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

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Process Control and Instrumentation
Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by

Using steel tube in place of glass tube
Accounting for the tube expansion
Increasing the diameter of the tube
Filling nitrogen under pressure in the stem

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