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ASTM E1159 2015 Edition, December 1, 2015
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Standard Specification for Thermocouple Materials, Platinum-Rhodium Alloys, and Platinum
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This specification covers non-insulated platinumrhodium alloys (weight percent composition), and platinum thermoelements that meet the requirement of Specification E230 and NIST Monograph 175.2

This specification does not cover platinum and platinum-rhodium materials, that require a higher purity than specified in 5.1, such as used for temperature coefficient of resistance (TCR) measurements or standards type calibration. For requirements of this superior quality, it is suggested that suppliers of precious metals be contacted.

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.

2 “Temperature-Electromotive Force Reference Functions and Tables for the Letter-Designated Thermocouple Types Based on the ITS-90,” NIST Monograph 175 and Supplement 1. Available from NIST, U.S. Dept. of Commerce, Gaithersburg, MD 20899.