Type S thermocouple

The Type S thermocouple is composed of a platinum-10% rhodium (+) wire versus a platinum (-) wire. This type of thermocouple can be used in oxidizing or inert atmospheres with a service temperature range between 0°C and 1600°C.

They should never be used in reducing atmospheres. As with all platinum type thermocouples, they should always be protected with a ceramic protection tube. Alumina insulators and protection tubes are preferred to prevent silica contamination from Mullite alumina ceramic tube.

Type S Thermocouple (Platinum Rhodium - 10% / Platinum): The Type S is used in very high temperature applications such as high temperature laboratory muffle furnace, tube furnace, Industry bogie hearth furnace. It is sometimes used in lower temperature applications because of its high accuracy and stability. The type S is often used with a ceramic protection tube.

Type S Temperature Range:

Maximum continuous operating temperature: up to 1600 C

Short term use: up to 1,700 C

Type S Thermocouple Grade WireThermocouple grade wire, -50 to 1480 C

Extension wire, 0 to 200 C

Accuracy (whichever is greater):

Standard: +/- 1.5C or +/- .25%

Special Limits of Error: +/- 0.6C or 0.1%

The Type S can be used in inert and oxidizing atmospheres up to 1600 C continuously and up 1700 C for short term use, these furnace usually used MoSi2 heater and S type thermmocoulple.

When Type S thermocouples are continuously used at high temperatures, the elements can develop excessive grain growth in time causing mechanical breakage to the thermocouple. In most situations, platinum thermocouples should not be placed in any type of metal tube or applications where metallic vapors are present.