Temperature - Electromotive Force (EMF) Tables for Non-Letter Designated Thermocouples 1 Table 19 ¾ Initial Limits of Error for Thermocouples           Temperature Range                    Tolerances-Reference Junction 0°C (32°F)         Standard Tolerances                          Special Tolerances Type          °C                         °F                              °C           °F                         °C              °F C 0 to 400 32 to 750 ±4.5 Note 1 n/a          Note 1 C 400 to 2315 750 to 4200 ±1.0 % n/a M -50 to 277 -58 to 530 ±2.2 ±1.1 M 277 to 1410 530 to 2570 ±0.75 % ±0.4 % P 0 to 1395 32 to 2543 ±1.0 % n/a Note 1 ¾ The Fahrenheit tolerance is 1.8 times larger than the °C tolerance at the equivalent °C temperature. Note particularly that percentage tolerance apply only to temperature that are expressed in °C Table 20 ¾ Recommended Upper Temperature Limits for Thermocouples Upper Temperature limit for Various Wire Gage Sizes (Awg). °C (°F) Type                    8 Gage                18 Gage               20 Gage      24 Gage               28 Gage C 2315 (4200) 2315 (4200) 2315 (4200) M 1260 (2300)A 1204 (2200)A P 1250 (2280) 1250 (2280) 1250 (2280) A Note that the upper temperature limits only apply in a protected sheath Page 1          This    reference    manual    consists    of    reference tables that give temperature-electromotive force (emf) relationships for Pyromation, Inc. Types C, M, and P thermocouples.  These are not ANSI reconized coded thermocouple types   These  tables  give  emf  values  to  three  decimal places (1 uV) for each degree of temperature.  Such tables are satisfactory for most industrial uses but may   not   be   adequate   for   computer   and   similar applications.      If   greater   precision   is   required,   the reader should contact the manufacturer for equations which   permit   easy   and   unique   generation   of   the temperature-emf relationship. 1 All  temperature   -   electromotive   force   data   in Tables   21   to   26   have   been   developed   from   wire manufacturers’ data.  The data in these tables are based upon the International Temperature Scale of 1990 (ITS-90). List of Tables Following is a list of the thermocouple tables included in this reference manual. Table Type        Range 19          Limits of error 20 Recommended upper temperature limits for protected thermocouples 21 C   W,5%Re - W,26%Re 0 to 2315 °C 22 C   W,5%Re - W,26%Re 32 to 4200 °F 23 M   Ni - Ni,18%Moly -50 to 1410 °C 24 M   Ni - Ni,18%Moly -58 to 2570 °F 25 P   Platinel II 0 to 1395 °C 26 P   Platinel II 32 to 2543 °F