Gas concentration measurement system and airway adapter thereof

An airway adapter suitable for a gas concentration detection device of a gas concentration measurement system, the gas concentration detection device including a main body, the main body including an accommodating passageway, a check unit, a transmitter unit and a receiver unit, the transmitter unit and the receiver unit being oppositely disposed on two sides of the accommodating passageway, the check unit being disposed between the transmitter unit and the receiver unit, the check unit including a plurality of check terminals, the plurality of check terminals being exposed in the accommodating passageway, the accommodating passageway being in a cylindrical shape and passing through the main body to form a circular inlet and a circular outlet, the airway adapter comprising:

• an inlet section, a detection section, an identification part and an outlet section, the detection section being integrally connected between the inlet section and the outlet section, the detection section including a light entering detection window and a light exiting detection window that are integrally formed, the light entering detection window and the light exiting detection window being oppositely arranged on two sides of the detection section, the identification part being disposed on one side of the detection section, the identification part having an identification chip disposed therein, an outer diameter of the inlet section being greater than an outer diameter of the outlet section;
• wherein, when the airway adapter is mated with the accommodating passageway of the gas concentration detection device along an axis of the airway adapter, the plurality of check terminals abut the identification chip of the identification part to check whether or not the airway passageway is matched with the gas concentration detection device, the outer diameter of the outlet section is substantially equal to a diameter of the accommodating passageway and is in tight contact with the circular outlet of the accommodating passageway, and one end of the inlet section abuts and covers the circular outlet of the accommodating passageway.