Non-dispersive infrared gas analyzer

A non-dispersive infrared gas analyzer for verifying a measuring gas component in a gas mixture, comprising:

• an infrared radiation source for generating an infrared radiation;
• a modulation device for modulating the infrared radiation;
• a measuring vessel containing the gas mixture and irradiated by the modulated infrared radiation;
• a detector device arranged behind the measuring vessel in the radiation direction, the detector device providing a measuring signal which corresponds to a concentration of the measuring gas component in the gas mixture;
• at least one optopneumatic detector arranged in the radiation path of the infrared radiation source, wherein when the at least one optopneumatic detector is arranged between the infrared radiation source and the measuring vessel being filled with any gas, and when the at least one optopneumatic detector is filled with the measuring gas component, then the concentration of the measuring gas component in the optopneumatic detector is lower than the concentration of the measuring gas in the measuring vessel, and when the at least one optopneumatic detector is arranged between the measuring vessel and the detector device, then the optopneumatic detector is filled with a gas having an absorption spectrum outside of a spectra of the measuring gas component and further interferent gases in the gas mixture;
• and a correction device for correcting the measuring signal of the detector device with a detector signal generated by the optopneumatic detector.