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The thermocouple is a thermometer for measuring high temperatures that consists of an electrical circuit created by connecting two wires of different metals. It utilizes the voltage (thermoelectromotive force) created when there is a difference in temperature between the junction and base, calculating temperature from the strength of the voltage. Platinum thermocouples can be used in an oxidizing atmosphere of 1,000℃ or greater and are optimal for temperature control during steel, semiconductor and glass manufacture.

Thermocouple Types, Compositions, Operating Temperatures and Atmospheres

Constituent
symbols
Composition
(+ve, -ve)
Operating temperature
R PtRh13%, Pt Normal limit: 1,400℃, Overheating limit: 1,600℃  
S PtRh10%, Pt Normal limit: 1,400℃, Overheating limit: 1,600℃
B PtRh30%, PtRh6% Normal limit: 1,500℃, Overheating limit: 1,700℃

*Available with a desired wire diameter

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Temperature control sensors used in steel, glass, electrical, semiconductor, and chemical industries

As the negative electrode of pure platinum used in type R thermocouples has the disadvantage of easily fracturing at high temperatures, zirconium oxide was dispersed in platinum for the first time in the world, which creep strength of negative electrode at high temperature by ten-time of conventional ones.


Thermoelectromotive force in type R thermocouples


Initial stress and creep fracture time

This exhibits the same thermoelectromotive characteristics as the negative electrode of pure platinum currently in use, and can therefore be replaced conventional lines.

* The standard wire diameter is φ0.5, with class 2 precision.
For <φ0.5, the maximum length is 3m.
If you would like a different wire diameter or class 1 materials, please inquire separately.

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