The Series AR710/720 Rack Mountable Isothermal Gas Chromatograph has a High Frequency Discharge Ionization Detector (HFADD) installed for the specific analysis of impurities in Argon. The analysis of H2, O2, N2, CH4, and CO with the option of adding CO2, are performed between the low ppb and 200 ppm range. Pre-tested analytical columns for analysis of impurities in argon are standard in the AR710/720.