Process Control and Instrumentation
Which of the following temperature measuring instruments need not touch the object whose temperature is being measured?

Mercury in glass thermometer
Filled system thermometer
Thermo electric pyrometer
Radiation/infrared pyrometer

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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

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

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