Process Control and Instrumentation
A sinusoidal variation in the input passing through a linear first order system

Gets amplified (magnitude increases)
Becomes more oscillatory (frequency increases)
Becomes less oscillatory (frequency decreases)
Gets attenuated (magnitude decreases)

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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
Making the volume of thermometer bulb as large as conveniently possible
All of these

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