... charging protectionTechnical parametersSingle extent analyzerH20~100% (background is single gas or composite gas with steady thermal conductivity value, such as air, ... N2, O2,CO2, etc. )CO20~100% (background gas is single gas or composite gas with steady thermal conductivity value, such as air ... , N2, O2, H2, etc.)He70~100% (background gas is single gas, such as air, N2, O2, etc.)O295~100% ( ...