Krinner Drucklufttechnik GmbH
Friedrich-Bergius-Str. 15c
D-85662 Hohenbrunn near Munich

Phone: +49 8102 9919920
Mail: info(at)

Opening Hours
Mo: 07:30 – 16:45
Tu : 07:30 – 16:45
We: 07:30 – 16:45
Th: 07:30 – 16:45
Fr: 07:30 – 14:30
Nitrox membrane plants made in Germany

KrinnAir CO and CO2 Reducer for the Generation of NITROX Compliant with DIN EN 12021

The fully-automated, fully wired and encased CO2 compact system features a defined mode of operation that was not technically possible in the past. The combination of CO2 adsorption and regeneration by supplying nitrogen (available as a by-product of NITROX membrane systems) in particular is an innovation in breathing air generation.

Nitrogen is heated using a compressed air heater and is used for regeneration and drying of the desiccant.
The KrinnAir CO2 Reducer ensures extremely reliable CO2 reduction and drying of compressed air.

The result: an increase in the overall efficiency of NITROX generation while increasing the efficiency and service life of your NITROX membrane.


The best breathing air quality thanks to the KrinnAir CO2 reduction system

An integrated particle filter means you can look forward to a service life of up to 500 operating hours. The filter is validated and certified according to quality standard ISO 12.500-1:2007.

With the stand-alone version, this KrinnAir CO2 reduction system is universally useable. The CO2 Reducer can be connected using three flexible hoses.



Model Premium Line

Model Premium Line

Model Sport Line

Model Sport Line

Diagram: CO2 reduction

Diagram: CO2 reduction
1. Compressed air inlet: wet and oily 6. Compressed air heating
2. Compressed air preparation: drying and filtration 7. NITROX membrane
3. Compressed air outlet: dry and oil-free 8. NITROX connection, CO2 reduced
4. CO2 filtration 9. Nitrogen outlet
5. Pressure reduction 10. CO2 regeneration
  11. N2 / CO2 exhaust


CO2 Reducer – CO2 is adsorbed and reclaimed with nitrogen from the membrane

The pre-compressed air flows under pressure of 7 to 10 bar through the compressed air inlet (1) into the preparation system (2). The compressed air is dried and freed of oil. At the compressed air outlet (3), dry, oil-free compressed air is made available for CO2 processing and NITROX production.

The purified compressed air flows upwards through a container filled with desiccants (4). The drying agents are sufficiently sized to bind to the CO2 and thus adsorb the CO2 over a defined period of time. In parallel, regeneration takes place in the counter-flow of the second desiccant container (10). This is done using nitrogen (about 85%) that is available as residual gas from the NITROX oxygen membrane (9).

Professional compressed air production – CO2 is removed before NITROX generation

Before entering the NITROX membrane (7), the pressure is reduced (5) and the compressed air is heated (6). In the NITROX membrane, oxygen (8) and nitrogen (9) are separated within the hollow fibre membrane to a specific level in order to produce the desired NITROX breathing gas mixture according to DIN EN 12021.

In the final step, the residual nitrogen cleans the CO2-saturated desiccant. With a low residual pressure, the CO2 is reclaimed from the desiccant and discharged through the sound-suppressed exhaust (11).

The system can be integrated into any NITROX system and can be added at any time!

Model CO2-7,5 CO2-11 CO2-15
CO2 input max. 2000 ppm
CO2 output max. 500 ppm
Nitrox 21% - 40% 21% - 40% 21% - 40%
Volume delivered 200 – 320 litre/min 300 – 450 litre/min 450 – 600 litre/min
Volume flow 1100 litre/min 1650 litre/min 2500 litre/min
Operating pressure 7 – 10 bar 7 – 10 bar 7 – 10 bar
Electrical connection 230V/50Hz 230V/50Hz 230V/50Hz
Power consumption 0,1 KW 0,1 KW 0,1 KW


Additional CO reduction module

After CO2 reduction, the compressed air passes through a third container. Here carbon monoxide (CO) is oxidised by a catalyst bed and safely removed. The downstream fine-mesh filter retains any particles. The additional module is mounted laterally onto the CO2 Reducer and can be retrofitted at any time.

Model CO-7,5 CO-11  CO-15
CO output max. < 5 ppm
Nitrox 21% - 40% 21% - 40% 21% - 40%
Volume delivered 200 – 320 litre/min 300 – 450 litre/min 460 – 600 litre/min
Volume flow 1100 litre/min 1650 litre/min 2500 litre/min
Operating pressure 7 – 10 bar 7 – 10 bar 7 – 10 bar


Model CO Reducer

Model CO Reducer