Thermocouple Selection Criteria with Examples

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Here's a brief guide for the selection process among some commonly used thermocouple types: Type K, Type N, Type J, and Type E.
1. Type K (Chromel/Alumel):
Temperature Range: -200°C to 1,372°C (-328°F to 2,502°F)
Applications: Versatility defines the Type K thermocouple, making it a go-to choice across various industries. Its wide temperature range and durability make it suitable for diverse applications.
2. Type N (Nicrosil/Nisil):
Temperature Range: -200°C to 1,300°C (-328°F to 2,372°F)
Applications: With good resistance to oxidation, Type N is ideal for high-temperature environments. It finds application in industries where reliability in challenging conditions is paramount.
3. Type J (Iron/Constantan):
Temperature Range: -210°C to 1,204°C (-346°F to 2,199°F)
Applications: Type J thermocouples are a solid choice for various applications, though they are less corrosion-resistant than Type K. They are commonly employed in industrial processes and HVAC systems.
4. Type E (Chromel/Constantan):
Temperature Range: -270°C to 1,000°C (-454°F to 1,832°F)
Applications: Known for its high EMF in moderate temperatures, Type E thermocouples are suitable for applications requiring precision and stability.
When selecting a thermocouple, it's vital to consider factors such as the temperature range of the process, the chemical environment, and the required accuracy. Type K is often the default choice due to its versatility, but specific applications may demand the unique properties of other types.

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