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

Mercury
Oil
A metal powder or graphite
Air

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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

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

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