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ASTM E 601 : 2020

Current

Current

The latest, up-to-date edition.

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

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

24-12-2020

€56.53
Excluding VAT

Committee
E 20
DocumentType
Guide
Pages
7
PublisherName
American Society for Testing and Materials
Status
Current
Supersedes

1.1This guide provides a method for measuring the 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 MNL12 for recommended upper temperature limits in air.2

Note 3:This guide is only applicable for initially new unused 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM E 344 : 2020 Terminology Relating to Thermometry and Hydrometry

ASTM E 1159 : 1998 Standard Specification for Thermocouple Materials, Platinum-Rhodium Alloys, and Platinum
ASTM E 563 : 1997 Standard Practice for Preparation and Use of an Ice-Point Bath as a Reference Temperature
ASTM E 230/E230M : 2017 Standard Specification for Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples
ASTM E 220 : 2019 Standard Test Method for Calibration of Thermocouples By Comparison Techniques
ASTM E 344 : 2023 Terminology Relating to Thermometry and Hydrometry
ASTM E 344 : 2018 Terminology Relating to Thermometry and Hydrometry
ASTM E 230/E230M : 2023 Standard Specification for Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples
ASTM E 344 : 2001 : REV A Terminology Relating to Thermometry and Hydrometry
ASTM E 563 : 2022 Standard Practice for Preparation and Use of an Ice-Point Bath as a Reference Temperature
ASTM E 1159 : 2015 : R2020 : EDT 1 Standard Specification for Thermocouple Materials, Platinum-Rhodium Alloys, and Platinum
ASTM E 230/E230M : 2023 : REV A Standard Specification for Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples
ASTM E 563 : 2011 : R2016 Standard Practice for Preparation and Use of an Ice-Point Bath as a Reference Temperature

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