The SY-LUGB vortex flowmeter is a new-generation smart flowmeter from HUALIU. Featuring a sound design and powerful functionality, its linearity-correction capability reaches an industry-leading level. It uses a fine, low-power full-dot-matrix LCD display that is clear and intuitive with simple operation, supports RS485 or HART communication, and offers a range of compensation algorithms that satisfy virtually all flow-compensation calculations. Instrument calibration is completed on the company's advanced sonic-nozzle flow calibration rig.

Its basic principle is the Karman vortex street, whereby the vortex-shedding frequency is proportional to the flow velocity. As the measured medium flows past the triangular bluff body inside the meter body, vortices are alternately shed on each side of the body to form a "vortex street". A piezoelectric element in the detection probe converts the pulsating pressure into a frequency signal, and each output pulse represents a defined volume of the measured fluid. The transmitter adopts an advanced circuit design with no zero drift, high accuracy and a wide measuring range; the typical turndown ratio is 8:1, up to a maximum of 40:1.

The vortex flowmeter is a velocity-type flow instrument widely used for the metering, measurement and control of liquids, steam and most gases.