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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 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 Output^B				Air Consumption
Model^A	Flow^C		Max.Pressure Delivered		Average Flow^C		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.