Platinum Thermocouples

Equipment and Measuring Devices

Product image of Platinum Thermocouples

Platinum Thermocouples

Widely acclaimed for reliability with established technology

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

(+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


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, we have improved the platinum to achieve equal or better creep strength than that of a positive electrode at high temperatures.

[Graph of thermoelectromotive force in type R thermocouples]  TEMPLAT and Original Pure Pt
Thermoelectromotive force in type R thermocouples

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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