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Environment

BOC is an active member of the Source Testing Association (STA) which keeps us at the forefront of emissions monitoring standards in the UK. This ensures that our knowledge of the industry and the directives that govern it is kept up to date so we are better placed to support our customers.

BOC is accredited to ISO 17025 as a calibration laboratory and as such can produce a range of accredited gas standards for use in QAL 2 and AST (Annual Surveillance Testing) specified under BS EN 14181 and MCerts. In addition to this BOC is accredited as a reference material producer under ISO Guide 34.

MCerts: The Environment Agency’s Monitoring and Certification Scheme. MCerts sets out the framework for meeting the quality requirements of emissions monitoring and covers all aspects including instrumentation, individuals and laboratories.

Continuous Emissions Monitoring

BS EN 14181 is in place to ensure that continuous emissions monitoring systems are working correctly and within the allowed uncertainty for all machines in use. BOC can provide calibration gases at each stage of testing:

QAL 1

• Covered by BS EN 15267 rather than BS EN 14181
• Carried out to ensure that the CEM (Continuous Emissions Monitor) is suitable for the intended use BEFORE it is installed via MCerts Product Certification
• Ensures the correct measurement range for application
• BOC provides Beta certificate gas mixtures with analytical uncertainty of +/-2

QAL 2

•  Calibration of the CEM against analytical methods applied by a test organisation accredited to ISO 17025, and recognised under MCerts.
• Measurements are taken using standard reference methods
• Carried out when: CEM is installed
• Every 3 years (under Waste Incineration Directive) 5 years (under Large Combustion Plant Directive)
• Significant change in Plant Operation
• After CEM failure
• BOC provides ISO 17025 accredited gas standards

QAL 3

• Ensures the CEM remains within the required specifications
• Requires regular checks of zero and span gas readings
• BOC provides Beta certificate gas mixtures with analytical uncertainty of +/-2% and ISO 17025 accredited gas standards for CEM re-calibration if required

AST

• Similar to QAL 2, verifies that the calibration of the CEM is still valid and within the required limits. Generally carried out by a test organisation accredited to ISO 17025, and recognised under MCerts.
• BOC provides ISO 17025 accredited gas standards

Ambient Air Quality

BOC provide gases for use in Air quality monitoring with analytical uncertainties up to +/-1%. This uncertainty is coupled with our SPECTRA-SEAL treatment process to guarantee a 3 year shelf life on low level mixtures such as:

• 20ppm Carbon Monoxide (CO) balance Nitrogen (N2)
• 450ppb Nitric Oxide (NO) balance Nitrogen (N2)
• 450ppb Nitrogen Dioxide (NO2) balance Air
• 450ppb Sulphur Dioxide (SO2) balance Air

If needed, we can also have the gas mixture certified by the National Physical Laboratory (NPL) for increased traceability before it is sent out to you. An NPL certificate offers the same certification as is applied to the standards that the Environment Agency use in AURN (Automatic Urban and Rural Network) for purposes such as reporting against EU Commission Air Quality Directives.