... Thermal Mass Gas Flowmeter XWQ series thermal mass flow meter was designed and produced based on America tech and ... also pass country standard (JJG879-95). XWQ flow meter direct mass flow measurement without the need for pressure ... , steel, chemicals, petroleum, metallurgy, paper, food, urban drainage and other industries diameterD25mm300mmD40mm2000mmflow velocity0.160m/s,if flow velocity ...