Fluid: Gas (Natural Gas, LPG or Air) High Accuracy: 1.5% or 1.0% ... -proof ExdBT4Spectrum 2*,4*,6,10,15,25,40,50,80,100,150,200,250,300mmSpecification ModelVIVO3011-NVIVO3011-AVIVO3011-BVIVO3011-CVIVO3011-DDiameterDN25 ... Flow RangeExtended Flow RangeDN25 (1")2.5-25 m3/h4-40 m3/hDN40 (1.5")5-50 m3/h6-60 m3 ... /h80-1600 m3/h200-4000 m3/h DN 300 (12")200-4000 m3/h130-2500 m3/h Gas Turbine Flowmeter