Device for the calibration of a gas burner regulating system

A method for gas burner regulation, wherein a gas-combustion-air mixture, which is provided as a result of intermixing a gas flow and an air flow, is fed to a gas burner for combustion, wherein the quantity of gas-combustion-air mixture which is fed to the gas burner, and therefore a burner load, is adjusted by means of a blower which is associated with the air flow or with the gas-combustion-air mixture flow, wherein the gas flow, by means of a gas valve which is associated with the gas flow, is adjusted in dependence upon the air flow in such a way that a prespecified, defined composition of the gas-combustion-air mixture is maintained independently of the air flow, and wherein for calibration of the gas burner regulating system, specifically for calibration of the composition of the gas-combustion-air mixture, use is made of a sensor which is associated with an exhaust gas discharged from the gas burner and measures a concentration of at least one combustible or oxidizable constituent in the exhaust gas, wherein the calibration of the gas burner regulating system includes:

• starting from a relatively lean gas-combustion-air mixture which is fed to the gas burner for combustion, the gas-combustion-air mixture is enriched until the measurement signal which is provided by the sensor first increases and then reduces to approximately zero, wherein the gas-combustion-air mixture, in which the measurement signal which is provided by the sensor amounts to approximately zero, is defined as a gas-combustion-air mixture with a stoichiometric combustion air ratio of λ=1, and in that starting from this gas-combustion-air mixture the gas-combustion-air mixture is enleaned to a desired combustion air ratio of λ>1.

A gas burner regulating system for regulating a gas-combustion-air mixture that is provided to a gas burner, comprising:

• a control unit configured to control a gas flow rate adjusting device, the control unit enriching the gas-combustion-air mixture that is provided to a gas burner by moving the gas flow rate adjusting device to a more open position, and enleaning the gas-combustion-air mixture that is provided to a gas burner by moving the gas flow rate adjusting device to a more closed position;
• a sensor associated with an exhaust gas discharged from the gas burner, the sensor configured to provide a measurement signal that is related to a concentration of at least one combustible or oxidizable constituent in the exhaust gas;
• during a calibration process, and starting from a relatively lean gas-combustion-air mixture which is fed to the gas burner for combustion, the control unit moves the gas flow rate adjusting device to a more open position to enrich the gas-combustion-air mixture until the measurement signal of the sensor first increases and then reduces to approximately zero, wherein the gas-combustion-air mixture which corresponds to the measurement signal being approximately zero is defined as a gas-combustion-air mixture with a stoichiometric combustion air ratio of λ=1;
• and
• the control unit then moves the gas flow rate adjusting device to a more closed position to enlean the gas-combustion-air mixture to a desired combustion air ratio of λ>1.