Abstract: An electrochemical gas sensor (1) having a stacked assembly of at least one first electrode (3) and a second electrode (6), which are respectively arranged on a carrier membrane (2, 5), and a separator (4) arranged between the electrodes (3, 6), including a gas conduction path (14) between the first electrode (3) and the second electrode (6). The gas conduction path (14) is constituted within the structural space defined by the electrodes (3, 6).

Abstract: A method for determining an NOx concentration in a measurement gas is provided, where a measurement value for the NOx concentration is determined from the sensor signal of a gas sensor and a measurement value for the concentration of a second component in the measurement gas is determined. A corrected value for the NOx in the measurement gas is determined from the measurement values, and the measurement value and the corrected measurement value for the NOx concentration are displayed and/or output.

Abstract: A method for determining an NOx concentration in a measurement gas is provided, where a measurement value for the NOx concentration is determined from the sensor signal of a gas sensor and a measurement value for the concentration of a second component in the measurement gas is determined. A corrected value for the NOx in the measurement gas is determined from the measurement values, and the measurement value and the corrected measurement value for the NOx concentration are displayed and/or output.

Abstract: A method for determining the difference in enthalpy that occurs when a gas stream loaded with water vapor is cooled to a temperature below the dew point temperature, especially for determining its water vapor content (moisture measurement) is disclosed. The device preferably used to perform the method includes a gas cooler having an electrical cooling element and inlet and outlet ports through which a gas stream flows. Measuring devices are provided in the inlet and outlet ports to detect state parameters and through-flow values of the gas stream. The outputs from the measuring devices are evaluated by an evaluation device in connection with the electrical power draw of cooling element to determine the difference in enthalpy between the inlet and outlet ports and/or the water content of the gas stream.

Abstract: The invention relates to a process and a device for measuring a gas medium with a chemical sensor that has a nominal measuring range. The chemical sensor is exposed to a gas mixture consisting of sample gas stream and dilution gas stream. In order to ensure that the chemical sensor always works within its nominal measuring range, the dilution ratio is readjusted. According to the invention, the dilution ratio is determined by substance concentration measurement of a defined substance component.