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A flue gas analyser measures the oxygen in the flue chiefly in order to determine

  • A.the excess air the combustion is using
  • B.the calorific value of the fuel being burnt
  • C.the moisture content of the combustion air
  • D.the draught available at the chimney base

Answer: A

Excess air carries heat up the stack for nothing, and the oxygen left over is the direct measure of how much is being admitted. Too little air is worse still, producing carbon monoxide and unburnt fuel, so the analyser reports both.

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