Digital vortex flow sensor

Digital vortex flow sensor

Overview of Digital vortex flow sensor

The model of Digital vortex flow sensor, which is mainly used for the flow measurement of industrial pipeline medium fluid, such as gas, liquid, steam and other media. There are no movable mechanical parts, so it has high reliability and small maintenance. The instrument parameters can be stable for a long time. The Digital vortex flow sensor adopts piezoelectric stress sensor with high reliability and can work within the working temperature range of -20 ℃ ~ +250 ℃.
Digital vortex flow sensor is a new type of flowmeter with international advanced level, which is successfully developed based on Carmen vortex principle. Because it has the advantages that other flow meters cannot have at the same time, it has developed rapidly since the 1970s. According to relevant data, it has been widely used in various fields. It will play a leading role in the future flow instruments and is the most ideal substitute for orifice flowmeter.
Vortex flow sensor is suitable for measuring mass flow and volume flow of superheated steam, saturated steam, compressed air and general gas, water and liquid。

Product application of Digital vortex flow sensor
Digital vortex flow sensor is mainly used for flow measurement of medium fluid in industrial pipeline, such as gas, liquid, steam and other media. The Digital vortex flow sensor is characterized by small pressure loss, large measuring range and high precision. It is almost not affected by fluid density, pressure, temperature, viscosity and other parameters when measuring the volumetric flow under working conditions. There are no movable mechanical parts, so the Digital vortex flow sensor has high reliability and small maintenance. The instrument parameters can be stable for a long time. The Digital vortex flow sensor adopts piezoelectric stress sensor with high reliability and can work within the working temperature range of -20 ℃ ~ +450 ℃. It has analog standard signal and digital pulse signal output. It is easy to be used with digital systems such as computers. It is an advanced and ideal flow instrument.

Product principle of Digital vortex flow sensor
If a triangular column vortex generator is set in the fluid, regular vortices are alternately generated from both sides of the vortex generator. This kind of vortex is called Carmen vortex street vortex. As shown in the right figure, the vortices are arranged asymmetrically at the downstream of the vortex generator. Assuming that the vortex frequency is f, the average velocity of the measured medium is, the width of the upstream surface of the vortex generator is D, and the diameter of the table body is D, the following relationship can be obtained

Working principle diagram of Intelligent Vortex Flowmeter
F=sru1/d=sru/md (1)
Where U1 -- average velocity on both sides of vortex generator, M / S;
SR -- Strouhal number;
M -- ratio of bow area on both sides of vortex generator to cross-sectional area of pipeline
The volume flow in the pipe QV is
Qv= π d2u/4= π d2mdf/4sr (2)
K=f/qv=[π d2md/4sr]-1 (3)

Parameter description of Digital vortex flow sensor
Digital vortex flow sensor can accurately measure the flow of gas, liquid and steam in a wide flow range without being affected by the physical properties of the fluid.
It is not affected by temperature and pressure, and is not easy to block, jam or scale. It is resistant to high temperature and high pressure,
Safe explosion-proof, suitable for harsh environment
No movable parts, no holes and gaps design, no wear, dirt resistance, no mechanical maintenance, long service life
The on-site display flowmeter with micro power consumption high-tech and battery power supply can run continuously for more than two years;
Integrated design of temperature and pressure compensation;
Current output is electrically isolated, with good common mode interference suppression capability;
This flow value and cumulative flow value are displayed at the same time without switching in turn.
Anti vibration probe is adopted to effectively eliminate the influence of external vibration.
The circuit adopts surface mount technology, with compact structure and high reliability.
The split signal converter is adopted, and the maximum cable length is 10m.
Range ratio up to 20:1

Main tech data of Digital vortex flow sensor
The overall structure design of the instrument is reasonable, the dynamic measurement range is wide, and the pressure loss is small
The body is made of stainless steel, which is suitable for the measurement of corrosive media;
Field LCD display, pulse, 4 ~ 20mA output or 485 communication, which can be connected with industrial automation system;
◆ measuring medium: gas, liquid and vapor
◆ connection mode: flange snap on, flange and plug-in
◆ diameter specification: flange clamping type; diameter selection: 25,32,50,80100
Outline dimension drawing of clamped low temperature and high temperature vortex flowmeter sensor
Outline dimension drawing of clamped low temperature and high temperature vortex flowmeter sensor
◆ the diameter of flange connection type is 100150200 ◆ flow measurement range normal measurement flow velocity range Reynolds number 1.5 × 104~4 × 106; Gas 5 ~ 50m/s; Liquid 0.5 ~ 7m/s
See Table 2 for the measurement range of liquid and gas flow in normal measurement flow range; See Table 3 for steam flow range
◆ measurement accuracy: level 1.0, level 1.5, level 2.5
◆ measured medium temperature: normal temperature – 25 ℃ ~ 100 ℃
◆ high temperature – 25 ℃ ~ 150 ℃ - 25 ℃ ~ 250 ℃
◆ output signal pulse voltage output signal high level 8 ~ 10V low level 0.7 ~ 1.3V
◆ the pulse duty cycle is about 50%, and the transmission distance is 100m
◆ pulse current remote transmission signal: 4 ~ 20 mA, transmission distance: 1000M
◆ ambient temperature of instrument: -25 ℃ ~ +55 ℃ humidity: 5 ~ 90% Rh50 ℃
◆ material: stainless steel, aluminum alloy
◆ power supply DC24V or lithium battery 3.6V
◆ explosion proof grade: intrinsically safe iaiibt3-t6
Protection grade IP65