NYLU-JB vortex flowmeter is researched and produced according to the principle of Karman vortex street. It is mainly used for flow measurement of industrial pipeline medium fluid, such as gas, liquid, steam and other media. It is characterized by small pressure loss, large measuring range, high accuracy, and almost no influence of fluid density, pressure, temperature, viscosity and other parameters when measuring volume flow under working conditions. There are no movable mechanical parts, so the reliability is high and the maintenance is small. The instrument parameters can be set for a long time. The vortex flowmeter adopts piezoelectric stress sensor with high reliability. It can work in the working temperature range of - 20 ℃~+250 ℃. It has analog quasi signal and digital pulse signal output. It is easy to use with computer and other digital systems. It is an advanced and ideal measuring instrument