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ASTM E 601 : 2007 : REV A : R2013

ASTM E 601 : 2007 : REV A : R2013

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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Standard Test Method for Measuring Electromotive Force (emf) Stability of Base-Metal Thermoelement Materials with Time in Air

Available format(s)

Hardcopy , PDF

Superseded date

11-11-2014

Superseded by

ASTM E 601 : 2015

Language(s)

English

Published date

01-05-2013

Publisher

American Society for Testing and Materials

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Hardcopy - English
PDF - English
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Committee
E 20
DocumentType
Test Method
Pages
7
ProductNote
Reconfirmed 2013
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy
Supersedes

1.1This 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.

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

1.3The 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 between joined thermoelements, as measured at the reference junctions.
Note 2—See ASTM MNL 12 for recommended upper temperature limits in air.2
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.

1.4This 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.

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