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

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

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Process Control and Instrumentation
Time constant is the

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

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