The error shown in the table below shows the conversion error using the voltage-temperature conversion formula, not the error of NLTP temperature measurement.
Since the calculation error is the smallest, especially between -20 and 110 ° C, the calculation error is 0, so Eq.A is recommended when measuring the temperature in the natural environment.
Assuming -20 to 50 ° C as the normal range for temperature measurement, the average temperature coefficient in that range is -0.1939 ° C / mV. If you want to perform simpler operations, please use Eq.B.

Eq.A: Temp (℃) = -0.000000001809628*(mV)^3-0.000003325395*(mV)^2-0.1814103*(mV)+205.5894

Eq.B: Temp (℃) = -0.1939*(mV)+212.81

3rd Conversion Error Table (EqA)

Vtao(mV) True Temp (deg.) 3rd order transfer
(-55 to 110 deg.)
3rd Conversion Error (deg.)
1375.219 -55 -55.885 -0.115
1350.441 -50 -49.916 -0.084
1300.593 -40 -39.958 -0.042
1250.398 -30 -29.983 -0.017
1199.884 -20 -19.996 -0.004
1149.070 -10 -10.000 0.000
1097.987 0 -0.001 0.001
1046.647 10 9.999 0.001
995.050 20 20.002 -0.002
943.227 30 30.001 0.001
891.178 40 39.999 0.001
838.882 50 49.999 0.001
786.360 60 59.999 0.001
733.608 70 70.001 -0.001
680.654 80 80.000 0.000
627.490 90 90.000 0.000
574.117 100 100.000 0.000
520.551 110 110.000 0.000

1st Conversion Error Table (EqB)

Vtao(mV) True Temp (deg.) 1st order transfer
(-55 to 110 deg.)
1st Conversion Error (deg.)
1375.219 -55 -53.845 -1.115
1350.441 -50 -49.041 -0.959
1300.593 -40 -39.375 -0.625
1250.398 -30 -29.642 -0.358
1199.884 -20 -19.848 -0.152
1149.070 -10 -9.995 -0.005
1097.987 0 -0.090 0.090
1046.647 10 9.865 0.135
995.050 20 19.870 0.130
943.227 30 29.918 0.082
891.178 40 40.011 -0.011
838.882 50 50.151 -0.151
786.360 60 60.335 -0.335
733.608 70 70.563 -0.563
680.654 80 80.831 -0.831
627.490 90 91.140 -1.140
574.117 100 101.489 -1.489
520.551 110 111.875 -1.875