Process Control and Instrumentation
Thermal wells are used in the temperature measurement to

Increase the fidelity
Reduce measuring lag
Increase the sensitivity
Guard against corrosive and oxidising action on thermocouple materials

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

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

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