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ASTM E780-92(1998)

Historical Reaffirmation

Standard Test Method for Measuring the Insulation Resistance of Mineral-Insulated, Metal-Sheathed Thermocouples and Mineral-Insulated, Metal-Sheathed Cable at Room Temperature

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1.1 This test method covers the techniques and requirements for measuring the electrical insulation resistance at room temperature between the thermoelements and between each of the thermoelements and the metal sheath of compacted ceramic-insulated, sheathed thermocouple material. It may be used to measure the insulation resistance of bulk lengths of sheathed thermocouple material environmentally sealed at the time of manufacture. It may also be used for testing sheathed thermocouples with a Type U junction. This test method cannot be used for sheathed thermocouples with a Type G junction unless the junction is removed, prior to testing.

1.2 This test method applies to the testing of sheathed thermocouple materials that are suitable for use in air. It is also applicable for sheathed thermocouple materials whose sheath or thermoelements are composed of refractory metals and are tested in a dry and nonreactive environment.

1.3 This test method may be used for sheathed thermocouple material having an outside diameter of 1.0 mm or larger.

1.4 Since the insulation resistance at room temperature of sheathed thermocouple materials may change during shipment, storage and use, the results obtained by this test method may not be the same as insulation resistance values determined at some later time.

1.5 This standard does not purport to address all of the safety problems, 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.


SDO ASTM: ASTM International
Document Number E780
Publication Date April 10, 1998
Language en - English
Page Count 4
Revision Level 92(1998)
Supercedes
Committee E20.04
Publish Date Document Id Type View
Jan. 15, 2017 E0780-17 Revision
May 1, 2006 E0780-06 Revision
Nov. 1, 2021 E0780-17R21 Reaffirmation
May 1, 2011 E0780-06R11 Reaffirmation
April 10, 1998 E0780-92R98 Reaffirmation