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Why is nitrogen meters generally not calibrated for dry gases while measuring nitrogen?

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Why is nitrogen meters generally not calibrated for dry gases while measuring nitrogen?

(a) It causes error

(b) Range decreases

(c) Reading tend to be non-linear

(d) It cannot be measured

The question was posed to me in quiz.

This key question is from Method Based on Ionization of Gases in chapter Industrial Gas Analysers of Analytical Instrumentation

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The correct option is (a) It causes error

Easiest explanation: Nitrogen meters are generally not calibrated for dry gases because it will lead to error in the reading. The error will be up to 2%.

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