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

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

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Process Control and Instrumentation
Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are

Air to close valve with the controller direct acting
Air to open valve with the controller indirect acting
Air to close valve with the controller indirect acting
Air to open valve with the controller direct acting

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