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The two wires that make up the thermocouple pair are made from a range of different alloys and metals and have been standardised by both international and national bodies.
Thermocouple wire type K is a type of thermocouple wire commonly used in temperature measurement applications. It is made up of a combination of two different metals, chromel and alumel, which generate a voltage when exposed to a temperature difference.
Type K thermocouples are known for their wide temperature range (-200°C to 1350°C) and high accuracy, making them suitable for use in a variety of industries such as manufacturing, automotive, and aerospace.
What differentiates one thermocouple from another is the metals in its two wires: the positive leg and the negative leg. Because each thermocouple type has a different pairing, they differ in temperature limits, process conditions (inert, oxidizing, reducing atmospheres, heavy vibration), and so on.
|
Conductor Name |
Thermocouple Type | Grade |
Temperature range ℃ | Allowable Tolerance /℃ |
| PtRh30-PtRh6 | B | Ⅱ | 600~1700 | ±0.25% t |
| Ⅲ | 600~800 | ±4 | ||
| 800~1700 | ±0.5%t | |||
| PtRh13-Pt | R | Ⅰ | 0~1100 | ±1 |
| 1100~1600 | ±[1+(t－1100) ×0.3％] | |||
| Ⅱ | 0~600 | ±1.5 | ||
| 600~1600 | ±0.25% t | |||
| PtRh10-Pt | S |
Ⅰ | 0~1100 | ±1 |
| 1100~1600 | ±[1+(t－1100) ×0.3％] | |||
|
Ⅱ | 0~600 | ±1.5 | ||
| 600~1600 | ±0.25% t | |||
| NiCr-Ni | K | Ⅰ | -40~1100 | ±1.5℃ or ±0.4%t |
| Ⅱ | -40~1300 | ±2.5℃ or ±0.75%t | ||
| Ⅲ | -200~40 | ±2.5℃ or ±1.5%t | ||
| NiCrSi-NiSi | N | Ⅰ | -40~1100 | ±1.5℃ or ±0.4%t |
| Ⅱ | -40~1300 | ±2.5℃ or ±0.75%t | ||
| Ⅲ | -200~40 | ±2.5℃ or ±1.5%t | ||
| NiCr-CuNi (Constantan) | E | Ⅰ | -40~1100 | ±1.5℃ or ±0.4%t |
| Ⅱ | -40~1300 | ±2.5℃ or ±0.75%t | ||
| Ⅲ | -200~40 | ±2.5℃ or ±1.5%t | ||
| Fe-CuNi (Constantan) | J | Ⅰ | -40~750 | ±1.5℃ or ±0.4%t |
| Ⅱ | -40~750 | ±2.5℃ or ±0.75%t | ||
| Cu-CuNi (Constantan) | T | Ⅰ | -40~350 | ±0.5℃ or ±0.4%t |
| Ⅱ | -40~350 | ±1.0℃ or ±0.75%t | ||
| Ⅲ | -200~40 | ±1.0℃ or ±1.5%t |
