![]() ![]() In most situations, platinum thermocouples should not be placed in any type of metal tube in high-temperature applications Type B thermocouples are less susceptible to grain growth and calibration drifts than R and S type thermocouples. Alumina insulators and protection tubes are preferred to prevent silica contamination from Mullite ceramics. As with all platinum type thermocouples, they should always be protected with a ceramic protection tube. Vacuum applications are possible for short periods of time. ![]() They should never be used in reducing atmospheres. This type of thermocouple can be used in oxidizing or inert atmospheres with a service temperature range between 870☌ and 1700☌ (1000☏ to 3100☏). The Type B thermocouple is composed of a platinum-30% rhodium (+) wire versus a platinum-6% (-) wire. Before choosing the type of thermocouple for your process, make sure you are aware of the limitations of all available calibration types. The most common types of thermocouples are the Type B, E, J, K, N, R, S, T, C, & P.
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