Process Control and Instrumentation
Pick out the one which is a first order instrument.

Mercury in glass thermometer (without any covering or air gap)
All of these
Bare vapor pressure thermometer
Bare metallic thermometer

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Process Control and Instrumentation
Time constant is the

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
Same as dead time

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