... as volumetric measuring instrument featured with high accuracy, wide measuring range, small volume, light weight, easy installation and maintenance, reliable ... is widely used in the flow measurement of natural gas, coal gas, inert gas, and air etc. And it is the ideal ... 1.5%Explosion-proof grade: ExiallCT4Protection Level: IP65Flow range table of AJY series of Gas Roots Flow meter Roots flow meter for ...