MakeUp Gas Generators (Membrane technology) - Zero Nitrogen & Air for GC carrier and flame gas applications Description Catalogue Ref.Drawing No. ZN, 400ml/min, <1ppm THC, >99%, 4.1-8.2 bar g (60-119 psi g) ZN, 400ml/min, <1ppm, THC, >99%. ZA 2.5L/min, <0.05ppm THC, 41-8.2bat g (60-119 psi g)