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.