Process Control and Instrumentation
Temperature of __________ can not be measured by an optical or radiation pyrometer.

Molten slag flowing out of blast furnace
Rotary limestone calcination kiln
Combustion space in boilers
Hot blast (air) from stoves

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

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

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