מדחס לחץ נמוך + ממברנה לייצור ניטרוקס .

https://www.coltri.com/en/products/nitrox-compressors/

The LP300 ROTARY model consists of an industrial screw compressor that delivers air at a pressure of 12 bar to a membrane that separates nitrogen and oxygen up to a maximum percentage of 40% O2. The enriched air can be compressed at a pressure of 232 bar in combination with a high pressure compressor. The percentage of oxygen obtained at the outlet can be regulated from 22.4% to 40% using a valve directly accessible on top of the compressor. The oxygen analyser allows checking of the correct percentage adjusted by means of the appropriate valve.