Thermocouple Type j
Type J Thermocouple
(Iron-Constantan)
Type J thermocouple has the second highest EMF characteristics and is recommended for use in reducing, inert, oxidizing or vacuum atmospheres up to 750°C. Because of comparatively less expensive price, type J has been easily accepted for use in various applications. However, it should not be used in sulphurous atmospheres above 538°C due to formation of the sulfides that leads conductors to embrittlement. The iron element is often rusted under high humidity environment, therefore, type J is less desirable than type T for low temperature measurements.
