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What is the difference between R and S type thermocouples?

The R and S type thermocouples are both made of platinum / rhodium wires. The R type has 13% rhodium / 87% platinum for one conductor, pure platinum for the other conductor. The S type has 10% rhodium / 90% platinum for one conductor and pure platinum for the other conductor.

The main difference between the R and S type thermocouples is that the R delivers 15% more mV than the type S. They are both rated to the same temperature. We sell the type S. The only reason we don't sell the type R is that it is almost the same as the type S.

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