In OXYMAT-M oxygen analyser which of the following is usually used as reference gas?(a) Hydrogen(b) Nitrogen(c) Helium(d) Ambient airI have been asked this question in an internship interview.Asked question is from Magnetic Wind Instruments in section Industrial Gas Analysers of Analytical Instrumentation

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

1.	In OXYMAT-M oxygen analyser which of the following is usually used as reference gas?(a) Hydrogen(b) Nitrogen(c) Helium(d) Ambient airI have been asked this question in an internship interview.Asked question is from Magnetic Wind Instruments in section Industrial Gas Analysers of Analytical Instrumentation
Answer» 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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