1.1本规范涵盖了用于核或其他高可靠性服务的单工、压实矿物绝缘、金属护套（MIMS）、K和N型热电偶的要求。根据尺寸，这些热电偶通常适用于1652的工作温度 ° F[900 ° C] ；特殊的环境条件和预期寿命可能允许其在超过2012年的温度下使用 ° F[1100 ° C] 。本规范旨在详细说明核环境中使用的此类MIMS热电偶的要求，但也可用于环境条件超过正常使用要求的实验室或一般商业应用。MIMS热电偶在特定核应用中的预期用途将需要评估热电偶的兼容性，包括温度、大气和积分中子通量对材料的影响以及买方拟定应用中热电偶的准确性。 1.2本规范并不试图包括所有可能的规范、标准等，这些规范、标准适用于可能用作护套型结构的护套、绝缘和热电偶导线的材料。本规范的要求仅包括规范允许的奥氏体不锈钢和其他合金 E585/E585M 对于护套，氧化镁或氧化铝作为绝缘材料，K型和N型热电偶导线用于热电偶（见注1）。 1.3 总体设计 — 成品热电偶的标称尺寸应为0.0400英寸。，0.0625英寸。，0.125英寸。，0.1875英寸。，或0.250英寸。[1.000 mm、1.500 mm、3.000 mm、4.500 mm或6.000 mm]。每种标称尺寸的护套尺寸和公差应符合表1和图1的要求。 1和2。本规范涵盖的热电偶测量接头类型如下: 1.3.1 样式G （接地） — 测量结与其导电护套电连接，并且 1.3.2 U型 （未接地） — 测量结与其导电护套和基准地进行电气隔离。 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值。每个系统中规定的值不是精确的等价物或转换；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。 1.5 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。 表1 G型和U型测量接头的尺寸 护套外径， A. 最低限度 鞘 墙 B 最低限度 隔热 厚 C 最低限度 金属丝 直径 D E 容忍 F 容忍 名义上的 容忍 最小值 最大值 最小值 最大值 最小值 最大值 英寸 0.0400 0.0390 0.0415 0.006 0.004 0.005 0.006 0.020 0.004 0.021 0.0625 0.0615 0.0640 0.009 0.005 0.010 0.009 0.032 0.005 0.032 0.1250 0.1240 0.1265 0.012 0.012 0.020 0.012 0.062 0.012 0.063 0.1875 0.1865 0.1890 0.020 0.022 0.031 0.020 0.093 0.022 0.095 0.2500 0.2480 0.2520 0.030 0.024 0.040 0.030 0.125 0.024 0.125 [毫米] [1.000] [0.975] [1.038] [0.15] [0.10] [0.13] [0.15] [0.51] [0.10] [0.53] [1.500] [1.475] [1.538] [0.23] [0.13] [0.25] [0.23] [0.81] [0.13] [0.81] [3.000] [2.975] [3.038] [0.30] [0.30] [0.51] [0.30] [1.57] [0.30] [1.60] [4.500] [4.475] [4.538] [0.51] [0.56] [0.79] [0.51] [2.36] [0.56] [2.41] [6.000] [5.950] [6.050] [0.76] [0.61] [1.02] [0.76] [3.18] [0.61] [3.18] 图1 G型接地测量结 图2 U型未接地测量结

1.1 This specification covers the requirements for simplex, compacted mineral-insulated, metal-sheathed (MIMS), Type K and N thermocouples for nuclear or other high reliability service. Depending on size, these thermocouples are normally suitable for operating temperatures to 1652 ° F [900 ° C]; special conditions of environment and life expectancy may permit their use at temperatures in excess of 2012 ° F [1100 ° C]. This specification was prepared to detail requirements for this type of MIMS thermocouple for use in nuclear environments, but they can also be used for laboratory or general commercial applications where the environmental conditions exceed normal service requirements. The intended use of a MIMS thermocouple in a specific nuclear application will require evaluation of the compatibility of the thermocouple, including the effect of the temperature, atmosphere, and integrated neutron flux on the materials and accuracy of the thermoelements in the proposed application by the purchaser. 1.2 This specification does not attempt to include all possible specifications, standards, etc., for materials that may be used as sheathing, insulation, and thermocouple wires for sheathed-type construction. The requirements of this specification include only the austenitic stainless steels and other alloys as allowed by Specification E585/E585M for sheathing, magnesium oxide or aluminum oxide as insulation, and Type K and N thermocouple wires for thermoelements (see Note 1). 1.3 General Design — Nominal sizes of the finished thermocouples shall be 0.0400 in., 0.0625 in., 0.125 in., 0.1875 in., or 0.250 in. [1.000 mm, 1.500 mm, 3.000 mm, 4.500 mm, or 6.000 mm]. Sheath dimensions and tolerances for each nominal size shall be in accordance with Table 1 and Figs. 1 and 2. The measuring junction styles for thermocouples covered by this specification are as follows: 1.3.1 Style G (grounded) — The measuring junction is electrically connected to its conductive sheath, and 1.3.2 Style U (ungrounded) — The measuring junction is electrically isolated from its conductive sheath and from reference ground. 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 are not exact equivalents or conversions; 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 and health practices and determine the applicability of regulatory limitations prior to use. TABLE 1 Dimensions for Style G and U Measuring Junctions Sheath Outside Diameter, A Minimum Sheath Wall, B Minimum Insulation Thickness, C Minimum Wire Diameter, D E , Tolerance F , Tolerance Nominal Tolerance min max min max min max Inches 0.0400 0.0390 0.0415 0.006 0.004 0.005 0.006 0.020 0.004 0.021 0.0625 0.0615 0.0640 0.009 0.005 0.010 0.009 0.032 0.005 0.032 0.1250 0.1240 0.1265 0.012 0.012 0.020 0.012 0.062 0.012 0.063 0.1875 0.1865 0.1890 0.020 0.022 0.031 0.020 0.093 0.022 0.095 0.2500 0.2480 0.2520 0.030 0.024 0.040 0.030 0.125 0.024 0.125 [Millimetres] [1.000] [0.975] [1.038] [0.15] [0.10] [0.13] [0.15] [0.51] [0.10] [0.53] [1.500] [1.475] [1.538] [0.23] [0.13] [0.25] [0.23] [0.81] [0.13] [0.81] [3.000] [2.975] [3.038] [0.30] [0.30] [0.51] [0.30] [1.57] [0.30] [1.60] [4.500] [4.475] [4.538] [0.51] [0.56] [0.79] [0.51] [2.36] [0.56] [2.41] [6.000] [5.950] [6.050] [0.76] [0.61] [1.02] [0.76] [3.18] [0.61] [3.18] FIG. 1 Grounded Measuring Junction, Style G FIG. 2 Ungrounded Measuring Junction, Style U