Device for detecting at least the CO2 concentration in the ambient air

摘要

Device for detecting at least the concentration of CO2 in the ambient air, in particular within a closed space, on the basis of the infrared gas absorption with an infrared gas analyzer, comprising a motherboard (1) as a central module with a radiator (2) for generating infrared radiation, an optical cuvette (3) made of a perforated cuvette tube, which hardly obstructs the gas molecules in the free diffusion on the one hand, but has the necessary optical reflection properties for guiding the infrared radiation, wherein at one end of the cuvette tube the emitter (2) and at the other end at least one detector (4) for the infrared radiation as a function of the CO2 concentration are arranged and further on the motherboard (1) at least one microcontroller for evaluating the measurement result is present, characterized in that the cuvette (3) is longitudinally divided and from a Lower shell (5) and e Iner upper shell (6) with at least one downwardly extending fixing pin (7) for attachment to the motherboard (1), wherein the upper shell (6) and the lower shell (5) are positively connected to each other and at one end in the lower shell ( 5) an opening (8) for the infrared radiator (2) opening at the top in the cuvette tube and at the other end a housing chamber (9) on the lower shell or the upper shell (5) or parts of this chamber thereon for receiving the at least one detector (4) are provided, wherein the infrared radiator (2) and the detector (4) on the motherboard (1) or in the receptacle (8) or in the chamber (9) are fixed, and that the lower shell (5) and the upper shell ( 6) at the end of the cuvette (3) with the receptacle for the infrared radiator (2) have a parabolic mirror forming formation (10), in the focal point of the infrared radiator (2) is arranged, the infrared radiation through the cuvette tube in the direction of the other End of the cuvette (3) is reflected, on which a mirror surface (11) is arranged obliquely so that the reflected infrared radiation impinges on the detector (4).