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

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Process Control and Instrumentation
Thermodynamic celcius scale of temperature measurement is

Defined on the basis of melting point of ice and evaporation temperature of water vapor
Both A&B Here
Having an interval of 100° between ice point to steam point
Having an interval of 100° between ice point to steam point

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