1. To select the model with oxygen concentration of 90% output from the oxygen generator, the oxygen concentration can be detected by the instrument or the oxygen monitoring device provided by the machine.

2. The noise level of the oxygen generator should be less than 45 dB. The oxygen generator is an electrical appliance that works for a long time, and the sound must not be too loud, otherwise it will affect the rest of myself and others, especially at night. Therefore, the motor noise should be low when working.

3. A good oxygen generator manufacturer should pass the ISO international and CE European quality system certification (oxygen machine), and pay attention to the brand of the oxygen generator which has been listed for more than two years, so as to have better quality assurance and relevant certification.

4. Strong oxygen production capacity. Better compressor 10-15 liters of air produced 1 increased concentration of oxygen, ordinary compressor 27-30 liters produced 1 increased concentration of oxygen.

5. It has the function of cumulative timing. It can count the service life of oxygen machine, so as to provide objective and accurate data for long-term maintenance and service in the future. According to the international standard, the oxygen generator should be equipped with cumulative timer, which is also the embodiment of product quality. The service life of a good oxygen generator should be able to guarantee tens of thousands of hours.