Type J Thermocouple: The type J 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:

Working temperature of J Type Thermocouple is 32 to 1382F(0 to 750°C)

Extension wire, 32 to 392F (0 to 200C)

 

Type J Accuracy (whichever is greater):

Standard: +/- 2.2C or +/- .75%

Special Limits of Error: +/- 1.1C or 0.4%

 

Consideration for bare wire type J thermocouple applications:

The Type J Is Well Suited To Oxidizing Atmospheres

Type K Thermocouple (Nickel-Chromium / Nickel-Alumel): The type K is the most common type of thermocouple. It’s inexpensive, accurate, reliable, and has a wide temperature range. The type K is commonly found in nuclear applications because of its relative radiation hardness. Maximum continuous temperature is around 1,100C.

 

Type K Temperature Range:

Type K Thermocouple Grade WireThermocouple grade wire, –454 to 2,300F (–270 to 1260C)

Extension wire, 32 to 392F (0 to 200C)

 

Type K Accuracy (whichever is greater):

Standard: +/- 2.2C or +/- .75%

Special Limits of Error: +/- 1.1C or 0.4%

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. The type N has better repeatability between 572F to 932F (300C to 500C) compared to the type K.

 

Type N Temperature Range:

Maximum continuous operating temperature: up to 2,300F (1,260C)

Type N Thermocouple Grade WireShort term use: 2,336F (1,280C)

 

Extension wire, 32 to 392F (0 to 200C)

 

Type N Accuracy (whichever is greater):

Standard: +/- 2.2C or +/- .75%

Special Limits of Error: +/- 1.1C or 0.4%

Consideration for bare wire type E thermocouple applications:

The type N holds up better to oxidation at high temperatures when compared to the type K.

 

Type T Thermocouple (Copper/Constantan): The Type T is a very stable thermocouple and is often used in extremely low temperature applications such as cryogenics or ultra low freezers. It is found in other laboratory environments as well. 

 

Type T Temperature Range:

Working temperature of J Type thermocouple is 32 to 662F(0 to 350C)

Extension wire, 32 to 392F (0 to 200C)

 

Type T Accuracy (whichever is greater):

Standard: +/- 1.0C or +/- .75%

Special Limits of Error: +/- 0.5C or 0.4%

Consideration for bare wire type T thermocouple applications:

The Type T Is Well Suited To Oxidizing Atmospheres