Process Control and Instrumentation
Accurate temperature measurement performance of a radiation pyrometer can not be affected, if the

Object is transparent
Object and surrounding are at almost the same temperature
Enhancement or attentuation of redia-tion occurs in the sighting path
Object has varying emissivity

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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
Having an interval of 100° between ice point to steam point
Both A&B Here

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