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    Thermocouple Materials

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    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 ASA C96.1-1964. This section covers general application data on the atmospheres in which each thermocouple type can be used, recommended temperature ranges, limitations, etc. Physical and thermoelectric properties of the thermoelement materials used in each of these thermocouple types are tabulated in Section 3.1.2. The following thermocouple types are included (these are defined as having the emf-temperature relationship given in the corresponding letter-designated Table in Section 10. within the limits of error specified in Table 41 of that section): Type T—Copper (+) Constantan (−) Type J—Iron (+) Constantan (−) Type K—Originally Chromel (+) Alumel (−) Type E—Originally Chromel (+) Constantan (−) Type R—Platinum/13% Rhodium (+) versus Platinum (−) Type S—Platinum/10% Rhodium (+) versus Platinum (−) Type B—Platinum/30% Rhodium (+) versus Platinum/6% Rhodium (−) Temperature limits stated in the text are maximum values. Table 2 gives recommended maximum temperature limits for various gage sizes of wire. Table 3 gives nominal Seebeck coefficients for the various types. Temperature-emf equivalents and commercial limits of error for these common thermocouple types are given in Section 10.

    Committee/Subcommittee: E20.01

    DOI: 10.1520/STP46139S