Type J thermocouple

Type J (iron–constantan) thermocouple has a more restricted range than type K (-40 to +750°C / -40 to 1382°F), but higher sensitivity of about 55 µV/°C. The Curie point of the iron (770°C / 1418°F) causes an abrupt change in the characteristic, which determines the upper temperature limit.


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Charles-Augustin de Coulomb

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