Process Control and Instrumentation
Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability?

Fused metal (Na or K) in steel thermometer
Nitrogen in steel thermometer
Mercury in glass thermometer
Alcohol in glass thermometer

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

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

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