An oxygen concentrator works by: 

Pulling in air through an air filter

Forcing the air through an air compressor, which pressurizes it

Passing the compressed air over zeolite, which adsorbs nitrogen from the air

Collecting the remaining gas, which is mostly oxygen

Passing the nitrogen desorbed from the zeolite under reduced pressure to be vented

Delivering the purified, oxygen-rich air to the patient

Before it goes into the concentrator, air is made up of 80 percent nitrogen and 20 percent oxygen. An oxygen concentrator comes out as 90 to 95 percent pure oxygen and 5 to 10 percent nitrogen. 

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One disadvantage of oxygen concentrators is that they need electrical power to function. Many oxygen concentrators do not have backup batteries that will power the device in the event of power failure. Consider using with a voltage stabilizer and surge pr

otector.    

An oxygen concentrator receives air, purifies it, and then distributes the newly formed air. Before it goes into the concentrator, air is made up of 80 percent nitrogen and 20 percent oxygen. An oxygen concentrator uses that air then it comes out as 90 to 95 percent pure oxygen and 5 to 10 percent nitrogen.Sure, oxygen cylinders store oxygen under pressure, providing a portable source of supplemental oxygen for individuals who have difficulty breathing or need higher oxygen levels. They're commonly used in medical settings, for emergency purposes, or in industries like welding and metal cutting.