CO/CO2 ratio
Carbon monoxide divided by carbon dioxide in the flue gases. It shows combustion quality independent of how much excess air is present.
Ratio = CO in ppm ÷ (CO₂ in % × 10,000), because 1 % is 10,000 ppm. Most flue gas analysers display it directly.
Acceptable values depend on the appliance. Use the manufacturer’s instructions and the industry action levels you work to.
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A plain-language explanation, not a technical procedure or legal advice. Follow the current regulations, industry procedures and manufacturer’s instructions.