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In OXYMAT-M oxygen analyser which of the following is usually used as reference gas?

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In OXYMAT-M oxygen analyser which of the following is usually used as reference gas?

(a) Hydrogen

(b) Nitrogen

(c) Helium

(d) Ambient air

I have been asked this question in an internship interview.

Asked question is from Magnetic Wind Instruments in section Industrial Gas Analysers of Analytical Instrumentation

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Correct choice is (d) Ambient air

The explanation: In OXYMAT-M oxygen analyser, ambient air is usually used as a reference gas. Its measuring procedure is based on pressure difference which develops between two gases having different oxygen concentration in the magnetic field.

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