The vortex type flow meter produces a velocity flow meter based on the Karman vortex principle for the measurement and metering of conventional gases, vapours and liquids. The vortex flow meter has high precision and a wide range ratio. It has no moving parts in use, which can improve mechanical stability and reduce maintenance. The vortex flow meter is almost unaffected by the temperature, pressure and composition of the medium when measuring the working volume, so it is convenient for the calibration production of the instrument. Therefore, the vortex meter is widely used in production and life.