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ASTM E 235/E235M : 2012 : R2018

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Standard Specification for Type K and Type N Mineral-Insulated, Metal-Sheathed Thermocouples for Nuclear or for Other High-Reliability Applications
Available format(s)

Hardcopy , PDF

Superseded date

07-14-2023

Language(s)

English

Published date

04-01-2018

CONTAINED IN VOL. 14.03, 2018 Specifies the requirements for simplex, compacted mineral-insulated, metal-sheathed (MIMS), Type K and N thermocouples for nuclear or other high reliability service.

1.1This 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).

1.3General 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:

FIG. 1 Grounded Measuring Junction, Style G

 Grounded Measuring Junction, Style G Grounded Measuring Junction, Style G

FIG. 2 Ungrounded Measuring Junction, Style U

 Ungrounded Measuring Junction, Style U Ungrounded Measuring Junction, Style U

1.3.1Style G2 (grounded)The measuring junction is electrically connected to its conductive sheath, and

1.3.2Style U2 (ungrounded)The measuring junction is electrically isolated from its conductive sheath and from reference ground.

1.4The 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.

1.5This 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.

1.6This 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.

Committee
E 20
DevelopmentNote
Supersedes ASTM E 235. (08/2012)
DocumentType
Standard
Pages
6
ProductNote
Reconfirmed 2018
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy

ASTM E 230 : 2003 Standard Specification and Temperature-Electromotive Force (EMF) Tables for Standardized Thermocouples
ASTM A 262 : 2015 : REDLINE Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
ASTM E 585/E585M : 2012-06 SPECIFICATION FOR COMPACTED MINERAL-INSULATED, METAL-SHEATHED, BASE METAL THERMOCOUPLE CABLE
ASTM E 1652 : 2015 : REDLINE Standard Specification for Magnesium Oxide and Aluminum Oxide Powder and Crushable Insulators Used in the Manufacture of Base Metal Thermocouples, Metal-Sheathed Platinum Resistance Thermometers, and Noble Metal Thermocouples
ASME B46.1 : 2009 SURFACE TEXTURE (SURFACE ROUGHNESS, WAVINESS, AND LAY)
ASTM E 780 : 2017 : REDLINE Standard Test Method for Measuring the Insulation Resistance of Mineral-Insulated, Metal-Sheathed Thermocouples and Mineral-Insulated, Metal-Sheathed Cable at Room Temperature
ASTM E 344 : 2016-12 TERMINOLOGY RELATING TO THERMOMETRY AND HYDROMETRY
ASTM E 220 : 2013 : REDLINE Standard Test Method for Calibration of Thermocouples By Comparison Techniques
AWS A5.9 : 93(R1999) BARE STAINLESS STEEL WELDING ELECTRODES AND RODS, SPECIFICATION FOR

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