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Chemical Engineering - Process Control and Instrumentation - Discussion

Discussion Forum : Process Control and Instrumentation - Section 5 (Q.No. 6)
Process Control and Instrumentation
6.
Which of the following is not a second order instrument ?
Mercury in glass thermometer with covering.
Bare mercury in glass thermometer.
Pressure gauge with one bellow, two tubes and a tank.
None of these.
Answer: Option
Explanation:
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