TEMPERATURE SENSORS -
THERMOCOUPLES
types of THERMOCOUPLES
One of the factors to consider when choosing metals used in a thermocouple is the temperature range of the application. Common thermocouple types include:
- Type K: Chromel (nickel-chromium alloy) and Alumel (nickel-aluminum alloy). This type is widely used and covers a broad temperature range.
- Type J: Iron and Constantan (copper-nickel alloy). It has a more limited temperature range but lower cost compared to type K.
- Type T: Copper and Constantan. It is popular for low-temperature applications.
- Type E: Chromel and Constantan. It has the highest sensitivity and it suitable for moderate-temperature applications.
thermocouple Temperature Sensor Tables in °C and °F
- Type E temperature tables
- Type J temperature tables
- Type K temperature tables
- Type T temperature tables
summary of thermocouple types and common applications
Thermocouple type | Positive leg alloy / color | Negative leg alloy / color | Temp Range (°C) | Common Applications | Notes |
Type K
| Chromel (Ni-Cr) / Yellow | Alumel (Ni-Al) / Red | -200 to +1250 | Industrial processes, nuclear, aerospace | Highest temperature range |
Type J
| Iron / White | Constantan (Cu-Ni) / Red | 0 to +750 | Plastic manufacture, vacuum processes | Lowest cost |
Type T
| Copper / Blue | Constantan (Cu-Ni) / Red | -200 to +350 | Cryogenics, food industry, environmental monitoring | Sub-zero |
Type E
| Chromel (Ni-Cr) / Purple | Constantan (Cu-Ni) / Red | -200 to +900 | Chemical industry | Highest sensitivity |
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