(주)모스텍유니버스

MVFM100 Series Intelligent Vortex Flow Meter is manufactured according to the principle of Karman vortex principle together with latest digital transmitter ( DSP technology ).

It is widely used to measure liquid , gas , steam flow in the closed pipe line because the original detection is sealed in the test body, no contact with the measured medium and there is no lining material and moving parting, it does not need on-site maintenance and it is very popular with the majority of users in the industries of oil, petrochemical, water/waste watertreatment, metallurgy pharmacy, thermoelectric etc for the process control and measurement management.

Put a drum vertically into a burette and let some fluid flow down along the drum, by two sides of which there formed, in rotation, regular vortexes, which is called the Karman Vortex Street.

An output frequency of the Karman Vortex Street is related to fluid velocity and drum diameter , which can be described by following formula.

As an output frequency of the Karman Vortex Street is direct proportional to a velocity v.

As an output frequency of the Karman Vortex Street is direct proportional to a velocity v. It may work out an instantaneous flow rate by using a tested output frequency of the Karman Street. The Strohar number is a key coefficient for vortex street flow meters.

Within the lineal section of the curve , where St 0.17, the output frequency is direct proportional to the flow velocity, so a velocity v is derivable by using a tested frequency f.

MVSF series vortex street flow transducers detect the output frequency by using piezoelectrical element inside the sensor ( probes ) to test the stress that is alternatively acted on the element by vortex.

f: Outout frequency of the Karman Street    St : Coefficient ( called as Strohar number ),    v = velocity    d: diameter of drum