Active standard | Published: 01/07/2023

ASTM E235/E235M-23

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

Available languages: English

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Detail information

Designation: ASTM E235/E235M-23

Publication date: 01/07/2023

Pages: 6

Country: American technical standard

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Anotation

This specification covers the requirements for sheathed, Type K and N thermocouples for nuclear service. 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 measuring junction styles for thermocouples are as follows: Style G2 (grounded) in which measuring junction is electrically connected to conductive sheaths and Style U2 (ungrounded) in which measuring junctions are electrically isolated from conductive sheaths and from reference ground. Different properties of the sheath such as integrity, cracks, voids, inclusions, surface finish, surface defect, and metallurgical structure shall be determined by performing different tests. Insulation resistance between thermoelements and the sheath shall be measured as well.

Keywords:
grounded junction, high-reliability thermocouple, metal-sheathed, mineral insulated, thermocouple, ungrounded junction,, ICS Number Code 17.200.20 (Temperature-measuring instruments)

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