If you operate a breathing air compressor in the UK, ensuring air quality compliance isn’t optional - it’s a legal and safety-critical requirement. From diving operations to industrial breathing apparatus, regular breathing air testing is essential to protect personnel and meet regulatory standards such as BS EN 12021:2014.
UK Legal Requirements for Breathing Air Testing
Under guidance from the Health and Safety Executive (HSE), breathing air used for respiratory protection must be clean, safe, and tested regularly.
HSE best practice recommends that compressed breathing air is tested:
- At least every three months (quarterly)
- More frequently where contamination risks are higher
Failure to comply can expose businesses to serious health risks, legal consequences, and operational downtime.
What is EN12021?
BS EN 12021:2014 is the European standard that defines the quality requirements for compressed breathing air.
It sets strict limits for:
- Oxygen levels (~21%)
- Carbon monoxide (CO)
- Carbon dioxide (CO₂)
- Oil mist and vapour
- Water content and dew point
- Odour and taste
Meeting EN12021 ensures that breathing air is safe for human use and free from harmful contaminants.
Why Breathing Air Testing is Critical?
Even well-maintained compressors can introduce dangerous contaminants into the air supply.
Common sources include:
- Vehicle exhaust fumes near intake points
- Oil carryover from compressor systems
- Moisture leading to corrosion or bacteria
- Degraded or saturated filtration systems
Critically, gases like carbon monoxide are colourless and odourless, making testing the only reliable method of detection.
Breathing Air Testing Equipment Options
Choosing the right testing method depends on your operation, risk level, and budget.
Lower-Cost Option: Air care Test Kit (P/N 5700)
The Undersea Air Care Breathing Air Test Kit (Part Number 5700) is a practical and cost-effective solution for routine compliance testing.
Ideal for:
- SMEs and smaller diving operations
- Periodic in-house testing
- Backup verification
Key benefits include portability, ease of use, and the ability to test for core contaminants in line with EN12021.
Mid-Range Option: Dräger Simultan Systems
Dräger Simultan systems offer enhanced multi-gas detection with improved accuracy and repeatability.
Best suited for:
- Regular operational testing
- Higher-risk environments
- Businesses requiring more robust reporting
Premium Option: Advanced Multi-Gas Analysis Systems
At the top end, you’re looking at fully integrated multi-gas analysis systems that provide deeper insight and, in some cases, continuous monitoring.
Examples include:
- Factair Safe-Air and Multi-Air testers (EN12021 compliant with digital logging and sensors for multiple gases)
- Aerotecnica Coltri Multi-Gas Analysis Systems, designed specifically for breathing air compressor applications
These systems typically offer:
- Real-time air quality readings
- Digital reporting and data logging
- Multi-gas detection in a single unit
- Higher accuracy and repeatability
They’re ideal for:
- Commercial dive operations
- Offshore / high-risk environments
- Businesses where compliance needs to be watertight
Laboratory Testing (Mass Spectrometry)
For the highest level of accuracy, air samples can be sent to specialist laboratories for mass spectrometry analysis.
This provides:
- Detailed identification of trace contaminants
- Independent certification of air quality
- Additional assurance for audits or investigations
It is commonly used alongside on-site testing as part of a complete compliance strategy.
On-Site Breathing Air Testing Services
If you prefer not to manage testing internally, Melnic Marine offers a professional on-site breathing air testing service across the UK.
A qualified technician can attend your site to:
- Carry out compliant air quality testing
- Verify results against EN12021 standards
- Provide documented reports for HSE compliance
- Identify potential issues with your compressor system
This is the most reliable way to ensure accuracy, reduce risk, and maintain full compliance without internal resource burden.
How Often Should You Test?
As a guideline:
- Minimum: Quarterly (every 3 months)
- After compressor relocation or maintenance
- When operating conditions change
- If contamination is suspected
Regular testing, combined with proper maintenance, is key to safe operation.
Why Choose Melnic Marine?
Melnic Marine supports operators across the UK with both breathing air testing equipment supply and on-site services.
We can help you:
- Select the right testing solution for your budget
- Supply trusted equipment such as the Air Care Test Kit (P/N 5700)
- Deliver on-site testing through experienced technicians
- Maintain compliance with HSE and EN12021 requirements
Get in touch today to discuss your requirements and ensure your breathing air systems remain safe, compliant, and fully operational.