Thermocouples are the simple, robust and inexpensive temperature sensors widely used in various processes and wide temperature ranges. It consists of two different metals, joined at their ends forming a closed circuit and which generates an electromotive force when the two junctions (T1 and T2) are kept at different temperatures.

Thermocouple Operation Diagram:

Thermocouples are available in various types or calibrations, so it is important to carefully select a thermocouple suitable for the specific application.

TypePositive ElementNegative ElementUsual Temperature RangeStandard Error Line (Choose Largest)Special Error Line (Choose Largest)
TCopperConstantan-200°C~0°C+/-1°C ou +/-1,5%–/–
TCopperConstantan0°C~370°C+/-1°C ou +/-0,75%+/-0,5°C ou +/-0,4%
JIronConstantan0°C~760°C+/-2,2°C ou +/-0,75%+/-1,1°C ou +/-0,4%
EChromelConstantan0°C~870°C+/-1,7°C ou +/- 0,5%+/-1,0°C ou +/-0,4%
KChromelAlumel0°C~1260°C+/-2,2°C ou +/- 0,75%+/-1,1°C ou +/-0,4%
NNicrosilNisil0°C~1260°C+/-2,2°C ou +/- 0,75%+/-1,1°C ou +/-0,4%
S90% Platinum / 10% RhodiumPt 100%0°C~1480°C+-1,5°C ou +/- 0,25%+/-0,6°C ou +/-0,1%
R87% Platinum / 13% RhodiumPt 100%0°C~1480°C+/- 1,5°C ou +/- 0,25%+/-0,6°C ou +/-0,1%
B70% Platinum / 30% Rhodium94% Platina / 06% Rhódio870°C~1700°C+/- 0,5%+/-0,25%