Watlow - RTD Tolerances, Classes and Comparisons

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RTD Tolerances, Classes and Comparisons

Platinum RTD Tolerance Values
Temperature °C	Resistance Value Ω	Tolerance DIN-IEC-751
Temperature °C	Resistance Value Ω	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

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