The temperature-versus-voltage relationship of a the thermocouple is not linear.
You can reference the thermocouple reference tables to get V to T values. Or
use temperature conversion equation to get V to T values.
Temperature Conversion Equation:
T = a0 + a1 x + a2 x^2 + a3 x^3 + a4 x^4 + …….. + an x^n
where
T = Temperature
x = Thermocouple Voltage
a = Polynomial coefficients unique to each thermocouple
n = Maximum order of the polynomial
TYPE E TYPE J TYPE K TYPE R TYPE S TYPE T
-100°C to 1000°C 0°C to 760°C 0°C to 1370°C0°C to 1000°C0°C to 1750°C -160°C to 400°C
0.104967248 -0.048868252 0.226584602 0.263632917 0.927763167 0.100860910
17189.45282 19873.14503 24152.10900 179075.491 169526.5150 25727.94369
-282639.0850 -218614.5353 67233.4248 -48840341.37 -31568363.94 -767345.8295
12695339.5 11569199.78 2210340.682 1.90002E+10 8990730663 78025595.81
-448703084.6 -264917531.4 -860963914.9 -4.82704E+12 -1.63565E+12 -9247486589
1.10866E+10 2018441314 4.835606E+10 7.62091E+14 1.88027E+14 6.97688E+11
-1.76807E+11 -1.18452E+12 -7.20026E+16 -1.37241E+16 -2.66192E+13
1.71842E+12 1.38690E+13 3.71496E+18 6.17501E+17 3.94078E+14
-9.19278E+12 -6.33708E+13 -8.03104E+19 -1.56105E+19
2.06132E+13 1.69535E+20
a0
a1
a2
a3
a4
a5
a6
a7
a8
a9
Note:
1. The thermocouple range of this table is this equation limited.
2. Other detail data please reference thermocouple data book.
OME-DB-889D User’s Manual
13