Process Control and Instrumentation
Which of the following instruments is not used for measuring sub-zero (<0°) temperatures?

Mercury in glass thermometer
Radiation pyrometer
Platinum resistance thermometer
Vapor pressure thermometer

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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

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

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