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Type K (Chromel-Alumel):
The most common thermocouple, suitable for general use in oxidizing or inert atmospheres, with a temperature range of -200°C to +1300°C.
Positive Lead: Chromel (Nickel-Chromium alloy)
Negative Lead: Alumel (Nickel-Aluminum alloy)
Preferred for vacuum, reducing, or inert atmospheres, with a range of -40°C to +750°C.
Positive Lead: Iron
Negative Lead: Constantan (Copper-Nickel alloy)
Ideal for low-temperature applications in oxidizing, reducing, or inert atmospheres, functioning from -200°C to +350°C.
Positive Lead: Copper
Negative Lead: Constantan (Copper-Nickel alloy)
Features a high output and a temperature range of -50°C to +900°C, suitable for various environments.
Positive Lead: Chromel (Nickel-Chromium alloy)
Negative Lead: Constantan (Copper-Nickel alloy)
Similar to Type K but more stable and resistant to high-temperature oxidation, suitable for -270°C to +1300°C.
Positive Lead: Nicrosil (Nickel-Chromium-Silicon alloy)
Negative Lead: Nisil (Nickel-Silicon alloy)
These types are used for high-temperature applications, offering stability and resistance to oxidation in temperatures up to +1700°C for Type S and R, and up to +1800°C for Type B.
Positive Lead for Type S and R: Platinum-Rhodium alloy (Type S has 10% Rhodium, Type R has 13% Rhodium)
Negative Lead for Type S and R: Platinum
Positive Lead for Type B: Platinum-30% Rhodium
Negative Lead for Type B: Platinum-6% Rhodium
| Thermocouple Type |
Grade | Temperature range ºC |
Allowable Tolerance /ºC |
| Type B | 2 | 600~1700 | ±0.25% t |
| 3 | 600~800 | ±4 | |
| 800~1700 | ±0.5%t | ||
| Type R(S) | 1 | 0~1100 | ±1 |
| 1100~1600 | ±[1+(t-1100) ×0.3%] | ||
| 2 | 0~600 | ±1.5 | |
| 600~1600 | ±0.25% t | ||
| Type K and Type N | 1 | -40~1100 | ±1.5ºC or ±0.4%t |
| 2 | -40~1300 | ±2.5ºC or ±0.75%t | |
| 3 | -200~40 | ±2.5ºC or ±1.5%t | |
| Type E | 1 | -40~1100 | ±1.5ºC or ±0.4%t |
| 2 | -40~1300 | ±2.5ºC or ±0.75%t | |
| 3 | -200~40 | ±2.5ºC or ±1.5%t | |
| Type J | 1 | -40~750 | ±1.5ºC or ±0.4%t |
| 2 | -40~750 | ±2.5ºC or ±0.75%t | |
| Type T | 1 | -40~350 | ±0.5ºC or ±0.4%t |
| 2 | -40~350 | ±1.0ºC or ±0.75%t | |
| 3 | -200~40 | ±1.0ºC or ±1.5%t |
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