thermocouple
Thread Content
Is it necessary to evacuate the S thermocouple at 1300°C? Will not doing so affect its lifespan and accuracy?
The S-type is a platinum-rhodium thermocouple; platinum-rhodium is resistant to oxidation but sensitive to reduction, so there is no need for vacuum conditions. It is also best to avoid direct contact with reducing agents at high temperatures
Vacuuming may not be intended to prevent oxidation, but rather to counter the effects of certain reducing process gases at high temperatures, as well as gases containing hydrogen sulfide, ammonia, or other corrosive gases.