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ASTM E235/E235M-12

Standard Specification for Type K and Type N Mineral-Insulated, Metal-Sheathed Thermocouples for Nuclear or for Other High-Reliability Applications
- 발행일 : 2012-05-01
- 발행기관 : ASTM
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분야

14.03 : 온도 측정

적용범위

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
Nominal	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

국제분류(ICS)코드

17.200.20 : 온도 측정 기구

페이지수

Edition

이력정보

No.	표준번호	표준명	발행일	상태
1	ASTM E235/E235M-23상세보기	Standard Specification for Type K and Type N Mineral-Insulated, Metal-Sheathed Thermocouples for Nuclear or for Other High-Reliability Applications	2023-07-01	표준
2	ASTM E235/E235M-19상세보기	Standard Specification for Type K and Type N Mineral-Insulated, Metal-Sheathed Thermocouples for Nuclear or for Other High-Reliability Applications	2019-05-01	구판
3	ASTM E235/E235M-12(2018)상세보기	Standard Specification for Type K and Type N Mineral-Insulated, Metal-Sheathed Thermocouples for Nuclear or for Other High-Reliability Applications	2018-04-01	구판
4	ASTM E235/E235M-12상세보기	Standard Specification for Type K and Type N Mineral-Insulated, Metal-Sheathed Thermocouples for Nuclear or for Other High-Reliability Applications	2012-05-01	구판