This table was reviewed on 26 February 2020, and refers to the scope for EffecTech in the UK only (Issue No. 052).

For the most up-to-date information, as well as the scopes for EffecTech Gases PvT Ltd (India) and EffecTech Qatar, see EffecTech’s ISO 17025 scope.

Primary Reference Gas Mixtures Secondary Reference Gas Mixtures
component range calibration and measurement capability (CMC)* range calibration and measurement capability (CMC)*
amount fraction (ppm mol/mol) amount fraction (ppm mol/mol) amount fraction (ppm mol/mol) amount fraction (ppm mol/mol)
hydrogen sulphide 0.2 to 2 0.03 0.2 to 10 2 % relative + 0.03
2 to 200 1 % relative + 0.01
carbonyl sulphide 0.2 to 2 0.03 0.2 to 10 2 % relative + 0.03
2 to 200 1 % relative + 0.01
methanethiol (methyl mercaptan) 0.2 to 2 0.03 0.2 to 10 2 % relative + 0.03
2 to 200 1 % relative + 0.01
ethanethiol (ethyl mercaptan) 0.2 to 2 0.03 0.2 to 10 2 % relative + 0.03
2 to 200 1 % relative + 0.01
dimethyl sulphide 0.2 to 2 0.03 0.2 to 10 2 % relative + 0.03
2 to 200 1 % relative + 0.01
1-propanethiol (n-propyl mercaptan) N/A N/A 0.2 to 10 4 % relative + 0.03
2-propanethiol (iso-propyl mercaptan) 0.2 to 2 0.03 0.2 to 10 2 % relative + 0.03
2 to 200 1 % relative + 0.01
ethyl methyl sulphide (methyl ethyl sulphide) 0.2 to 2 0.03 0.2 to 10 2 % relative + 0.03
2 to 200 1 % relative + 0.01
1-butanethiol (n-butyl mercaptan) N/A N/A 0.2 to 10 4 % relative + 0.03
2-methyl-2-propanethiol (tert-butyl mercaptan) 0.2 to 2 0.03 0.2 to 10 2 % relative + 0.03
2 to 200 1 % relative + 0.01
2-methyl-1-propanethiol (iso-butyl mercaptan) N/A N/A 0.2 to 10 4 % relative + 0.03
1-methyl-1-propanethiol (sec-butyl mercaptan) N/A N/A 0.2 to 10 4 % relative + 0.03
diethyl sulphide 0.2 to 2 0.03 0.2 to 10 2 % relative + 0.03
2 to 200 1 % relative + 0.01
n-hexyl mercaptan N/A N/A 0.2 to 10 4 % relative + 0.03
tetrahydrothiophene (THT) 0.2 to 2 0.03 0.2 to 10 2 % relative + 0.03
2 to 200 1 % relative + 0.01
* 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