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

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

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

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