15_01_86 - STANDARD ITS-90 THERMOCOUPLE TABLES The...

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Unformatted text preview: STANDARD ITS-90 THERMOCOUPLE TABLES The Instrument Society of America (ISA) has assigned standard letter designations to a number of thermocouple types having specified emf-temperature relations. These designations and the approximate metal compositions which meet the required rela- tions, as well as the useful temperature ranges, are given below: Type B (Pt + 30% Rh) vs. (Pt + 6% Rh) 0 to 1820 C Type E (Ni + 10% Cr) vs. (Cu + 43% Ni) 270 to 1000 C Type J Fe vs. (Cu + 43% Ni) 210 to 1200 C Type K (Ni + 10% Cr) vs. (Ni + 2% Al + 2% Mn + 1% Si) 270 to 1372 C Type N (Ni + 14% Cr + 1.5% Si) vs. (Ni + 4.5% Si + 0.1% Mg) 270 to 1300 C Type R (Pt + 13% Rh) vs. Pt 50 to 1768 C Type S (Pt + 10% Rh) vs. Pt 50 to 1768 C Type T Cu vs. (Cu + 43% Ni) 270 to 400 C The compositions are given in weight percent, and the positive leg is listed first. It should be emphasized that the standard letter designations do not imply a precise composition but rather that the specified emf-temperature relation is satisfied. The first set of tables below lists, for each thermocouple type, the emf as a function of temperature on the International Temperature Scale of 1990 (ITS-90). The coefficients in the equation used to generate the table are also given. The second set of tables gives the inverse relationships, i.e., the coefficients in the polynomial equa- tion which expresses the temperature as a function of thermocou- ple emf. The accuracy of these equations is also stated. Further details and tables at closer intervals may be found in Reference 1. References 1. Burns, G. W., Seroger, M. G., Strouse, G. F., Croarkin, M. C., and Guthrie, W. F., Temperature-Electromotive Force Reference Functions and Tables for the Letter-Designated Thermocouple Types Based on the ITS-90 , Natl. Inst. Stand. Tech. (U.S.) Monogr. 175, 1993. 2. Schooley, J. F., Thermometry , CRC Press, Boca Raton, FL, 1986. Type B Thermocouples: emf-Temperature (C) Reference Table and Equations Thermocouple emf as a Function of Temperature in Degrees Celsius (ITS-90) emf in Millivolts Reference junctions at 0 C C 10 20 30 40 50 60 70 80 90 100 0.000 0.002 0.003 0.002 0.000 0.002 0.006 0.011 0.017 0.025 0.033 100 0.033 0.043 0.053 0.065 0.078 0.092 0.107 0.123 0.141 0.159 0.178 200 0.178 0.199 0.220 0.243 0.267 0.291 0.317 0.344 0.372 0.401 0.431 300 0.431 0.462 0.494 0.527 0.561 0.596 0.632 0.669 0.707 0.746 0.787 400 0.787 0.828 0.870 0.913 0.957 1.002 1.048 1.095 1.143 1.192 1.242 500 1.242 1.293 1.344 1.397 1.451 1.505 1.561 1.617 1.675 1.733 1.792 600 1.792 1.852 1.913 1.975 2.037 2.101 2.165 2.230 2.296 2.363 2.431 700 2.431 2.499 2.569 2.639 2.710 2.782 2.854 2.928 3.002 3.078 3.154 800 3.154 3.230 3.308 3.386 3.466 3.546 3.626 3.708 3.790 3.873 3.957 900 3.957 4.041 4.127 4.213 4.299 4.387 4.475 4.564 4.653 4.743 4.834 1000 4.834 4.926 5.018 5.111 5.205 5.299 5.394 5.489 5.585 5.682 5.780 1100 5.780 5.878 5.976 6.075 6.175 6.276 6.377 6.4786....
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This note was uploaded on 12/31/2011 for the course CHEMISTRY 101 taught by Professor Dr.dason during the Fall '08 term at Davenport.

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15_01_86 - STANDARD ITS-90 THERMOCOUPLE TABLES The...

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