Stack PT Schemes  

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Round 22 of the Particulate Proficiency testing Scheme will be delayed by 2 - 3 months due to the Covid-19 (Coronavirus) outbreak and resulting restrictions on business practice. The proposed dispatch date for the scheme will be reviewed at the end of April. Registrations will remain open.


Proficiency Testing for the Stack Emissions Measurement Industry

NPL’s Emissions and Atmospheric Metrology Group organises a range of UKAS accredited (0016) proficiency testing (PT) schemes in the stack measurements area. NPL is a global leader in the provision of proficiency testing schemes; schemes are available in the areas of stack emissions, environmental radioactivity and gas metrology.

There are three stack emission PT schemes in operation:

  • Particulate Measurement
  • Gas Measurement and Gas Cylinder for Portable Emissions Measuring Systems

The Particulate scheme is run bi-annually in May and October with test items sent to participants.

The Gas Measurement and Gas Cylinder scheme will not run in 2020 due to the lack of participants. It is planned to run again in July 2021 if enough participants can be found.

A PT scheme provides a way of assessing the performance of laboratories by a series of regular inter-laboratory comparisons. Proficiency testing schemes are used by laboratory accreditation bodies as part of the process to assess the ability of laboratories to perform tests and measurements competently for which accreditation is held. UKAS policy on proficiency testing is laid out in their document: TPS 47- : TPS 47 'UKAS Policy on Participation in Proficiency Testing'. The policy states that “all accredited testing laboratories shall participate in PT/ILCs where such schemes are available and relevant to their scope of accreditation”. Participation in a proficiency testing scheme for stack monitoring is also strongly advised by the UK Environment Agency's Monitoring Certification Scheme (MCERTS).

NPL is working with the UK and Irish Regulators (EA, SEPA, NRW, DAERA-NI & EPA) to set up a steering and oversite committee to ensure that the PT Scheme is relevant to their regulatory requirements.

Schedules for the current rounds of each of the schemes can be found in the relevant section on the website.