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Every application is different, which is why thermocouple manufacturers produce a wide variety of thermocouple types to match the specific needs of each business. Different considerations, such as overall operating temperature and environment, will impact exactly which type of thermocouples you need, as some will be much more viable than others.

Of course, it’s easy to choose if you know every type of thermocouple by heart. That’s why we’re putting together a quick rundown of different thermocouple types to help you decide which one is right for your applications, including the Type K thermocouple.


Like Type J thermocouples, the Type K option is a very common general-purpose solution for a variety of applications. They are a nickel alloy thermocouple and are made with chromel and alumel. Type K thermocouples have a recommended usage range of -454 to 2,300 degrees Fahrenheit, although they’re typically used for environments and applications above 1,000 degrees.

While Type K thermocouples are very popular, there are some environments that they should be avoided. While these thermocouples generally well-suited for oxidizing atmospheres, the chromel element does not mix well with reduced oxygen environments around 1,500 to 1,900 degrees Fahrenheit. This is because chromel is subject to “green rot” in these conditions, which corrodes the non-magnetic chromel wire and even causes it to become magnetic. These thermocouples also should be avoided for long-term use in vacuums, as chromium may cause vaporization.


Aside from a few specific environmental restrictions, Type K thermocouples are a great option for many different applications due to their reliability, versatility, and cost-effectiveness. 

Whether you need quality Type K thermocouples or some other type of sensor, GeoCorp can help. Contact us today to talk to a GeoCorp expert about your thermocouple needs. 

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