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BS EN 14181 is a European standard that encompasses the calibration, testing, and overall performance of Continuous Emissions Monitoring Systems (CEMS). Our team undertake annual EN 14181 maintenance and annual surveillance testing to ensure safe and compliant operations to all quality assurance levels. 

What is EN 14181?

EN 14181 describes the quality assurance procedures needed to ensure that CEMs - installed to measure emissions to atmosphere – comply with strict requirements related to uncertainty on measured values. There are 4 quality assurance levels defined in EN 14181, which are explained further down the page. 

Why choose ÌìÃÀ´«Ã½ for EN 14181 calibration and testing?

Our dedicated Emissions Monitoring Teams conduct more testing of this kind than anyone else in the UK or Ireland. With over 350 EN 14181 campaigns each year we have gained a massive amount of valuable, real-world, practical experience able to deal with every scenario that may arise.

Our vast experience in delivering CEMS measurements that are representative and accurate, gives you confidence that your CEMS is reliable and functioning to a high standard in order to comply with legislation. 

If a CEMS isn't performing accurately, our experts will source the issue and advise you on the best course of action. We offer training courses for detailed insight into best practice for the management of CEMS. Additionally, we offer Temporary CEMS solutions to eliminate the risk of non-compliance after an unexpected breakdown of your system. 

For more information and to speak with our experts, including Mark Elliott and James Eldridge, contact us today.

QAL1 

QAL1 uses pre-described criteria to prove that the total uncertainty of the CEMS meets the requirements and specifications and is fit for purpose.

The total uncertainty is calculated by summing together all the relevant uncertainty components arising from specific performance characteristics.

QAL2

QAL2 involves the use of EN ISO/IEC 17025 accredited testing laboratories, such as ÌìÃÀ´«Ã½, to produce a set of comparable data results alongside the operating CEMs.

This quality assurance procedure is used for the determination igf calibration functions, variability, and establishing calibration ranges applicable to the function.

Note - variability is a test of the measured values of the CEM against the maximum permissible uncertainty given by legislation.

QAL3

QAL3 demonstrates ongoing Quality Assurance and Quality Control of the CEMS. QAL3 is different from QAL2 and AST as it is conducted on a routine basis (e.g. weekly, fortnightly or monthly) usually by the operator to demonstrate the CEMS are under control and continues to function normally.

ASTs

Annual Systems Tests (ASTs) are conducted annually following any QAL2 and are generally considered a “mini QAL2”. AST determines whether the calibration functions established during the QAL2 remain valid and whether the associated range can be extended following a larger spread of data. Although similar to QAL2, AST ‘parallel measurements’ are reduced to a minimum of 5 over a minimum of 1 day. Whereas QAL2 requires a minimum of 15 ‘parallel measurements’ spread across 3 days.

EN 14181 Training Courses

We deliver tailored Training Courses either on your site, online or at one of our ÌìÃÀ´«Ã½ Laboratories. The course takes you through an EN 14181 campaign from start to finish, best practices around planning the testing, communications with CEMS manufacturers, the intricacies around the paired measurements, CEMS data, calibration functions and much more.

Linearity Checks

ÌìÃÀ´«Ã½s Centre of Technical Excellence teams regularly conduct Linearity checks to assess the linear performance of the CEM in accordance with EN 14181.  This is typically conducted at 2 x the Daily ELV (Emission Limit Value) or the Short Term ELV.   We hold ISO 17025 certified calibration gas with an uncertainty of < 2%.   The linearity measurements can sometimes be used as surrogate data to establish calibration functions.  The Linearity Checks are conducted by passing concentrations at zero, 20%, 40%, 60%, 80% of the range, and a final zero again. We also determine the T90 response time and various other checks required.

The ÌìÃÀ´«Ã½ advantage

ÌìÃÀ´«Ã½ are the No.1 supplier of ISO 17025 UKAS-MCERTS Accredited Air Emissions Testing in the UK & Ireland.  With our network of 12 offices, and nearly 50 teams, we have local experts ready to help you. Our unique advantages include:

• Safety Philosophy – We are proud of our safety record and zero-harm culture that is driven by every single member of the team
• Industry Leading Experts and MCERTS certified site teams to ensure the highest quality of testing
• Two dedicated workshops to calibrate, repair and performance check our large pool of sampling equipment, instruments and analysers.
• In-House ÌìÃÀ´«Ã½ Laboratories for analysis of samples including metals, mercury, dioxins & furans, acid gases and more.
• e-Mission digital portal to manage all aspects of your permit compliance including dynamically held emissions data to track and trend your results.