Type K thermocouples is the hysteresis effect that occurs when a Type K thermocouple is cycled up and down in temperatures above and below 800°C, and when Oxygen is deficient. The re-ordering of the crystalline structure changes with each cycle. After the first pass above this temperature, the Type K temperature indication will probably be accurate. However, with each additional cycle after this one, the error will increase more and more. The Type K thermocouple also experiences a cumulative drift after a period of time at temperatures above 900degC. Finally, this thermocouple experiences a physical defect called “green rot” which is caused due to preferential oxidation of the chromel leg.
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