Discussion
What is the significance of measuring both carbon monoxide and oxygen in flue gas?
Answer: C
Excess oxygen shows how much air is being supplied and carbon monoxide shows whether that air is being used effectively, so the pair locates the operating point between wasteful excess air and incomplete combustion. Efficiency is highest just before carbon monoxide begins to rise. Moisture, sulphur and calorific value are all measured or calculated by other means. This is the classic example of two simple measurements being far more informative together than either is alone.
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