Thermocouple Wire: Understanding Types K, T, & J

At Eustis/Pyrocom, we supply 502 Series thermocouple wires for temperature measurement applications in a wide range of industries. Each type features unique temperature ranges and material composition. By understanding the characteristics of each thermocouple wire type, you can identify the right wire for your application.

Type K Thermocouple Wire

Type K is the most common type of thermocouple wire due to its exceptional versatility and broad temperature range. It is comprised of a positive Nickel-Chromium alloy leg and a negative Nickel-Aluminum leg. Type K's versatility makes it a popular option across many industries.

• Widest temperature range: -200°C to 1250°C (-328°F to 2282°F)
• Most common type due to its versatility
• Good for high-temperature applications

Type T Thermocouple Wire

Type T thermocouple wire features excellent performance at low temperatures, making it a popular choice for industrial freezers and other low-temperature applications. It consists of a positive Pure Copper leg and a negative Constantan leg. Type T is also more precise than other thermocouples, ideal for applications requiring close temperature control.

• Medium temperature range: -250°C to 350°C (-418°F to 662°F)
• Often used for freezers and other low-temperature applications
• Provides very accurate temperature readings
• Lower cost than Type K

Type J Thermocouple Wire

Type J thermocouple wire is comprised of two conductors: one made of copper and nickel (-) and one made of iron (+). Type J is the most cost-friendly option of the three, though it does not have as wide of a temperature range as Type T and Type K.

• Limited temperature range: -0°C to 760°C (32°F to 1400°F)
• Affordable option
• Not ideal for very high temperatures or oxidizing environments
• Often used in plastic and resin manufacturing applications

Which 502 Series PVC Thermocouple Wire is Right for Your Application?

Choosing the proper thermocouple wire depends on your specific application's environment. It is important to know the temperature ranges, chemical exposure, and other factors that will be involved. To learn more, contact our team of thermocouple experts, and we’ll help you choose the right thermocouple wire for your needs. We’ll supply you with the proper type in the lengths suitable for your application. For pricing information on your order, request a quote online. Eustis/Pyrocom is your trusted manufacturer and supplier for thermocouple wire and other industrial temperature measurement resources.