The R -type thermocouple temperature sensor (Platinum is relatively 13%/platinum) and can use up to 1480 ° C (2,700 ° F).
 
They are very stable, but the restore atmosphere is particularly destructive. This type should protect the gas -density ceramic tube and the second tube of alumina, aluminum porcelain, silicon carbide, or metal external tube. The R -type thermocouple temperature sensor can output 15% more than the S -type thermocouple temperature sensor.
 
The use of precious metals is usually used for high temperature measurement and control, especially for temperatures of 1093 ° C (2000 ° F) and above. The R -type thermoelectric puppet temperature sensor covers a similar application of the S -type thermocouple temperature sensor, but it provides improved stability and marginal increase range. Therefore, the R -type thermocouple temperature sensor tends to be used priority to the S -type thermocouple temperature sensor.
 
Generally speaking, the combined thermocouple used by platinum and platinum alloy, gold or crickets is considered the most copy of all types of all types. They are antioxidant in the air and can use very high temperatures due to their high melting points.
Typical applications of types are: heat treatment and control sensor, semiconductor industry, glass manufacturing, black metal and non -ferrous metals.
 
The precious metal sensor is very expensive. Elemental hydrogen, sulfur, and other atomic pollutants must be excluded from the R type. If these pollutants are not completely excluded, the failure of major calibration drift, brittleness, and thermocouple wires will occur. In addition, some elements must be excluded as a catalyst, and the thermoelectric puppet line must be excluded.
 
Low sensitivity and high costs make them unsuitable for general uses.