Which of the following is not a second order instrument ?
Correct answer: D. Bare mercury in glass thermometer
- A. Mercury in glass thermometer with covering
- B. None of these
- C. Pressure gauge with one bellow, two tubes and a tank
- D. Bare mercury in glass thermometer
Explanation
A bare mercury-in-glass thermometer is normally treated as a first-order instrument, since its bulb temperature follows the surroundings with one dominant time constant. The covering and added thermal elements can introduce a second-order response.
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