Thermocouple Types

/Thermocouple Types
Thermocouple Types 2017-09-30T08:27:16+00:00

Types of Thermocouples

thermocouple-temperature-curves-millivoltsThis chart shows each thermocouple type and its estimate millivolt output vs temperature. Note that the color codes on this page refer to the United States ANSI MC96.1 1982 colors, for international color codes refer to our color codes page.

Type K Thermocouple (Nickel Chromium / Nickel-Alumel)

type-k-thermocouple-grade-wire-extensionType K Thermocouple (Nickel-Chromium / Nickel-Alumel) is the most common type of thermocouple. It’s inexpensive, accurate, reliable, and has a wide temperature range.

 

Type K Temperature Range
Thermocouple Grade Wire –454°F to 2,300°F (–270°C to 1260°C)
Extension Wire 32°F to 392°F (0 to 200°C)

 

Type K Accuracy
Standard +/- 2.2°C or +/- .75%
Special Limits of Error +/- 1.1°C or 0.4%

 

pdf-download-35x35Download the ITS-90 Reference Table for Type K Thermocouples Here (PDF)

Type J Thermocouple (Iron/Constantan)

Type J Thermocouple (Iron/Constantan) is also very common. It has a smaller temperature range and a shorter lifespan at higher temperatures than the Type K. It is equivalent to the Type K in terms of expense and reliability.

Type J Temperature Range
Thermocouple Grade Wire –346°F to 1,400°F (–210°C to 760°C)
Extension Wire 32°F to 392°F (0 to 200°C)

 

Type J Accuracy
Standard +/- 2.2°C or +/- .75%
Special Limits of Error +/- 1.1°C or 0.4%

 

pdf-download-35x35Download the ITS-90 Reference Table for Type J Thermocouples Here (PDF)

Type T Thermocouple (Copper/Constantan)

Type T Thermocouple (Copper/Constantan) is a very stable thermocouple and is often used in extremely low temperature applications such as cryogenics or ultra low freezers.

 

Type T Temperature Range
Thermocouple Grade Wire –454°F to 700°F (–270°C to 370°C)
Extension Wire 32°F to 392°F (0 to 200°C)

 

Type T Accuracy
Standard +/- 1.0°C or +/- .75%
Special Limits of Error +/- 0.5°C or 0.4%

 

pdf-download-35x35Download the ITS-90 Reference Table for Type T Thermocouples Here (PDF)

Type E Thermocouple (Nickel-Chromium/Constantan)

The Type E has a stronger signal & higher accuracy than the Type K or Type J at moderate temperature ranges of 1,000°F and lower. See temperature chart (linked) for details.

 

Type T Temperature Range
Thermocouple Grade Wire –454°F to 1,600°F (–270°C to 870°C)
Extension Wire 32°F to 392°F (0 to 200°C)

 

Type T Accuracy
Standard +/- 1.7°C or +/- 0.5%
Special Limits of Error +/- 1.0°C or 0.4%

 

pdf-download-35x35Download the ITS-90 Reference Table for Type E Thermocouples Here (PDF)

Type N Thermocouple (Nicrosil/Nisil)

The Type N shares the same accuracy and temperature limits as the Type K. The type N is slightly more expensive.

 

Type N Temperature Range
Thermocouple Grade Wire –454°F to 2,300°F (–270°C to 1260°C)
Extension Wire 32°F to 392°F (0 to 200°C)

 

Type N Accuracy
Standard +/- 2.2°C or +/- 0.75%
Special Limits of Error +/- 1.1°C or 0.4%

 

pdf-download-35x35Download the ITS-90 Reference Table for Type N Thermocouples Here (PDF)

Noble Metal Thermocouples (Type S, R & B)

Noble Metal Thermocouples are selected for their ability to withstand extremely high temperatures while maintaining their accuracy and lifespan. They are considerably more expensive than Base Metal Thermocouples.

Type S Thermocouple (Platinum Rhodium 10%/Platinum)

The Type S is used in very high temperature applications. It is commonly found in the BioTech and Pharmaceutical industries. It is sometimes used in lower temperature applications because of its high accuracy and stability.

 

Type S Temperature Range
Thermocouple Grade Wire –58°F to 2,700°F (–50°C to 1480°C)
Extension Wire 32°F to 392°F (0 to 200°C)

 

Type S Accuracy
Standard +/- 1.5°C or +/- 0.25%
Special Limits of Error +/- 0.6°C or 0.1%

 

pdf-download-35x35Download the ITS-90 Reference Table for Type S Thermocouples Here (PDF)

Type R Thermocouple (Platinum Rhodium 13%/Platinum)

The Type R is used in very high temperature applications. It has a higher percentage of Rhodium than the Type S, which makes it more expensive. The Type R is very similar to the Type S in terms of performance. It is sometimes used in lower temperature applications because of its high accuracy and stability.

Type S Temperature Range
Thermocouple Grade Wire –58°F to 2,700°F (–50°C to 1480°C)
Extension Wire 32°F to 392°F (0 to 200°C)

 

Type S Accuracy
Standard +/- 1.5°C or +/- 0.25%
Special Limits of Error +/- 0.6°C or 0.1%

 

pdf-download-35x35Download the ITS-90 Reference Table for Type R Thermocouples Here (PDF)

Type B Thermocouple (Platinum Rhodium 30%/Platinum Rhodium 6%)

The Type B thermocouple is used in extremely high temperature applications. It has the highest temperature limit of all of the thermocouples listed above. It maintains a high level of accuracy and stability at very high temperatures.

 

Type B Temperature Range
Thermocouple Grade Wire 32°F to 3,100°F (0°C to 1,700°C)
Extension Wire 32°F to 212°F (0 to 100°C)

 

Type B Accuracy
Standard +/- 0.5%
Special Limits of Error +/- 0.25%

 

pdf-download-35x35Download the ITS-90 Reference Table for Type B Thermocouples Here (PDF)