Process Control and Instrumentation
Radiation pyrometers as compared to thermocouples

Can't measure the temperature of moving objects
Can measure higher temperature
Has a slower speed of response
Is more affected by corrosive atmosphere

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

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