This table was reviewed on 14 July 2022 and refers to the ISO 17034 scope (Issue No. 003) and ISO 17025 scope (Issue No. 057) for EffecTech.

Primary Reference Gas Mixtures (PRGM)

All PRGM mixtures are issued with an ISO 17025 certificate.
Component Range ISO 17025 Calibration and Measurement Capability (CMC)*
  amount fraction (mol/mol) amount fraction (mol/mol)
carbon monoxide in nitrogen 10 ppm to 100 ppm 0.13 % relative + 0.3 ppm
100 ppm to 1000 ppm 0.40 % relative
carbon dioxide in nitrogen 0.1 % to 5 % 0.25 % + 7.5 ppm
5 to 15 % 0.10 % relative + 85 ppm
oxygen in nitrogen 10 ppm to 100 ppm 0.80 % relative + 0.1 ppm
100 ppm to 1000 ppm 0.45 % relative + 0.25 ppm
0.1 % to 1.0 % 0.35 % relative +0.5 ppm
1.0 % to 22.5 % 0.10 % relative + 15 ppm
nitric oxide in nitrogen 10 ppm to 60 ppm 0.10 % relative + 0.13 ppm
60 ppm to 600 ppm 0.20 % relative + 0.07 ppm
nitrogen dioxide in synthetic air 5 ppm to 500 ppm 2.0 % relative
sulphur dioxide in nitrogen 10 ppm to 200 ppm 0.10 % relative + 0.5 ppm
200 ppm to 1000 ppm 0.30 % relative + 0.1 ppm
methane in nitrogen 0.1 % to 2 % 0.18 % relative + 5 ppm
2 % to 5 % 0.10 % relative + 25 ppm
methane in synthetic air 0.1 % to 2 % 0.18 % relative + 5 ppm
2 % to 2.5 % 0.10 % relative + 25 ppm
propane in nitrogen 1 ppm to 1000 ppm 0.40 % relative + 0.05 ppm
0.1 % to 2 % 0.14 % relative + 2.6 ppm
propane in synthetic air 1 ppm to 1000 ppm 0.40 % relative + 0.05 ppm
0.1 % to 1.1 % 0.14 % relative + 2.6 ppm
* The calibration and measurement capability is based on a standard uncertainty multiplied by a coverage factor k=2, providing a level of confidence of approximately 95 %. The uncertainty evaluation has been carried out in accordance with UKAS requirements.

Certified Reference Materials (CRM)

All CRM mixtures are issued with a ISO 17034 certificate and an ISO 17025 certificate. To find out why, see our page on calibration gas certificates.
Component Range ISO 17025 Calibration and Measurement Capability (CMC)*
Binary emission gas mixtures Amount fraction (mol/mol) Amount fraction (mol/mol)
carbon monoxide in nitrogen or synthetic air 10 ppm to 100 ppm 0.25 % relative + 0.55 ppm
100 ppm to 1000 ppm 0.80 % relative
carbon dioxide in nitrogen or synthetic air 0.1 % to 5 % 0.50 % relative + 15 ppm
5 % to 15 % 0.20 % relative + 170 ppm
oxygen in nitrogen 0.5 % to 3 % 0.50 % relative + 85 ppm
3 % to 25 % 0.40 % relative + 100
nitric oxide in nitrogen 10 ppm to 60 ppm 0.20 % relative + 0.25 ppm
60 ppm to 600 ppm 0.40 % relative  + 0.13 ppm
nitrogen dioxide in synthetic air 5 ppm to 500 ppm 4.0 % relative
sulphur dioxide in nitrogen or synthetic air 10 ppm to 200 ppm 0.17 % relative + 1.0 ppm
200 ppm to 1000 ppm 0.60 % relative + 12 ppm
methane in nitrogen 0.1 % to 2 % 0.35 % relative + 10 ppm
2 % to 5 % 0.15 % relative + 50 ppm
methane in synthetic air 0.1 % to 2 % 0.35 % relative + 10 ppm
2 % to 2.5 % 0.15 % relative + 50 ppm
* The calibration and measurement capability is based on a standard uncertainty multiplied by a coverage factor k=2, providing a level of confidence of approximately 95 %. The uncertainty evaluation has been carried out in accordance with UKAS requirements.

Calibrated Gas Mixtures (CGM)

All CRM mixtures are issued with an ISO 17025 certificate.
Component Range ISO 17025 Calibration and Measurement Capability (CMC)*
Tertiary emission gas mixtures Amount fraction (mol/mol) Amount fraction (mol/mol)
nitric oxide 10 ppm to 60 ppm 0.20 % relative + 0.25 ppm
60 ppm to 600 ppm 0.40 % relative  + 0.13 ppm
nitrogen dioxide in nitrogen 5 ppm to 500 ppm 4.0 % relative
* The calibration and measurement capability is based on a standard uncertainty multiplied by a coverage factor k=2, providing a level of confidence of approximately 95 %. The uncertainty evaluation has been carried out in accordance with UKAS requirements.

ISO 17034 Continuous Emission Monitoring (CEM) mixture ranges

Why ISO 17034?