Overview

　　The LUGB series vortex flowmeter is a flow measurement instrument that uses a piezoelectric crystal as the sensing element and outputs a standard signal proportional to the flow rate. This instrument can be directly connected to instrumentation devices or used in conjunction with computers and distributed control systems to measure flow parameters of various media. Based on the detection principle of fluid-induced vortices, the piezoelectric crystal used to detect these vortices does not come into contact with the medium itself. As a result, this instrument features a simple structure, excellent versatility, and high stability.

　　The LUGB series vortex flowmeters can be used for flow measurement and metering of various gases, liquids, and steam. The LUGB series vortex flowmeters can be used in conjunction with the intelligent totalizers manufactured by our company, as well as with smart instruments produced by other instrument manufacturers, making them highly versatile.

Working principle

　　The fundamental principle of the vortex flowmeter is the Karman vortex street principle, which states that “the frequency of vortex shedding is directly proportional to the flow velocity.” The diameter of the flowmeter’s flow passage body is essentially the same as the instrument’s nominal bore size. As shown in Figure 1, a roughly isosceles triangular cylinder is inserted into the flow passage body. The axis of the cylinder is perpendicular to the direction of flow of the medium being measured, and its base faces the fluid.

In the formula:

f: Frequency (Hz) of vortex shedding from the side of a cylindrical body;

V— Lateral flow velocity in the column (m/s); d— Width of the column’s upstream face (m); Sr— Strouhal number.

It is a constant that depends on the cross-sectional shape of the cylinder and is essentially independent of the fluid properties and flow velocity.

Product Features and Applications

　　1. The sensor measurement probe is encapsulated using a special process, with a standard temperature resistance of 250℃ and a high-temperature version capable of withstanding up to 350℃.

　　2. The sensing element is encapsulated within the probe body, and the sensing component does not come into contact with the measured medium, ensuring a long service life.

　　3. The sensor features a compensation design to enhance the instrument’s seismic resistance.

　　4. Simple structure with no moving parts, offering high durability;

　　5. Within the specified Reynolds number range, the measurement is unaffected by the medium’s temperature, pressure, or viscosity.

　　6. The flowmeter can be used in explosion-proof environments and offers excellent safety.

　　7. Wide measurement range, up to 10:1;

　　8. Highly versatile, capable of measuring both dirty gases and liquids;

　　9. This instrument can be widely used for measuring the flow rates of various media—including water supply and drainage in large, medium, and small pipelines, industrial circulation systems, wastewater treatment, oils, chemical reagents, compressed air, saturated and superheated steam, natural gas, and other substances.

Technical Parameters

Selection

Example: To measure steam using a flange-mounted, explosion-proof vortex flowmeter with a pipe diameter of DN50, where the flow rate needs to be displayed on-site and a current signal transmitted remotely, the product model should be: LUGB-2305CE.

Applicable flow range for general liquids and gases

Factory display

Honor Show

Exhibition style