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

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

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Process Control and Instrumentation
Time constant is the

Same as transportation lag
Time taken by the controlled variable to reach 63.2% of its full change
Same as dead time
Time required by the measured variable to reach 63.2% of its ultimate change

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