Principle of oxygen production This machine takes -220 V power supply as the power source the air as the raw material, uses the high quality molecular sieve, through the pressure swing adsorption separation method (Psa method) at room temperature, produces the high purity oxygenI Key technical indicators 1. rated power: AC220V, 50HZ 2. rated input power: 135 W 3. oxygen flow rate 1 L/min, oxygen concentration 90% 4. Oxygen flow rate 2-7 L / min , oxygen concentration 50-26%4 , noise : front 43 db ( A ) ( average ) ; whole machine 50 db ( A ) 5. Net 5. : 5.5 kg 6. dimensions : 22x18x29 (cm) 7. altitude : no reduction in oxygen concentration from sea level to 1828m Less than 90% efficiency at 4000m