Gas analyzer for measuring nitrogen oxides and least one further component of an exhaust gas

A gas analyzer for measuring nitrogen oxides and at least one further component of an exhaust gas, the gas analyzer comprising:

• an oxidation device including an ozone generator, a reaction chamber located in an exhaust gas path, and a heating chamber located downstream thereof in the exhaust gas path, the oxidation device being configured to treat the exhaust gas with generated ozone in the reaction chamber to convert nitrogen monoxide into nitrogen dioxide and to induce thermal decomposition of nitrogen oxides and excess ozone into nitrogen dioxide and oxygen in the heating chamber;
• a photometer located downstream of the oxidation device in the exhaust gas path, the photometer being configured to ascertain a concentration of the nitrogen dioxide based on absorption of light in a near-ultraviolet range between 350 nm and 500 nm in the treated exhaust gas and output said concentration as a nitrogen oxide concentration of the untreated exhaust gas;
• and
• a further photometer arranged in the exhaust gas path between the reaction chamber and the heating chamber, said further photometer being configured to ascertain an ozone concentration in partially treated exhaust gas based on absorption of light in a mid-ultraviolet ultraviolet range between 220 nm and 300 nm and to output the said concentration as an oxygen concentration of the untreated exhaust gas;
• wherein the ozone generator includes an ultraviolet light source arranged in the reaction chamber which generates ozone from a residual oxygen content of the exhaust gas.