![]() The use of the letter X to indiate thermocouple extension wire appeared obvious." ![]() 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. "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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