Zero Air Plus 6.0 (99.9999%) (CO+CO2 0.1 ppm, H2O 0.5 ppm, THC 0.05ppm, NOx/SO2/NH3/H2S: Not Detectable) contains ultra-low levels of impurities making it an ideal zero gas for analytical instrumentation. It is also an ideal detector and/or purge gas for a range of detector types, analytical techniques and processes. The certified levels of impurities means that it supports legislative compliance, for example with Euro 6 regulations covering dilute exhaust gas analysis in the automotive industry. Supplied in a 50 litre steel cylinder at 200 bar.