Process Control and Instrumentation
Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by

Reducing the volume of the capillary to a minimum
Reducing the volume of the receiving element to a minimum
Making the volume of thermometer bulb as large as conveniently possible
All of these

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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 is transparent
Object has varying emissivity
Object and surrounding are at almost the same temperature

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