Thermocouple Type | Material | Magnetic | ASTM Color Coding | IEC Color Coding |
J | Iron Constantan | Yes No |
White Red |
White Black |
T | Copper Constantan | No No |
Blue Red |
White Brown |
K | Chromel Alumel | No No |
Yellow Red |
White Green |
E | Chromel/Constantan | No No |
Purple Red |
White Violet |
P | Platinel | N/A | N/A | N/A |
S | Platinum 10% Rhodium Pure Platinum | No No |
Black Red |
White Orange |
R | Platinum 13% Rhodium Pure Platinum | No No |
Black Red |
white Orange |
B | Platinum 30% Rhodium Platinum 6% Rhodium | No No |
Grey Red |
White Grey |
N | Nicrosil/Nisil | No Slightly |
Orange Red |
White Pink |
C | Tungsten 5% Rhenium/ Tungsten 26% Rhenium | No No |
White Red |
N/A |
Material | Description | Used With | Maximum Temperature |
Alumina | Aluminum Oxide Ceramic | Noble Metal Thermocouples | 3400°F (1870°C) |
Mullite | Alumina and Silica (Silicon Carbide) | Base Metal Thermocouples | 3100°F (1700°C) |