PureAir – The certification for safe breathing air

Breathing air is the most important item of equipment, the basic the basic requirement for a safe diving pleasure.

Riffs in all their coloured splendour, mellow slopes, steep faces and floorless drop-offs – many divers just simply wish to have pleasure in experiencing the incomparable underwater world of plants and creatures and to enjoy a carefree holiday.

However, for your own safety it is of the utmost importance to be aware of the risks. Even experienced divers do often not recognize or even neglect the dangers which may arise due to contaminated air.

BAUER PureAir for breathing

Insufficiently or even non-filtered air from the compressor may jeopardize the health and even the life of any sports diver. Many divers put themselves at considerable risk by insufficiently inspecting the quality of breathing air. Risks are played down in order to save costs although these savings often turn out to be insignificant or even completely negligible.

The PureAir standard gives scuba diving enthusiasts a sense of safety, as we only award the exclusive seal of approval to companies with BAUER breathing air compressors, which deliver the highest quality of breathing air. The exclusive BAUER PureAir seal makes sure that any diver really receives pure breathing air according to the European Standards.

BAUER PureAir stations must meet strict requirements

Certification is world-wide done through authorized BAUER partners only due to whom BAUER KOMPRESSOREN is able to ensure that the required know-how is properly passed on and that installations and operators are audited by nothing but experts.
BAUER partners inspect the air quality before awarding certification which is mandatory to be repeated every twelve months.

Breathing air quality measurement comprises measurement of the water content as well as the remaining concentrations of carbon monoxide, carbon dioxide and oil according to the stringent standard DIN EN 12021:20141.

Certified BAUER PureAir stations must operate BAUER high pressure breathing air compressors which are equipped with the BAUER electronic filter saturation control SECURUS which avoids delays and incorrect exchanges of filter cartridges thus eliminating a main source for contaminated air.

The BAUER PureAir certificate ensures more safety for divers and plant operators. The use of modern equipment and original accessories and the continuous inspection and maintenance of the system ensure a consistently high quality standard. Feel good – you can breathe freely and safely!

1 Residual oil measurement based on volatile organic compounds (VOCs) only. Sensor calibration based on isobutene.


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of O, CO, CO, absolute humidity as well as VOC content¹

  • Dräger AEROTEST

of O, CO, CO, absolute humidity as well as VOC content¹

    Integrated into the compressor or standalone version, sensors report automatically scheduled calibration and end of their life.


To provide the very highest level of reliability, we have now introduced PureAir Gold. This new safety level proves to your customers that you use BAUER’s new B-DETECTION PLUS Online Gas Measurement System, and that you seamlessly monitor the quality of your breathing air throughout your operations in compliance with the DIN EN 12021:20141 Breathing Air Standard.

Allowing you to rely on flawless top-quality breathing air in every cylinder.

1 Residual oil measurement based on volatile organic compounds (VOCs) only. Sensor calibration based on isobutene.

Why contaminated breathing air is so dangerous


In case humidity is not completely removed from the compressed air it can lead to corroding metal components in breathing equipment or diving cylinders from the inside. In addition the breathing regulator may ice over when diving in colder waters, thus becoming life threatening situation. The humidity and the coldness produced whilst compressed air is expanding may cause seizure of the 1st stage (pressure reducer) of the breathing regulator due to icing over which may result in uncontrolled blowing or even complete interruption of the air supply.
(DIN EN 12021:2014 requirement: < 25 mg/m3)


In case residual oil in the breathing air is distinctly above the limit value, then the diver notices an oily or stale taste. In addition to acute irritation with coughing and breathing difficulties, nausea and vomiting are likely to occur. The oily mixture can form a permanent deposit in the lungs and thus damage the tissue when frequently inhaled.

Carbon monoxide

Particularly dangerous is the odorless and tasteless carbon monoxide (CO). CO stops the bond of oxygen to the blood, thus causing an insufficient transport of oxygen towards all vital organs. This can and will cause headache, dizziness, nausea, unconsciousness and even heart failure. Even breathing in small doses under 0.01 vol.% (100 ppm) may cause chronic illness of the heart and nerves. Doses of 0.1 vol.% (1000 ppm) and higher are fatal after prolonged inhalation.

Carbon dioxide

Carbon dioxide is a natural component of air in very small concentrations. However, in higher doses it leads to breathing limitation and even respiratory arrest. The air breathed in containing too high concentrations of carbon dioxide accelerates heartbeat, increases blood pressure and causes shortness of breath and unconsciousness from a concentration of approximately 5 vol.% (50.000 ppm). Concentrations from 8 vol.% (80.000 ppm) can and will lead to lethal consequences within 30 to 60 minutes.


Outstanding quality and continuous monitoring: BAUER KOMPRESSOREN never makes any compromises concerning the safety and health of divers.



For complete certainty, the only solution is to monitor breathing air continuously and seamlessly to verify compliance with the DIN EN 12021:2014 Breathing Air Standard. To achieve this, BAUER developed the B-DETECTION PLUS Online Gas Measurement System.


