Vortex flow meter is one kind of velocity type flow meter, it’s based on Karman vortex theory and adopts piezoelectric crystal to detect the burble frequency of the fluid caused by flowing through the triangular prism in the pipeline and then measure the flow of fluid. It is widely used in petrol, chemical industry, light industry and power heat supply and so on.
WORKING PRINCIPLE
When the fluid in the pipeline passes the burble generator(triangular prism),burble will generate due to the acceleration of partial flow rate. The burble will arise alternatively in two burble lines, which is called Karman vortex.
The releasing frequency of Karman vortex depends on the size of triangle prim and flow rate of fluid, while independent of the medium feature parameter, such as the temperature, pressure, it can be indicated by the following formulas:
F=sR*v (1-1.27*d/D) Q=3600*F/K M=Q*P
â–ª F …. The releasing frequency of Karman vortex (Hz)
â–ª Sr …. Strouhal number (unit: dimensionless)
â–ª V ….. Medium flow rate (m/s)
â–ª d ….. The width of triangle prim
â–ª D ….. Vortex meter inner diameter (m)
â–ª Q …… Instantaneous volume flow rate (m3/h)
â–ª K …… Vortex meter coefficient (unit pulse number/m3)
â–ª M ….. Instantaneous quality flow rate (kg/h)
â–ª P …………. Fluid density (kg/m3)
BENEFITS
♦ Integrated pressure and temperature compensation.
♦ 4-20mA, pulse with HART; Optional pulse with RS485
♦ Wide temperature range up to highest temperature 350℃
♦ Adopt Japan OVAL technology and design
♦ Embedded sensor, 4 piezo-electric crystal encapsulated inside the sensor.
♦ No moving parts, no abrasion, non-wearing parts inside, fully welded SS304 body (Optional SS316)
