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.
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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 |