EffecTech’s Stack Emissions Proficiency Testing Scheme has been described as “excellent all round” and has participants in the UK and Ireland as well as in the rest of Europe and Asia.
2026 SEPTS scheme
- The 2026 SEPTS scheme is now open for applications until 30 March
- SEPTS instructions to Participants
- Participants are required to register for the scheme using the enrolment form and indicate the mixtures they wish to participate in.
- Click here to download (GBP) [.docx]
- Click here to download (EUR) [.docx]
- Can’t take part in SEPTS this year? You could participate in an on-demand proficiency testing scheme, in which gas mixtures are provided for ‘blind’ measurement. On-demand schemes are available for sulphur, hydrocarbons and emissions testing.
For more information, please contact us
More information about SEPTS
The 2025 SEPTS report can be downloaded here:
SEPTS Final Report 2025
| Mixture types | Amount fraction range (%mol/mol) |
| oxygen in nitrogen | 2 to 14 |
| carbon dioxide in nitrogen | 1 to 10 |
| Mixture types | Amount fraction range (μmol/mol) | |
| sulphur dioxide in nitrogen | 10 to 200 | |
| propane in 10% oxygen / nitrogen | 5 to 50 | |
| nitric oxide in nitrogen | 10 to 500 | |
| carbon monoxide in nitrogen | 20 to 500 | |
| NO/NO2 in nitrogen | Nitric oxide (NO) | 20 to 400 |
| Nitrogen oxides (NOx) | 25 to 500 | |
Reporting
Participants are required to report the composition and an estimate of the uncertainty of the gas where appropriate using the reporting template.
Evaluation
Evaluation will be using ISO 17043 approved methods including En ratio and Z scores.
Confidentiality
As mandated by ISO 17043, all data including participants and performance will be kept strictly confidential. Only the submitting laboratory will receive feedback on their performance. Performance data will be reported to the whole group anonymously.
Want to sign up to a proficiency testing scheme?
GGLNG for the Natural Gas and LNG industry | SEPTS for companies that provide stack testing services
