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.
Tipo | Elemento Positivo | Elemento Negativo | Rango de temperatura habitual | Línea de error estándar (elija la más grande) | Línea de error especial (elija la más grande) |
---|---|---|---|---|---|
T | Cobre | Constantán | -200°C~0°C | +/-1°C ou +/-1,5% | –/– |
T | Cobre | Constantán | 0°C~370°C | +/-1°C ou +/-0,75% | +/-0,5°C ou +/-0,4% |
J | Hierro | Constantán | 0°C~760°C | +/-2,2°C ou +/-0,75% | +/-1,1°C ou +/-0,4% |
E | Cromel | Constantán | 0°C~870°C | +/-1,7°C ou +/- 0,5% | +/-1,0°C ou +/-0,4% |
K | Cromel | Alumel | 0°C~1260°C | +/-2,2°C ou +/- 0,75% | +/-1,1°C ou +/-0,4% |
N | Nicrosil | Nisil | 0°C~1260°C | +/-2,2°C ou +/- 0,75% | +/-1,1°C ou +/-0,4% |
S | 90% Platino / 10% Rodio | Pt 100% | 0°C~1480°C | +-1,5°C ou +/- 0,25% | +/-0,6°C ou +/-0,1% |
R | 87% Platino / 13% Rodio | Pt 100% | 0°C~1480°C | +/- 1,5°C ou +/- 0,25% | +/-0,6°C ou +/-0,1% |
B | 70% Platino / 30% Rodio | 94% Platino / 06% Rodio | 870°C~1700°C | +/- 0,5% | +/-0,25% |