Process Control and Instrumentation
Pick out the one which is a first order instrument.

All of these
Bare vapor pressure thermometer
Bare metallic thermometer
Mercury in glass thermometer (without any covering or air gap)

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Process Control and Instrumentation
Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by

Using steel tube in place of glass tube
Filling nitrogen under pressure in the stem
Increasing the diameter of the tube
Accounting for the tube expansion

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