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%