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Oxygen generators - on-site oxygen production from compressed air
An oxygen generator produces oxygen on site, directly from compressed air. It uses PSA technology with zeolite molecular sieves and delivers oxygen at a typical purity of 90, 93 or 95 percent, with outputs ranging from a fraction of an Nm³/h to hundreds of Nm³/h.
Modern Tech Group selects, installs, commissions and services complete oxygen generator systems: from the compressor through drying and filtration to the generator and oxygen receiver. We offer Hertz Kompressoren HOX series oxygen generators with purities of 90, 93 and 95 percent.
Important: we deal exclusively with technical oxygen for industrial applications. We do not supply medical oxygen.
How a PSA oxygen generator works
A PSA oxygen generator (pressure swing adsorption) has two beds filled with zeolite molecular sieve. Under pressure, the zeolite adsorbs nitrogen from the air, while oxygen passes into the receiver. Unlike a nitrogen generator, which uses CMS carbon molecular sieves to retain oxygen, this bed retains nitrogen.
When the bed in one column becomes saturated, the column is depressurised, nitrogen is released into the atmosphere and the second column takes over. Alternating operation of the two beds ensures continuous oxygen production.
| Parameter | PSA oxygen generator | PSA nitrogen generator |
|---|---|---|
| Adsorbent bed | zeolite molecular sieve | CMS carbon molecular sieve |
| Adsorbed gas | nitrogen | oxygen |
| Typical purities | 90, 93 and 95% | 95 to 99,999% |
Oxygen purity by application
We match oxygen purity to the process. Typical ranges:
| Application | Typical O₂ purity |
|---|---|
| Ozonation and water treatment | 90 to 93% |
| Wastewater treatment plants | 90 to 93% |
| Aquaculture and fish farming | 90 to 93% |
| Cutting and welding | 93 to 95% |
| Glass industry | 93 to 95% |
| Biogas plants | 90 to 93% |
There is no benefit in specifying higher purity than the process requires: every increase means more compressed air and energy consumption.
Oxygen generator or cylinders and liquid oxygen
Oxygen from an on-site generator typically costs only a fraction of cylinder oxygen, with a typical payback period of 1 to 3 years. Additional benefits:
- no cylinder and delivery logistics: ordering, replacement or changeover downtime
- no evaporation losses typical of liquid oxygen storage
- production continuity: oxygen is available whenever the compressor is running.
We prepare a specific calculation for your plant based on consumption, required purity and energy prices.
System layout and feed air requirements
A complete oxygen production system consists of the following components:
screw compressor → air receiver → dryer → coalescing and activated carbon filtration → oxygen generator → oxygen receiver
Feed air must meet ISO 8573-1 requirements for oil, moisture and solid particles, as with nitrogen generators. Oil and moisture shorten the life of the zeolite bed. We build air treatment systems using components including BEKO Technologies: CLEARPOINT, DRYPOINT, BEKOMAT.
- Coalescing filter retains oil aerosols, water and solid particles.
- Activated carbon filter removes oil vapour.
- Dryer lowers the dew point and protects the bed.
- Oxygen measurement enables continuous monitoring of gas purity.
Oxygen system safety
Oxygen strongly supports combustion. Fittings, piping and components of an oxygen system must be degreased and rated for oxygen service. Standard compressed air system components must not be used in it.
Read more about air treatment on our page compressed air filtration.
Hertz HOX series
Oxygen output in m³/h (manufacturer data)
| Model | O₂ at 90% | at 93% | at 95% | Air demand at 90% |
|---|---|---|---|---|
| HOX-25 | 0,25 | 0,23 | 0,21 | 2,8 |
| HOX-120 | 1,3 | 1,16 | 1,09 | 14,3 |
| HOX-1900 | 21,2 | 18,9 | 17,7 | 233 |
| HOX-21600 | 240 | 215 | 201 | 2646 |
The HOX series comprises 26 models. We select a generator matched to your oxygen consumption.
Oxygen generator servicing
Regular servicing maintains oxygen purity and output. Our inspections include:
- periodic inspections and checks of oxygen purity and output
- replacement of zeolite beds
- replacement of coalescing and activated carbon filter elements
- oxygen sensor calibration.
We service oxygen generators from various manufacturers and air treatment systems. See also compressed air dryer servicing.
What to include in an oxygen generator selection enquiry
- required oxygen purity or application
- oxygen consumption in Nm³/h and daily profile
- required oxygen pressure
- existing compressor and dryer
- installation location.
Oxygen generators - frequently asked questions
Need an oxygen generator or servicing?
Describe your application and oxygen consumption, and we will prepare a selection proposal.
Related services
- Nitrogen generatorsSelection, installation and servicing of PSA and membrane nitrogen generators.
- Compressed air systemsDesign and installation of piping networks.
- Compressed air dryersServicing of refrigeration and adsorption dryers.
- Compressed air filtrationCoalescing and activated carbon filters, ISO 8573-1 classes.
- Compressed air auditsMeasurement of compressor station output and energy consumption.
- Screw compressorsGuide to selecting a feed air compressor.
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ul. Słowackiego 201 26-600 Radom Mazovian Voivodeship, Poland