It sends nitrogen and other gases in the air to the tubes inside through the compressor. Only oxygen atoms pass through these filter tubes due to their small atomic diameter and reach the patient.
In the concentrator, there is a compressor, 2 filter tubes, valve and electronic card controlling it, oxygen tank, pressure regulator, a fine filter from the tank to the patient, dust catcher filter at the compressor inlet, 1 nitrogen outlet filter at the valve outlet and a few hoses.
If it runs noisily, chemical tubes may have started to deteriorate or compressor bearings and bearings may be deformed.
Device maintenance should be controlled by changing the air inlet filter, oxygen measurement, humidifier container during a certain period of time to make sure that it really gives oxygen, is clean and healthy.