How accurate is a RTD sensor? (Pt100) (classes A, B, 1/3DIN, etc)

Based on IEC 60751:2008 we can define 4 different classes for resistance temperature detectors. Below you can find an overview of the different classes in sequence based on accuracy:

Class 1/10 DIN B
Class 1/10 DIN B Pt100 sensors have a resistance of 100 ohms at 0°C with a tolerance of ±0.03 °C.

Class 1/3 DIN B
Class 1/3 DIN B Pt100 sensors have a resistance of 100 ohms at 0°C with a tolerance of ±0.80 °C.

Class A
Class A Pt100 sensors have a resistance of 100 ohms at 0°C with a tolerance of ±0.15 °C

Class B
Class B Pt100 sensors have a resistance of 100 ohms at 0°C with a tolerance of ±0.30 °C

Accuracy for Thin Film

In the below chart you can find accuracy levels based on class for thin films.

ACTUALClass BClass A1/3 DIN
-70 °C0.65 °C  
-60 °C0.60 °C  
-50 °C0.55 °C0.28 °C 
-40 °C0.50 °C0.25 °C 
-30 °C0.45 °C0.23 °C 
-20 °C0.40 °C0.20 °C 
-10 °C0.37 °C0.19 °C 
0 °C0.30 °C0.15 °C0.10 °C
10 °C0.35 °C0.18 °C0.12 °C
20 °C0.40 °C0.20 °C0.13 °C
30 °C0.45 °C0.23 °C0.15 °C
40 °C0.50 °C0.25 °C0.17 °C
50 °C0.55 °C0.28 °C0.18 °C
60 °C0.60 °C0.30 °C0.20 °C
70 °C0.65 °C0.33 °C0.22 °C
80 °C0.70 °C0.35 °C0.23 °C
90 °C0.75 °C0.38 °C0.25 °C
100 °C0.80 °C0.40 °C0.27 °C
110 °C0.85 °C0.43 °C0.28 °C
120 °C0.90 °C0.45 °C0.30 °C
130 °C0.95 °C0.48 °C0.32 °C
140 °C1.00 °C0.50 °C0.33 °C
150 °C1.05 °C0.53 °C0.35 °C
160 °C1.10 °C0.55 °C 
170 °C1.15 °C0.58 °C 
180 °C1.20 °C0.60 °C 
190 °C1.25 °C0.63 °C 
200 °C1.30 °C0.65 °C 
250 °C1.55 °C0.78 °C
300 °C1.80 °C0.90 °C
350 °C2.05 °C
400 °C2.30 °C
450 °C2.55 °C

Accuracy for Ceramic Wire Wound

In the below chart you can find accuracy levels based on class for ceramic wire wounds.

ACTUALClass BClass A1/3 DIN1/10 DIN
-200 °C1.30 °C   
-150 °C1.05 °C   
-100 °C0.80 °C0.40 °C0.27 °C0.08 °C
-90 °C0.75 °C0.38 °C0.25 °C0.08 °C
-80 °C0.70 °C0.35 °C0.23 °C0.07 °C
-70 °C0.65 °C0.33 °C0.22 °C0.07 °C
-60 °C0.60 °C0.30 °C0.20 °C0.06 °C
-50 °C0.55 °C0.28 °C0.18 °C0.06 °C
-40 °C0.50 °C0.25 °C0.17 °C0.05 °C
-30 °C0.45 °C0.23 °C0.15 °C0.05 °C
-20 °C0.40 °C0.20 °C0.13 °C0.04 °C
-10 °C0.37 °C0.19 °C0.12 °C0.04 °C
0 °C0.30 °C0.15 °C0.10 °C0.03 °C
10 °C0.35 °C0.18 °C0.12 °C0.04 °C
20 °C0.40 °C0.20 °C0.13 °C0.04 °C
30 °C0.45 °C0.23 °C0.15 °C0.05 °C
40 °C0.50 °C0.25 °C0.17 °C0.05 °C
50 °C0.55 °C0.28 °C0.18 °C0.06 °C
60 °C0.60 °C0.30 °C0.20 °C0.06 °C
70 °C0.65 °C0.33 °C0.22 °C0.07 °C
80 °C0.70 °C0.35 °C0.23 °C0.07 °C
90 °C0.75 °C0.38 °C0.25 °C0.08 °C
100 °C0.80 °C0.40 °C0.27 °C0.08 °C
110 °C0.85 °C0.43 °C0.28 °C0.09 °C
120 °C0.90 °C0.45 °C0.30 °C0.09 °C
130 °C0.95 °C0.48 °C0.32 °C0.10 °C
140 °C1.00 °C0.50 °C0.33 °C0.10 °C
150 °C1.05 °C0.53 °C0.35 °C0.11 °C
160 °C1.10 °C0.55 °C0.37 °C0.11 °C
170 °C1.15 °C0.58 °C0.38 °C0.12 °C
180 °C1.20 °C0.60 °C0.40 °C0.12 °C
190 °C1.25 °C0.63 °C0.42 °C0.13 °C
200 °C1.30 °C0.65 °C0.43 °C0.13 °C
250 °C1.55 °C0.78 °C0.52 °C0.16 °C
300 °C1.80 °C0.90 °C0.60 °C0.18 °C
350 °C2.05 °C1.03 °C0.68 °C0.21 °C
400 °C2.30 °C1.15 °C
450 °C2.55 °C1.28 °C
500 °C2.80 °C
550 °C3.05 °C
600 °C3.30 °C
650 °C3.55 °C