Type J) so letter designations were in use some years prior to the adoption of the standard. McElroy published by Oak Ridge National Lab (ORNL-2467), refers to T/Cs as Chromel P-Alumel (I.S.A Type K) or Iron-Constantan (I.S.A. This has been done primarily to eliminate the use of proprietary names." (page vi, ANSI MC96.1-1975)Ī mid 1950's report, "Progress Report I, Thermocouple Research Report for the Period Novemto October 31, 1957" by David L.
"In ANSI-MC96.1-1975 thermocouple and thermocouple extension wire are designated by letters. Single conductors pass the vertical flame test. The use of the letter X to indiate thermocouple extension wire appeared obvious." (a) See Standard Specifications section for temperature limits with. Cable passes ICEA 210,000 BTU/hr vertical tray flame test (Standard T-29-520). There are two common grades of thermocouple wire: measurement. These letters, which indicate standard combinations, were chosen arbitrarily, but with an effort to eliminate any confusion which might arise from the use of such general letter usage as AC, DC, G, etc., and differences which already exist between manufacturers. WR-TT wire conforms to Special Limits of Error Accuracy as defined by ASTM E230-ANSI MC 96.1. Unless you have explicit written permission, you may not reproduce, modify, rent, sell, distribute, transmit. "On the basis of general usage and NBS recognition, seven types of thermocouples, T, J, E, K, S, R, and B, have been coded. Mention of thermocouple letter designations is made in the forward to the MC96.1-1975 standard published in the 1980 "Standards and Practices for Instrumentation (6th Edition)". The "Manual on the Use of Thermocouples in Temperature Measurement", ASTM Special Technical Publication 470A, dated 1974 states, "The commonly used thermocouple types are identified by letter designations originally assigned by the Instrument Society of America (ISA) and adopted as an American Standard in ANSI C96.1-1964.".
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