Measuring apparatus for gas analysis

A spectrometric gas measuring apparatus for determining the presence of gases in a spatial region, the apparatus comprising:

• a spectrometric measurement head that is mountable at the spatial region including an irradiation source and an analyzer, the irradiation source transmitting measurement beams having spectral ranges required for the determination of the gases into the spatial region;
• a measurement reflector at the spatial region that reflects light that has passed through at least a portion of the spatial region back to the measurement head, the light being spectrally broken down in the analyzer;
• a photoreceiver arrangement that receives the spectrally broken down light from the analyzer and generates electrical signals that are respectively associated with a specific wavelength, the electrical signals being applied to an electronic evaluation circuit that determines the presence of the gases;
• and
• a measurement tube in the spatial region through which the measurement radiation passes, the measurement tube extending in a direction of light propagation and having a transverse throughflow opening communicating with the surrounding spatial region, the measurement tube being closed at an end remote from the measurement head and accommodating the measurement reflector, the measurement tube being supplied at both ends of the transverse throughflow opening with a spectrally neutral flushing gas relative to a spectral measurement range at a slightly higher pressure relative to the spatial region.