PSA Oxygen Generator

PSA (Pressure Swing Adsorption) technology utilizes the high selectivity of zeolite molecular sieves for nitrogen adsorption. During the pressurization stage, nitrogen in the compressed air is adsorbed by the molecular sieve, and oxygen is enriched and output. During the depressurization stage, the molecular sieve releases nitrogen to complete regeneration. The system typically has two adsorption towers working alternately (one tower adsorbs and produces oxygen, while the other desorbs and regenerates), controlled by PLC to switch pneumatic valves, ensuring continuous oxygen supply.

The oxygen purity produced by PSA oxygen generation process is usually 93±3%. The remaining components are mainly argon. In industrial oxygen production, the argon content is 95%. The World Health Organization’s medical standard for PSA oxygen generators is an oxygen purity of 93%±3%. If 99% or higher purity oxygen is required, additional purification devices are needed.

• Temperature: The optimal operating temperature range is 4℃~27℃. High temperatures reduce adsorption efficiency, and low temperatures may affect the dew point of compressed air.
• Humidity: The inlet air dew point must be ≤4℃, otherwise a dryer needs to be installed. Refrigerated dryers can meet most scenarios, but desiccant types offer better performance with higher energy consumption.
• Altitude: At altitudes >1000 meters, compressor power needs to be increased by 15%~20% to compensate for the decrease in air density.

• Medical Standards: Must comply with ISO 7396-1 and CE medical certification, purity ≥93%±3% (argon content allowed). Some countries still follow old regulations requiring 99% purity, but the international trend is shifting towards accepting the 93% standard.
• Industrial Standards: Purity of 90%~93% is sufficient for metallurgy, chemical industry, etc., and costs are lower.

• Air Compressor Shutdown: Check if the temperature is too high, ambient temperature should be ≤40℃, voltage fluctuation should be controlled within ±10%.
• Low Oxygen Purity: Check if the solenoid/pneumatic valve is damaged, if the adsorption towers are working alternately, or if the oxygen analyzer is faulty.
• Molecular Sieve Failure: Immediately stop and replace, check if the pre-oil filter is faulty.