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ASTM E601-07

Historical Revision

Standard Guide for Measuring Electromotive Force (EMF) Stability of Base-Metal Thermoelement Materials With Time in Air

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1.1 This test method measures emf stability of base-metal thermoelement materials in air referenced to platinum at specified constant elevated temperatures using dual, simultaneous, emf indicators, or using a single emf indicator, with the test and reference emf measured alternately. This test is conducted over a period of weeks.

1.2 A calibrated platinum-rhodium/platinum thermocouple is used as a reference standard to establish the test temperature.

1.3 The useful life of a thermocouple depends on the stability of the emf generated at given temperatures for a required time interval. This method provides a quantitative measure of the stability of individual thermoelements. By combining the results of the positive (P) and negative (N) thermoelements, the stability of a thermocouple comprised of both P and N thermoelements may be obtained. The emf of an individual thermoelement is measured against platinum, which may be the platinum leg of the platinum-rhodium/platinum reference thermocouple, or an additional platinum reference.

Note 1

Some thermoelements may show insignificant emf drift while undergoing relatively rapid oxidation. In these cases, failure of the thermoelement may be indicated only by a large rise in the electrical resistance of the thermocouple, as measured between the reference junctions.

Note 2

See ASTM MNL 12 for recommended upper temperature limits in air.

Note 3

This test method is only applicable for initially new thermoelements. Base-metal thermoelements exposed to temperatures above 200 °C become thermoelectrically inhomogeneous, and stability testing of inhomogeneous thermoelements will give ambiguous results.

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.


SDO ASTM: ASTM International
Document Number E601
Publication Date May 1, 2007
Language en - English
Page Count 7
Revision Level 07
Supercedes
Committee E20.04
Publish Date Document Id Type View
Nov. 1, 2020 E0601-20 Revision
May 1, 2015 E0601-15 Revision
Nov. 1, 2007 E0601-07A Revision
May 1, 2007 E0601-07E01 Revision
May 1, 2007 E0601-07 Revision
Jan. 1, 1997 E0601-81R97 Revision
May 1, 2013 E0601-07AR13 Reaffirmation