Process Control and Instrumentation
Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature

Rusting of iron takes place
Embrittlement of iron occurs
Both B and C Here
Emf produced is very low of the order of microvolt

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Process Control and Instrumentation
Thermodynamic celcius scale of temperature measurement is

Having an interval of 100° between ice point to steam point
Defined on the basis of melting point of ice and evaporation temperature of water vapor
Both A&B Here
Having an interval of 100° between ice point to steam point

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