Discussion
What is a zero gas in analyser calibration?
Answer: B
Zero gas contains none of the target component, typically nitrogen or purified air, and sets the baseline of the instrument. Span gas at a known concentration near the top of the working range then sets the sensitivity, and the two together define the calibration line. Using ambient air as a zero is acceptable only when the component is genuinely absent from it, which is not true for carbon dioxide. The zero and span pair is the minimum calibration for almost every continuous analyser.
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