Process Control and Instrumentation
Dome temperature of blast furnace stove is most accurately measured by a

Radiation pyrometer
Platinum resistance thermometer
Iron-constantan thermocouple
Platinum-platinum/rhodium ther-mocuple

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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

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

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