Method and device for measuring NO;concentration using measurements of NO;and a second gas component
First Claim
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1. Method for determining a NOx concentration in a measurement gas, comprising:
- providing a sensor signal from a first gas sensor that is sensitive for NOx and that is brought into contact with the measurement gas and determining a measurement value for the NOx 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 NOx concentration in the measurement gas from the measurement value for the oxygen concentration in the measurement gas, anddisplaying the measurement value and the numerical value for the NOx concentration in the measurement gas, wherein the measurement value for the NOx 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 NOx 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.
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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.
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Citations
21 Claims
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1. Method for determining a NOx concentration in a measurement gas, comprising:
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providing a sensor signal from a first gas sensor that is sensitive for NOx and that is brought into contact with the measurement gas and determining a measurement value for the NOx 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 NOx 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 NOx concentration in the measurement gas, wherein the measurement value for the NOx 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 NOx 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Device for determining a NOx concentration in a measurement gas, comprising:
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a first gas sensor that is sensitive to NOx configured for contact with the measurement gas to produce a first sensor signal, a second gas sensor sensitive to a second component of the measurement gas (3) configured for contact with the measurement gas to produce a second signal, an evaluation unit (8) configured to determine a measurement value for the NOx concentration in the measurement gas (3) from the first sensor signal from the first gas sensor and a numerical value for the NOx concentration in the measurement gas from the measurement value determined from the first sensor signal and the second sensor signal, a display that displays the numerical value and the measurement value, and a storage device in which a first characteristic line for evaluation of the sensor signal of the first gas sensor and a second characteristic line for evaluation of a second sensor signal are stored, wherein the evaluation unit determines a difference value or factor by which a numerical value deviates from the measurement value for the NOx concentration in the measurement gas using the second characteristic line, wherein different characteristic lines are stored from which a difference value or factor can be taken by which the numerical value deviates from the measurement value for the NOx concentration in the measurement gas. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. Method for determining a NOx concentration in a measurement gas, comprising:
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providing a sensor signal from a first gas sensor that is sensitive for NOx and that is brought into contact with the measurement gas and determining a measurement value for the NOx 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 NOx 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 NOx concentration in the measurement gas, wherein the measurement value for the NOx 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 NOx 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 and wherein the first characteristic line (19, 20, 21) is the characteristic line of;
an infrared sensor, UV sensor, an electrochemical sensor, or a semiconductor sensor.
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21. Method for determining a NOx concentration in a measurement gas, comprising:
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providing a sensor signal from a first gas sensor that is sensitive for NOx and that is brought into contact with the measurement gas and determining a measurement value for the NOx 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 NOx 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 NOx concentration in the measurement gas, wherein the measurement value for the NOx 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 NOx 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 and wherein the first characteristic line (19, 20, 21) is the characteristic line of a chemiluminescence detector.
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Specification