Method for checking a gas mixture sensor in a fuel gas operated heater

摘要

The invention relates to a method for checking a gas mixture sensor with regard to its error-free function in a heating device operated by fuel gas, a gas mixture being generated by providing a quantity of gas via a first actuator (4, 107) and a quantity of fuel gas via a second actuator (3, 102) are mixed, wherein the gas mixture sensor (10, 106) is positioned in the gas mixture to detect a material property of the gas mixture (9, 105) and continuously transmits a sensor signal that is dependent on the respective gas mixture to a control unit (11, 100) Control unit (11, 100) based on a target value of the sensor signal of the gas mixture sensor for a target gas mixture for checking the gas mixture sensor, the fuel gas quantity is temporarily changed in a predefined manipulated variable of the second actuator so that a mixture ratio of the gas mixture changes, and then via the first Actuator the amount of gas s It is increased far until the target value of the sensor signal of the gas mixture sensor is reached again, and the values of the fuel gas quantity and the gas quantity that are subsequently set are recorded and the mixture ratio of the changed gas mixture is calculated from this and compared with the target gas mixture.