Noble metal thermocouples are manufactured with wire that is made with precious or “noble” metals like Platinum and Rhodium.
Noble metal thermocouples can used in oxidizing or inert applications and must be used with a ceramic protection tube surrounding the thermocouple element.
These sensors are usually fragile and must not be used in applications that are reducing or in applications that contain metallic vapors.
- Type R - Type R thermocouples are made with a platinum/13% rhodium positive leg and a pure platinum negative leg. The temperature range for type R is 0 to 1450ºC (32 - 2642 ºF).
- Type S - Type S thermocouples are made with a platinum/10% rhodium positive leg and a pure platinum negative leg. The temperature range for type S is 0 to 1450ºC (32 - 2642 ºF).
- Type B - Type B thermocouples are made with a platinum/30% rhodium positive leg and a platinum/6% Rhodium negative leg. The temperature range for type B is 0 to 1700ºC (32 - 3092ºF).