Division 8.1.9 CO and CO2 measurements United Kingdom Original text. Later amendments are not shown. 8.1.9.1H2O interference verification for CO2 NDIR analyzers 8.1.9.2H2O and CO2 interference verification for CO NDIR analyzers ← Division 8.1.8.7.5 Division 8.1.9 Division 8.1.9.1 →