1、 Overview:
　LTLUGB series intelligent typeVortex flowmeter is a new type of flowmeter developed based on the principle of liquid vibration, widely used in the measurement of fluids in industries such as petroleum, chemical, metallurgy, and papermaking. This flowmeter has no movable parts, strong reliability, high accuracy, and long service life. It can accurately measure the instantaneous flow rate and cumulative flow rate of liquids over a wide flow range. It is not affected by the temperature, pressure, viscosity, and composition of the medium, and is not blocked, stuck, easy to scale, resistant to high temperature and high pressure, safe and explosion-proof, suitable for harsh environments. Integrated display and remote transmission of flow scoring, and can output pulse signals or current signals to be networked with a microcomputer

2、 Main features:
1．Simple and sturdy structureNo movable parts, high reliability, very reliable for long-term operation.
2．Easy installation and convenient maintenance.
3. The detection sensor does not directly contact the measured medium,Stable performance and long lifespan.
4. The output is a pulse signal proportional to the flow rate, without zero drift,High precision.
5．Wide measurement rangeThe range ratio can reach 1:10.
6．Less pressure loss and lower operating costsMore energy-saving significance.
7. Within a certain Reynolds number range, the output signal frequency is not affected by the physical properties and composition changes of the fluid. The instrument coefficient is only related to the shape and size of the vortex generator, and there is no need to compensate when measuring the fluid volume flow rate. After replacing accessories, there is generally no need to recalibrate the instrument coefficient.
8．A wide range of applications，Steam (saturated steam), gases (air, oxygen, nitrogen, coal gas, natural gas, gas, hydrogen, liquefied petroleum gas, hydrogen peroxide, flue gas, methane, butane, chlorine gas, gas, biogas, carbon dioxide, nitrogen, acetylene, phosgene, oxygen, compressed air, argon, toluene, benzene, xylene, hydrogen sulfide, sulfur dioxide, ammonia), steam, liquids, and water, liquids (water, high-temperature water, oil, food liquids, chemical liquids, etc.), liquids, and gases can all be measured for flow rate.

3、 Working principle:
　 The vortex flow sensor measures flow based on the theories of Kaman and Strouhsl regarding the generation of vortices and the relationship between vortices and flow velocity. When the medium flows through a triangular cylinder at a certain speed, an alternating arrangement of vortex bands is generated behind both sides of the triangular cylinder, known as the "Karman vortex street" (see figure below).

Due to the alternating generation of vortices on both sides of the vortex generator, pressure pulsations are generated on both sides of the generator, resulting in alternating pressure on the detection body. The piezoelectric crystal element encapsulated in the probe generates an alternating charge signal with the same frequency as the vortex under the action of alternating stress. The amplifier amplifies, filters, shapes, and finally outputs a pulse signal (or converts it into a 4-20mA signal) with a frequency proportional to the medium flow rate, which is sent to the integrator for processing, display, and control.

Within a certain Reynolds number range (2 × 10)⁴～7×10⁶）The relationship between the release frequency f of the vortex, the fluid velocity V, and the width d of the upstream face of the vortex generator is expressed as f=St · v/d. In the equation, St is the Strouhal number, which is a dimensionless coefficient. As long as the frequency f is accurately measured, the fluid velocity v can be obtained, and the volumetric flow rate can be calculated from v.

Vortex flow sensor vortex occurrence display

Insert the vortex street measuring head into a specific position in the pipeline, measure the local flow rate at that location, and calculate the average flow velocity value inside the pipeline based on the velocity distribution relationship of the pipeline section. It consists of a converter, an insertion rod assembly, a ball valve (as required), an installation short tube (ф 100), a vortex street measuring head, etc.

Installation steps:
1. Cut a hole slightly smaller than ф 100 and remove burrs directly above the pipeline where the flowmeter needs to be installed (this requirement applies to horizontal pipelines);
2. Place the short pipe with a flange on top of the hole, keep it perpendicular to the pipeline, and weld it firmly;
3. Place the gasket, insert the flowmeter, and connect the flange. If there is a ball valve at this time, first place the ball valve on the short pipe and connect it, then open the ball valve and insert the flowmeter;
4. Ensure that there is a straight pipe section with a diameter greater than 15D in front of the flowmeter and 5D behind it (D is the inner diameter of the pipeline).

6、 Model selection
The selection of flow meters is a very important task in instrument applications. According to relevant departments, 2/3 of the failures of flow meters in practical applications are caused by incorrect selection and installation. Please pay special attention.