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How do you calculate AFR?

Updated: 9/18/2023
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13y ago

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When you use an AFR meter connected to an oxygen sensor that is placed in the exhaust stream of a combustion engine, the AFR meter will calculate the AFR for you through a complex set of equations specific to the sensor and the fuel type. The sensor heats up to a certain temperature and detects the amount of oxygen atoms in the air that passes it. As the oxygen levels and temperature of the sensor fluctuate, the AFR meter compensates for these changes and provides the user with an accurate lambda value that, for combustion engines, is multiplied by 14.7 to give the user an Air-Fuel Ratio value.

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13y ago
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Q: How do you calculate AFR?
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