NIST Temperature Scale Database (SRD 60), Version 3.0

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Thermocouple Data
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TypeCompositionTemperature Range (°C)
B Pt-30% Rh versus Pt-6% Rh 0 to 1820
E Ni-Cr alloy versus a Cu-Ni alloy -270 to 1000
J Fe versus a Cu-Ni alloy -210 to 1200
K Ni-Cr alloy versus Ni-Al alloy -270 to 1372
N Ni-Cr-Si alloy versus Ni-Si-Mg alloy -270 to 1300
R Pt-13% Rh versus Pt -50 to 1768
S Pt-10% Rh versus Pt -50 to 1768
T Cu versus a Cu-Ni alloy -270 to 400
Definitions and Format
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EMF for All Thermocouple Types
Coefficients of All Thermocouple Types
Reference Function Coefficients Definitions
The letter type, e.g., type T, identifies a specific temperature-voltage relationship, not a particular chemical composition. Thermocouples of a given type may have variations in composition as long as their resultant temperature-voltage relationships remain within specified tolerances.  All materials manufactured in compliance with the established thermoelectric voltage standards are equally acceptable.