RTD Tolerances, Classes and Comparisons
Platinum RTD Tolerance Values
| Temperature °C | Resistance Value Ω | Tolerance DIN-IEC-751 | |
|---|---|---|---|
| Class A °C (Ω) |
Class B °C (Ω) |
||
| -200 -100 0 100 200 |
18.52 60.26 100.00 138.51 175.86 |
±0.55-(±0.24) ±0.35-(±0.14) ±0.15-(±0.06) ±0.35-(±0.13) ±0.55-(±0.20) |
±1.3-(±0.56) ±0.8-(±0.32) ±0.3-(±0.12) ±0.8-(±0.30) ±1.3-(±0.48) |
| 300 400 500 600 650 |
212.05 247.09 280.98 313.71 329.64 |
±0.75-(±0.27) ±0.95-(±0.33) ±1.15-(±0.38) ±1.35-(±0.43) ±1.45-(±0.46) |
±1.8-(±0.64) ±2.3-(±0.79) ±2.8-(±0.93) ±3.3-(±1.06) ±3.6-(±1.13) |
RTD Tolerance Class Definitions
DIN class A: ± [ (0.15 + 0.002 | t | ] °C
DIN class B: ± [ (0.30 + 0.005 | t | ] °C
RTD Resistance Wire Comparisons
| Element Metal | Temperature Range | Benefits | Base Resistance | TCR (Ω/Ω/°C) |
|---|---|---|---|---|
| Platinum | -260 to 850°C (-436 to 1562°F) |
Best stability, good linearity | 100 Ω at 0°C | 0.00385 (DIN-IEC-761), 0.003916 (JIS 1604-1981) |
| Copper | -100 to 260°C (-148 to 500°F) |
Best linearity | 10 Ω at 25°C | 0.00427 |
| Nickel | -100 to 260°C (-148 to 500°F) |
Low cost, High Sensitivity | 120 Ω at 0° C | 0.00672 |