"NIST (National Institute of Standards and Technology) has published tables and equations that describe the voltage/temperature relationship. See PB93-190338, Temperature-Electromotive Force Reference Functions and Tables for the Letter-Designated Thermocouple Types Based on the ITS-90. NIST provides two forms of polynomials. The first provides voltage as a function of temperature, and the second provides temperature as a function of voltage. Both of these forms will be used in the procedure described here for doing a thermocouple temperature conversion."https://www.keysight.com/upload/cmc_upload/All/5306OSKR-MXD-5501-040107_2.htm?&&cc=HK&lc=eng
T = co + c1V + c2V2 + c3V3 + c4V4 + c5V5 + c6V6 + c7V7 + c8V8 + c9V9
c0 = 0
c1 = 2.508355 x 101
c2 = 7.860106 x 10-2
c3 = -2.503131 x 10-1
c4 = 8.315270 x 10-2
c5 = -1.228034 x 10-2
c6 = 9.804036 x 10-4
c7 = -4.413030 x 10-5
c8 = 1.057734 x 10-6
c9 = -1.052755 x 10-8