Process Control and Instrumentation
Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a

Reistance thermometer
Thermocouple
Mercury in glass thermometer
Vapor pressure thermometer

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

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