Process Control and Instrumentation
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with

Air
A metal powder or graphite
Oil
Mercury

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Process Control and Instrumentation
Time constant is the

Same as transportation lag
Same as dead time
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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