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In the Beckman instrument, the flow rate recommended when the sample enters through a porous diffusion disc is which of the following?

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In the Beckman instrument, the flow rate recommended when the sample enters through a porous diffusion disc is which of the following?

(a) 100-200 cc/min

(b) 50-250 cc/min

(c) 40-60 cc/min

(d) 200-300 cc/min

I got this question in an interview for internship.

The above asked question is from Paramagnetic Oxygen Analyser in division Industrial Gas Analysers of Analytical Instrumentation

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The correct choice is (b) 50-250 cc/min

To explain: In the Beckman instrument, the flow rate recommended when the sample enters through a porous diffusion disc is 50-250 cc/min. paramagnetic oxygen analyzer was first described by Pauling.

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