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If the oxygen content is greater than 21%, which of the following gases must be used to set the span point?

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If the oxygen content is greater than 21%, which of the following gases must be used to set the span point?

(a) Oxygen

(b) Dry air

(c) Nitrogen

(d) Hydrogen

The question was posed to me in my homework.

The doubt is from Paramagnetic Oxygen Analyser in division Industrial Gas Analysers of Analytical Instrumentation

1 Answer

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Best answer
Right answer is (a) Oxygen

Explanation: If the oxygen content is greater than 21%, oxygen is used to set the span point. This is done for calibration purposes.

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