Answer 5
a. The S, R, and B types of thermocouples are the noble-metal thermocouples, which have high oxidation and corrosion resistance.

b. The E-type thermocouple produces the highest electromagnetic frequency output; however, its use is limited to vacuum or mildly oxidizing or reducing atmospheres.

c. The K-type thermocouple is always recommended for a clean oxidizing environment.

d. The J-type thermocouple is normally used in reduced atmospheres.

e. In moist environments, the only useful thermocouple is the T type. However, the T type has a relatively limited temperature range (up to 750°F).

f. The C, D, and G types of thermocouples tolerate high temperatures, but have poor oxidation resistance. Therefore, they are used only in vacuum, hydrogen, or inert atmospheres.

Contributor: Rajanish Kamat

Published June 2003