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Which of the following is the normal sampling rate used in nitrogen meters?

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Which of the following is the normal sampling rate used in nitrogen meters?

(a) 13 ml/min

(b) 33 ml/min

(c) 3 ml/min

(d) 43 ml/min

The question was posed to me during an interview.

My question is from Method Based on Ionization of Gases in section Industrial Gas Analysers of Analytical Instrumentation

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Right option is (c) 3 ml/min

To explain: The normal sampling rate used in nitrogen meters is 3 ml/min. Modern nitrogen analyzers have digital displays.

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