperature ranges covered in Tables 8 to 25. 1.3 Tables 4 and 5 provide insulation color coding for thermocouple and thermocouple extension wires as customarily used in the United States. 1.4 Recommendations regarding upper temperature limits for the thermocouple types referred to in 1.1 are provided in Table 6. 1.5 Tables 26 to 45 give temperature-emf data for single-leg thermoelements referenced to platinum (NIST Pt-67). The tables include values for Types BP, BN, JP, JN, KP (same as EP), KN, NP, NN, TP, and TN (same as EN). 1.6 Tables for Types RP, RN, SP, and SN thermoelements are not included since, nominally, Tables 18 to 21 represent the thermoelectric properties of Type RP and SP thermoelements referenced to pure platinum. Tables for the individual thermoelements of Type C are not included because materials for Type C thermocouples are normally supplied as matched pairs only. 1.7 Polynomial coefficients which may be used for computation of thermocouple emf as a function of temperature are given in Table 7. Coefficients for the emf of each thermocouple pair as well as for the emf of most individual thermoelements versus platinum are included. Coefficients for type RP and SP thermoelements are not included since they are nominally the same as for types R and S thermocouples, and coefficients for type RN or SN relative to the nominally similar Pt-67 would be insignificant. Coefficients for the individual thermoelements of Type C thermocouples have not been established. 1.8 Coefficients for sets of inverse polynomials are given in Table 46. These may be used for computing a close approximation of temperature (°C) as a function of thermocouple emf. Inverse functions are provided only for thermocouple pairs and are valid only over the emf ranges specified. 1.9 This specification is intended to define the thermoelectric properties of materials that conform to the relationships presented in the tables of this standard and bear the letter designations contained herein. Topics such as ordering information, physical and mechanical properties, workmanship, testing, and marking are not addressed in this specification. The user is referred to specific standards such as Specifications E235 , E574 , E585/E585M , E608/E608M , E1159 , or E2181/E2181M for guidance in these areas. 1.10 The temperature-emf data in this specification are intended for industrial and laboratory use. 1.11 Thermocouple color codes per IEC 584–3 are given in Appendix X1 . 1.12 The values stated in either SI units or inch-pound units are to be regarded separately as standard. 1.12.1 The values stated in brackets are not conversions to the values they succeed and therefore shall be used independently of the preceding values. 1.12.2 The values given in parentheses are conversions of the values they succeed. 1.12.3 Combining values from the two systems may result in non-conformance with the standard. 1.13 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. 1.14 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.