Test items: Used for the detection of the dead space of the protective mask, that is, the volume fraction of CO2 in the inhaled gas. dead space of protective masks, that is, the volume fraction of CO2 in the inhaled gas. Instrument Usage: It is used to detect the dead space of the protective mask, that is, the volume fraction of CO2 in the inhaled gas. Standards Compliant: GB 2626-2019 Respiratory protection equipment self-priming filter anti-particulate respirator 6.9 Dead space; GB 2890-2009 Respiratory protection Self-priming filter type gas mask; GB 21976.7-2012 Building fire escape and refuge equipment Part 7: Filter type fire self-rescue breathing apparatus; BS 149:2001 + A1:2009 7.12 The content of carbon dioxide in the inhaled air; Features: 1. Color touch screen display operation, Chinese and English interface, menu operation mode. 2. Three British imported carbon dioxide sensors monitor the concentration of carbon dioxide and automatically calculate the test results. 3. The design of dual breathing simulator is adopted to simulate the sine wave curve of human breathing; 4. Highly simulated silicone head mold, which truly simulates the wearing effect of a real person; Technical Parameter: 1. Breathing simulator simulates breathing frequency modulation: (10～25) times/min; 2. Adjusting range of simulated breathing tidal volume: (0.5～2.0) L/min; 3. The volume fraction of carbon dioxide gas source: (5.0±0.1)%; 4. Carbon dioxide flow meter range: 10L/min, accuracy is 0.2L/min; 5. Exhalation carbon dioxide analyzer range: 20%, accuracy: 0.1%; 6. (Inhalation, air) carbon dioxide analyzer range: 5%, accuracy: 0.01%; 7. Electric fan: wind speed 0.5m/s 8. Power supply: AC220V, 50Hz 9. Dimensions (L×W×H): 820mm×520mm×1380mm 10. Weight: about 60Kg Configuration List: 1. Host (including: medium head model) 1 set 2. 1 electric fan 3. 1 product certificate 4. Product instruction manual 1 copy