1.1 ,This test method covers a rapid and simple field determination of carbon dioxide in natural gas pipelines. Available detector tubes provide a total measuring range of 100 ppm (parts per million) up to 60 ,% by volume, although the majority of applications will be on the lower end of this range (that is, under 5 ,%). At least one manufacturer provides a special kit for measurements from 10 to 100 ,% CO₂, but the normal 100-cc hand pump is not used. See Note 1.