The vortex flow meter is a speed type flow instrument which has a wide range of uses. It is suitable for flow metering, measurement and control of liquids, steam and most gases.

The LUGB type vortex flowmeter is a new type of flowmeter introduced by our company, the design of which is reasonable and the function is powerful, it also has linear correction function, reaching the world advanced level. The flowmeter adopts a high-resolution low-power full dot-matrix LCD display, which is clear and intuitive and it’s easy to operate. RS485 or HART communication can meet various needs of users; 12 kinds of compensation algorithms can almost satisfy all flow compensation calculations. Correction curve relying on external data and calibration method based on standard signal lead the trend of instrument calibration.

The vortex flow sensor is composed of vortex generator, detection probe and corresponding signal amplification circuit.

When the fluid flows through the vortex generator, alternating two rows of vortices will be formed on both sides of the vortex generator. And this vortex is called the Karman vortex street. Based on the theory of Karman vortex street, Stroha proposed that the frequency of the Karman vortex street is proportional to the flow velocity of the fluid, and here is the relationship between frequency and velocity of flow: F=St * V/d

Where：F：Frequency of vortex（Hz）

V：Mean flow velocity on both sides of the vortex generator（m/s）

St： Strohal coefficient (which is constant over a range of Reynolds numbers)

d： Width of the the inflow surface of the vortex generator（m）

Remote transmission vortex flowmeter five type number detection method

1. Detection elements are set inside the vortex flowmeter to directly detect pressure pulsation.Vortex separation causes pressure pulsation on both sides of the generating body, which ACTS on the generating body in the form of lift.The frequency and amplitude of the pressure pulsation can be detected by a force sensitive detector installed in the generator.

2. A measuring hole and a pressure guide hole are set on the generating body to detect the pressure difference between the two sides of the body.The method of introducing the alternating differential pressure signal into the measuring hole with the pressure guide hole is helpful to improve the signal to noise ratio.

3. The method of detecting the alternating circulation around the vortex flowmeter.The alternating circulation caused by vortex separation can change the local velocity of flow around the body. It is an effective method to use the resistance change of thermistor or ultrasonic frequency measurement.

4. Detection of alternating differential pressure on the back of the body.On the back side of the generator, the signal of alternating differential pressure is selected to be strong and the signal of vortex street is measured by detecting elements such as thermally sensitive stress-strain ultrasonic which are installed at the measuring position with less noise.

5. The way to detect the vortex column in the wake of the vortex meter's oscillation.The detection element is installed downstream of the generator to detect the frequency of vortex in the oscillating wake, which is a widely used method.