B-DETECTION PLUS measures CO, CO2 and O2 as standard and offers options for absolute moisture and residual oil (VOC)1. Automatic, continuous and ultra-reliable. The B-CONTROL control unit allows compliance with the threshold limits set forth in the Breathing Air Standard to be monitored at all times. If limit values are exceeded, B-CONTROL displays a visual warning and shuts down the system before contaminated air can pass into the cylinders being filled. In cases where limit values are briefly exceeded, an automatic flush valve (optional) discharges contaminated air to the outside without interrupting operation of the system unnecessarily.

To ensure highly accurate measurement results, BAUER uses high-quality temperature and pressure compensating sensors.

B-DETECTION PLUS i and s are the stationary models of the gas measurement system. Whether factory integrated (B-DETECTION PLUS i) or as a standalone model (B-DETECTION PLUS s) the system continuously monitors the quality of your breathing air.

1 Absolute humidity and residual oil (VOC)  monitoring optional. Residual oil measurement based on volatile organic compounds (VOCs) only. Sensor calibration based on isobutene.


For mobile safety BAUER offers the portable version B-DETECTION PLUS m. The compact, portable all-in-one solution gives you the freedom to perform reliable breathing air measurement wherever and whenever you need to.

B-DETECTION PLUS m can measure breathing air directly from the cylinder or filling station as well as ambient air before it enters the compressor. Powered by an (optional) rechargeable battery, it is ready for use anywhere and anytime – no need for external power sources. The housing offers IP65-rated protection against dust and water jets, enabling the B-DETECTION PLUS m to be used even in the harshest weather conditions.

Like the stationary models, the B-DETECTION PLUS m delivers completely reliable, ultra-precise readings to monitor compliance with DIN EN 12021 limits for CO, CO2, O2 and – optionally – absolute humidity and total oil values (VOC)1.

1 Absolute humidity and oil (VOC) monitoring optional. Oil measurement based only on volatile organic compounds (VOCs). Sensor calibration based on isobutene.


Effectively limiting CO2 levels in breathing air

Unfavourable environmental influences are responsible for permanently rising CO2 concentrations in the air. As a result, operators of breathing air filling stations are experiencing increasing problems in complying with the mandatory threshold limits specified in the DIN EN 12021:2014 Breathing Air Standard.
AERO-GUARD is the reliable way to ensure that CO2 levels in compressed breathing air never exceed the permissible limit.
To do this, the system uses a sophisticated bypass system which routes the air from the compressor intake through the AERO-GUARD before it is compressed. Part of this air passes through a special filter cartridge, reducing its CO2 content to around one-third of that of the intake air – far lower than even the strict limits set forth in the Breathing Air Standard¹.

1 Provided the maximum CO2 concentration of the air at intake is not exceeded.

BAUER purification systems

Purification is of eminent importance in perspective to health protection. Without proper purification remainders of oil, water, carbon monoxide and carbon dioxide will contaminate the compressed air. It therefore is most obvious that the purification system is the all decisive factor in processing breathing air. All BAUER high pressure breathing air compressors are equipped with field-proven purification systems. These purification systems provide for the use of genuine BAUER filter cartridges a reliable breathing air purification in accordance with DIN EN 12021:20141. These purification systems eliminate humidity and residual oil in the compressed breathing air. Furthermore, filter cartridges as applied on all BAUER high pressure breathing air compressors with combustion engines (either petrol or diesel) additionally convert carbon monoxide into harmless carbon dioxide by means of a special catalyst.

1 Only with BAUER special filter cartridge with hopcalite up to a maximum concentration of 25 ppm CO in intake air. The compressed clean breathing air then contains a maximum level of 5 ppm CO.  The CO2 content in the intake air must not exceed the maximum permitted value according to DIN EN 12021: 2014! Local MAK values are not taken into account.
B-SECURUS Filterüberwachung

B-SECURUS Filter monitoring system

Even the slightest risk is too high. Therefore, each BAUER PureAir station must be equipped with B-SECURUS, the filter monitoring system from BAUER or a drew point sensor in case of online air quality measurement.
The filter cartridge shall be handled correctly and exchanged on time. The BAUER electronic filter cartridge saturation control SECURUS continuously monitors the saturation of the filter cartridge by moisture which is actually measured inside the filter cartridge. Furthermore, SECURUS gives warning prior to cartridge exchange and automatically shuts down the compressor installation as soon as the cartridge is saturated by moisture prior to being exchanged. This ensures that the filtering of the cartridge works optimally at all times, reliably avoiding overrunning the life of the cartridge.
SECURUS therefore secures purity of the breathing air, optimum use of the filter cartridge life span as well as user safety.

PureAir stations worldwide

The map shows you all the filling centres which are certified as official BAUER PureAir Stations.

The navigator on the left enables you to zoom in or out on the map. In order to change from one section of the map to another section simply click on the map and drag the cursor in the required direction. Should you require more information about a particular filling centre, just click on the corresponding marker flag.

Stations which have a PureAir Gold status, in which a continuous measurement of oxygen, carbon monoxide, carbon dioxide, oil1 and moisture, can be recognized by clicking on the “Gold certified” logo.

1 Residual oil measurement based on volatile organic compounds (VOCs) only. Sensor calibration based on isobutene.

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