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PSA Oxygen Generators

PSA oxygen generators are Pressure Swing Absorption units, the equipment comprises of an air compressor delivering air at approximately 7 bar pressure.  The air must be free from oil and dust contamination,  it must have a low humidity and temperature below 40 degrees centigrade.

The pressurised clean air enters one of the PSA columns, the column contains a synthetic zeolite that acts as a molecular sieve.  In effect the sieve separates the oxygen from the nitrogen. After a few seconds or minutes, a solenoid valve activates and the pressurised cylinder evacuates, and the second cylinder of zeolites is pressurised. The process keeps repeating,  hence the name Pressure Swing.

The out-put pressure from PSA units is approximately 3 bar or 45 psi,   this pressure is sufficient to drive the Dryden Aqua ceramic oxygen diffusers (diffusers require 30 to 50 psi pressure).

Oxygen generators table of production

Oxygen generator code   Air flow required Ncubm/min discharge pressure

psi

 litres per minute oxygen produced approx. weight g per minute of oxygen * approx. litres per hour of oxygen approx. weight g per hour of oxygen *
6.7.55 workhorse 15 compressor included 5 7 10 420 600
6.7.201 AS-12 compressor included 35 5 7 300 428
6.7.202 2 x AS-12 compressor included 35 11 15.7 660 942
6.7.203 3 x AS-12 compressor included 35 16 22.9 960 1371
6.7.204 4 x AS-12 compressor included 35 22 31.4 1320 1885
6.7.21 AS-20 0.14   9 13 540 771
6.7.22 AS-45 0.29   20 20.6 1200 1,714
6.7.23 AS-80 0.47   35 50 2100 3,000
6.7.24 AS-160 0.81   70 100 4200 6,000
6.7.25 AS-250 1.23   110 157 6600 9,428
6.7.26 AS-450 2.18   190 271 11400 16,285

* The weight of oxygen can be up to 10% lower than the figures in the table above.

Specifications
Oyxgen OutputB Air Consumption
ModelA FlowC Max.Pressure
Delivered		 Average
FlowC		 Min.Pressure
Required
SCF/hr nm3/hr psig kPa SCF.min NM3.min psig kPa
AS-20 20 0.53 45 310 5.3 0.14 90 620
AS-45 45 1.18 45 310 11.0 0.29 90 620
AS-80 80 2.10 45 310 20.0 0.53 90 620
AS-160 160 4.21 45 310 31.0 0.82 90 620
AS-250 250 6.57 45 310 46.7 1.23 90 620
AS-450 450 11.83 45 310 83.3 2.19 90 620
AS-1000 1,000 26.29 45 310 210.0 5.52 90 620
AS-1250 1,250 32.86 45 310 260.0 6.84 90 620
AS-1500 1,500 39.44 45 310 315.0 8.28 90 620
AS-2000 2,000 52.58 45 310 420.0 11.04 90 620
AS-3000 3,000 78.88 45 310 630.0 16.56 90 620
AS-4000 4,000 105.17 45 310 840.0 22.08 90 620
AS-5000 5,000 131.47 45 310 1050.0 27.6 90 620
A. Available in 120 VAC/60 Hz or 220 VAC/50 Hz.
     A 60 gallon oxygen receiver weighing 145 lb (65.8 kg)
     is shipped separately with the AS-20 thru AS-160.
     A 120-gallon oxygen receiver weighing 275 lb
     (124.7kg) is shipped separately with the AS-250 &
     AS-450.  Call factory regarding other models.
B. All models generate up to 95% pure oxygen with
     a dew point  of -1000F(-730C).
     Generators require factory modification to deliver
     oxygen at purities below 90%.
C. SCF (standard cubic foot) gas measured at
     1 atmosphere and 700F.
     Nm3 (normal cubic meter) gas measured at
     1 atmosphere and 700F.