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Description of ASTM-E235 1996ASTM E235-88-e1-Reapproved1996Historical Standard: Standard Specification for Thermocouples, Sheathed, Type K, for Nuclear or for Other High-Reliability ApplicationsASTM E235Scope 1.1 Intent- This specification presents the requirements for sheathed, Type K thermocouples for nuclear 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 specifically to detail requirements for using this type of sheathed thermocouple in nuclear environments. This specification can be used for sheathed thermocouples which are required for laboratory or general commercial applications where the environmental conditions exceed normal service requirements. The intended use of a sheathed thermocouple in a specific nuclear application will require evaluation, by the purchaser, 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. 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 for sheathing, magnesium oxide or aluminum oxide as insulation, and Type K thermocouple wires for thermoelements (see Note 2). 1.2 General Design- Nominal sizes of the finished thermocouples shall be 0.0400 in. (1.016 mm), 0.0625 in. (1.588 mm), 0.1875 in. (4.763 mm), 0.125 in. (3.175 mm), or 0.250 in. (6.350 mm). Sheath dimensions and tolerances for each nominal size shall be in accordance with Table 1. The classes of thermocouples covered by this specification are as follows: 1.2.1 Class 1- Measuring junction grounded to sheath, and 1.2.2 Class 2- Measuring junction not grounded to sheath (insulated junction). 1.2.3 See Figs. 1 and 2 and Table 1 for details. Note 1-The values stated in inch-pound units are to be regarded as the standard.Keywords grounded junction; high-reliability thermocouple; insulated junction; metal-sheathed; mineral insulated; thermocouple ICS Code ICS Number Code 17.200.20 (Temperature-measuring instruments) DOI: 10.1520/E0235-88R96E01 This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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