Process Control and Instrumentation
The function of a transducer is to

Modify the input signal
Convert the primary signal into a more useful quantity, usually an electric impulse
Codify/decodify the input signal
Amplify the input signal

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

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