Thermocouple device
AssigneeKabushiki Kaisha Toshiba
InventorMasaru Itoyama
Life of this patent
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Abstract
A thermocouple device for detecting a flame. The device includes an outer thermocouple element having an excellent corrosion resistance and a large thermoelectromotive force, an inner thermocouple element, which is inserted into the outer thermocouple element, having a large thermoelectromotive force, and a junction layer securing end portions of the inner and outer thermocouple element. The junction layer is formed with a soldering material so as to avoid the formation of an alloy of the element materials that would have a poor corrosion resistance normally formed by welding.
Claims3
A thermocouple device comprising:
- an outer thermocouple element having a hollow first end portion, said outer thermocouple element being made of a Fe-Cr-Ni alloy;
- an inner thermocouple element a first end portion fitted within the hollow first end portion of the outer thermocouple element, said inner thermocouple element being made of constantan;
- and
- a solder layer securing the respective first end portions of the inner and outer thermocouple elements to one another, said solder layer being an alloy having 14% by weight Pt, 3% by weight Au and the balance Pd.
A thermocouple device comprising:
- an outer thermocouple element having a hollow first end portion, said outer thermocouple element being made of a Fe-Cr-Ni alloy;
- an inner thermocouple element having a first end portion fitted within the hollow first end portion of the outer thermocouple element, said inner thermocouple element being made of constantan;
- and
- a solder layer securing the respective first end portions of the inner and outer thermocouple elements to one another, said solder layer being an alloy having 31% by weight Pt, 14% by weight Au and the balance Pd.
A thermocouple device comprising:
- an outer thermocouple element having a hollow first end portion, said outer thermocouple element being made of a Fe-Cr-Ni alloy;
- an inner thermocouple element having a first end portion fitted within the hollow first end portion of the outer thermocouple element, said inner thermocouple element being made of constantan;
- and
- a solder layer securing the respective first end portions of the inner and outer thermocouple elements to one another, said solder layer being an alloy having 35% by weight Pd and the balance Au.
Dependencies are inferred from the claim text.