Oxygen Concentrator

Oxygen generation method: PSA (Pressure Swing Adsorption); Inhalation: nasal suction, headset-style; Rated power: 140W;

Product Features:Oxygen generation method: PSA (Pressure Swing Adsorption);Inhalation: nasal suction, headset-style;Rated power: 140W;Rated voltage: 220V ± 30V;Rated Current: 0.64A;Current Frequency: 50HZ;Oxygen purity: (room temperature, 1Mpa) 30-90% adjustable;Oxygen flow :1-5 L/Min adjustable;Working time :1-2 hours;Running noise: ≤ 45dB;Oxygen pressure :0.01-0 .03 Mpa;Size: 331 * 171 * 297mm;Net Weight: 5.8KG; Accessories: oxygen breathing apparatus                          ear loop \ input tube \ nasal oxygen tube suction.

Product description:

Air consists mainly of nitrogen at about 78% with oxygen at 21%, there being trace gases such as argon. The basic principle is the removal of nitrogen from air by its adsorption by a molecular sieve, leaving the oxygen available for use. This is achieved by compressing air which is passed through a “zeolite tower” filled with aluminium silicate (Figs 2 & 3). Nitrogen is adsorbed onto these granules, a reversible reaction and not a chemical reaction (as occurs between carbon dioxide & soda-lime). The resulting gas that flows out from the tower contains about 93% oxygen. As the zeolite tower becomes quickly saturated by nitrogen within a few seconds, the system switches to a second zeolite tower to maintain a constant flow of oxygen. At this point, the first tower is vented to atmosphere and the adsorbed nitrogen is quickly released and expelled. As quickly as it became saturated with nitrogen so the granules release the nitrogen and become fully capable of adsorbing nitrogen once again. Thus all that is required are two towers which regularly switch from one to the other to keep up a steady flow of oxygen. A small reservoir tank downstream of the towers stores enough oxygen for several minutes. The electrical power consumption is low at 300-400 watts.

Once the technology was available commercially, the purpose of the WHO committee on oxygen concentrators (the author being a member) was to define a standard for the specifications required for reliability and maintenance. Since oxygen concentrators have an obvious practical value in less sophisticated or remote environments and for military use, the standards set were rigorous including robustness and being dropped from a aeroplane! Since this committee met, the manufacturers of better quality oxygen concentrators have improved significantly to meet these high standards. They are now small and quiet, reliable and need little maintenance and include an alarm which is triggered if oxygen concentration falls or the system fails in any way. Thus an investment in a better quality concentrator is likely to provide years of safe and reliable service.

There are many manufacturers of concentrators; they all perform the same function but, like cars, cheaper models don’t all last as long and are less reliable. The “Free-ox” machine includes a Devilbiss KS concentrator, a top range model from a company with a high worldwide reputation. This concentrator is well built and has a larger compressor than others, so that it works with less wear-and-tear and importantly makes very little noise. Rotary valves (compared to cylinder-in-sleeve type) are more reliable and less likely to stick. It provides easy access to filters which need occasional cleaning. The first minor filter change service for the Devilbiss KS concentrator is around 8000 hours, which, if the vet end-user surgical operating hours are calculated, works out at quite a few years! The first major service (changing the zeolite towers) is at about 25,000 hours – a lifetime of operating! Although twice the price of cheaper models, the main criteria why the Devilbiss concentrator is supplied with the “Free-Ox” anaesthesia and critical care machine is its reputation for reliability, durability, quiet function and easy maintenance.