Use Argon as carrier gas, GC2010D-II Vehicle-mounted Transformer Oil Dissolved Gas Analyzer (Similar Portable DGA) can analyze 11 fault gases. That is:

hydrogen(H2), oxygen(O2), nitrogen(N2), carbon monoxide(CO), carbon dioxide(CO2), methane(CH4), ethane(C2H6), ethylene(C2H4), acetylene(C2H2), cyclopropane(C3H6),Propane(C3H8).