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Continuous Emission Monitoring Systems (CEMS)

Continuous Emission Monitoring Systems (CEMS) are required to demonstrate compliance with the environmental legislation that applies to a process. For example, in Europe, processes previously falling under the Waste Incineration Directive 2000/76/EU (WID), Large Combustion Plant Directive 2001/80/EU (LCPD) and other industrial processes are now incorporated in the more recent Industrial Emission Directive 2010/75/EU (IED) under which processes must continuously monitor emissions to atmosphere.

For gaseous and particulate emissions these parameters are generally measured and reported in mg/m3. This serves the double purpose of proving that a plant’s emissions are below agreed emission limits and also provide the plant operator with feedback on the performance of arrestment plant, so that fault conditions can be quickly detected and emissions minimised.

High quality Continuous Emission Monitoring Systems (CEMS) should be used to ensure compliance. For Incineration, Large Combustion Plant and other industrial applications, to ensure credible measurements, to aid choice and determine the suitability of CEMs for measuring tasks the European standard EN14181 describes the quality assurance procedures needed to provide assurance that CEMs installed to measure emissions to air are capable of meeting the requirements relating to measured values as defined by applicable directives and regulations.

EN14181 is the performance standard applicable to monitoring equipment. There are three Quality Assurance Levels (QAL) within the standard and an annual check known as the Annual Surveillance Test (AST):

  1. QAL1 relates to the certification of the equipment. The performance standard used for certification of equipment is EN15267 parts 1, 2 and 3 published in 2009.
  2. QAL2 is the calibration against standard reference methods.
  3. QAL3 determines whether zero and span drift are within defined limits.
  4. Annual Surveillance Test (AST) provides additional yearly checks ensuring that monitoring equipment remains compliant.

FTIR sample probe with heated line on stackEN15267-3 certification provides confidence that the equipment selected to monitor emissions has been thoroughly tested by independent, nationally recognised, accredited bodies and meets standards that are accepted across Europe and the UK. There are two certification schemes: TUV and MCERTS. 

In the UK MCERTS certified systems are widely used, for more information please refer to the Environment Agency MCERTS performance standards and test procedures for continuous emission monitoring systems- June 2016 version 3.5.

The Environment Agency performance standard is based on EN15267-3 which was developed and recently updated to provide for the QAL1 and QAL3 requirements of EN 14181 and now provides a means of demonstrating compliance with the uncertainty requirements in applicable regulations. The uncertainty requirements are at least 25% below the requirements of EN14181 which provides sufficient margin for the uncertainty contribution from the individual installation of the CEM equipment that is necessary to pass QAL2 and QAL3 of EN 14181.

Based on the above requirements to reduce risk and costly mistakes when specifying and selecting CEMS please do remember to state the latest editions of each standard. For instance CEMS must be:

  1. MCERTS or TUV certified to EN15267-1, EN15267-2 and EN15267-3 (2009) with QAL1 as defined by EN14181 (2014).
  2. Have a certified range of 1.5 times emission limit value (ELV).
  3. Meet the uncertainty requirements of EN15267-3 (2009) for all parameters being measured.

As a manufacturer Gasmet used the above criteria as the minimum requirement when developing Continuous Emission Monitoring systems for Dry or non-condensing and Wet process streams typically found within the Incineration and Power sectors.

Quantitech is one of the UK’s leading providers of MCERTS approved CEMS. As a subsidiary of Gasmet, Quantitech is able to integrate Gasmet’s leading edge FTIR technology into CEMS systems, enabling operators to monitor multiple gases and other process parameters simultaneously.


Gasmet CEMS II eWhy choose Quantitech and Gasmet as your CEMS partner?

  • Reduced-risk equipment satisfies all regulatory requirements without any exceptions.
  • Save with minimal maintenance, operational costs and calibration.
  • Increased number of gases certified to future-proof your investment. With Gasmet FTIR, if there are additional requirements, new compounds can be added to the measurement setup without costly hardware changes.
  • Improved design - durable, rugged and dependable.
  • Gain longevity of investment with long lifetime expectancy.
  • Reputation for providing analytical expertise, supplying quality products and services. Including rental of equipment - responding to and helping many sites meet their monitoring obligations during difficult equipment downtime periods.

For more information

Telephone us on on +44 (0)1908 227722

Gasmet Technologies (UK) Limited
Woolleys Farm
Welford Road

Gasmet Technologies (UK) Limited is a subsidiary of Gasmet Technologies Oy

Tel: +44 (0)1908 227722
Fax: +44 (0)1908 227733

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