Process Control and Instrumentation
Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 - 1600°C?

Radiation pyrometer
Photoelectric pyrometer
Thermocouples
Optical pyrometer

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

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