Type J Thermocouple

A Type J thermocouple is a temperature sensor made from two different metals: iron and constantan (a copper-nickel alloy). When these metals are joined at one end and heated, they generate a small voltage that corresponds to the temperature difference between the junction and the other end. This voltage can be measured to determine the temperature. Type J thermocouples are particularly useful for measuring temperatures ranging from about -40 to 750 degrees Celsius (-40 to 1382 degrees Fahrenheit), making them suitable for various industrial and scientific applications. However, they can oxidize at high temperatures, which may limit their use.