Patent ID: 8852950

Claim:
Method for determining a NO x concentration in a measurement gas, comprising: providing a sensor signal from a first gas sensor that is sensitive for NO x and that is brought into contact with the measurement gas and determining a measurement value for the NO x concentration from the sensor signal, determining a measurement value for a concentration of a second component in the measurement gas from a second gas sensor, the second component being oxygen, determining a numerical value for the NO x concentration in the measurement gas from the measurement value for the oxygen concentration in the measurement gas, and displaying the measurement value and the numerical value for the NO x concentration in the measurement gas, wherein the measurement value for the NO x concentration in the measurement gas is determined with reference to a stored first characteristic line from the sensor signal of the first gas sensor, wherein the numerical value for the NO x concentration in the measurement gas is determined with reference to a stored second characteristic line from the sensor signal of at least one of the first or the second gas sensor.