Optimal combustion is achieved when the air/fuel ratio is continuously optimal.
Each fuel flow rate requires a perfectly fine-tuned air flow rate. For this reason, modern burners are equipped with precision controls and electronic controllers.
But even the most perfectly fine-tuned regulators cannot prevent that the air/fuel ratio does not always remain optimal. External factors such as atmospheric changes have an impact on the air/fuel ratio. Soiling and wear on the burner components can also lead to a deviation from the optimum air/fuel ratio.
In order to keep the combustion optimal, the burner control unit is equipped with a residual oxygen regulator. The amount of oxygen in the combustion gasses is measured continuously and its value is compared with a pre-programmed set-point. At the slightest deviation, a correction signal is sent to the combustion air controller.