LFY-707 Protective Mask Dead Space Tester

Main purpose
This instrument is used for detecting the dead space of protective masks, which refers to the volume fraction of CO₂ in the inhaled air. 
Technical indicators

1. The breathing simulator simulates breathing frequency: 10 to 40 times per minute. 
2. Simulated tidal volume adjustment range: 0.5 - 3.0 L/min 
3. The volume fraction of the carbon dioxide gas source is 5.0 ± 0.1% 
4. Carbon dioxide flow measurement range: not less than 40 L/min 
5. Range of carbon dioxide analyzer: Not less than 12%, accuracy not less than 0.1% 
6. Electric fan: Wind speed 0.5m/s 
7. Respiratory rate: 20 breaths per minute 
8. Tidal volume of breathing: 1.5L 
9. Power Supply: AC 220V 50Hz 
10. Real-time automatic calculation and display of the volume fraction of CO2 in the inhaled air 
11. Dimensions: 980mm * 820mm * 1400mm 
Applicable Standards 
GB 2626-2019 Respiratory Protection - Self-Contained Filtering Respirators for Particulate Matter 
GB 2890-2022 Respiratory Protection Self-Contained Filtering Respirator

GB 21976.7-2012 Building Fire Escape and Refuge Equipment - Part 7: Filter-type Fire Self-rescue Respirators 
GB 19803-2023 Medical Protective Masks 
GB/T 16556-2025  Respiratory Protection - Self-contained Open-Circuit Air Breathing Apparatus