Vortex flowmeter flange type intelligent meter head

Overview.

LUGB series vortex flow meter, is a velocity flow meter, mainly used for industrial pipeline fluid medium flow measurement, such as gas, liquid, steam and a variety of media measurement.

It is characterized by small pressure loss, a large range, high accuracy, in measuring the volume flow of working conditions almost independent of fluid density, pressure, temperature, viscosity and other parameters. No movable mechanical parts, so high reliability, low maintenance, instrument constants can be long-term stability. Among them, the insertion type vortex flowmeter, in the large pipeline welded base, and with the installation of ball valves, can be loaded and unloaded in a constant flow, so as to facilitate operation in dirty media and regular cleaning and maintenance.

The meter adopts piezoelectric stress sensor, can be used for a long time in the working temperature range of -20 ℃ to +300 ℃, widely used in petroleum, chemical, metallurgical, pharmaceutical, water treatment and other industries in the field of flow measurement and measurement and control work. The output of this instrument, with analog standard signal, also has a digital pulse signal output, easy to use with computers and other digital systems, is a more advanced, ideal flow meter.

◆Product implementation standard: JB/T9249-2015 (industry standard)

◆General flange standard: GB/T9119-2010 (national standard)

◆Type approval certificate: 2010F450-33 2006F414-33

Working principle.

When a columnar resistance body is inserted vertically in the fluid, vortices will be generated alternately on both sides of it, with the fluid moving in the downstream direction, called Carman vortex street, see the figure below. The resistance body that generates the vortex street is called the vortex generator. Experimentally, it is proved that the frequency of vortex is proportional to the flow velocity, which can be expressed by the following equation：

Experimentally proven: when the distance h between two columns of vortices and the distance L between two vortices in the same column meet the formula h/L = 0.281, the asymmetric vortex column can maintain a stable state. When the fluid Reynolds number Re in the range of 5000-150000, Sr is basically unchanged, so when the vortex generator column width d and Strohal number Sr for a fixed value of the vortex generator frequency transmission fluid is proportional to the average flow rate, that is, proportional to the flow Q and pressure, temperature, density and other parameters are not relevant.

When the vortex is generated on both sides of the column, the sensor is subject to the effect of alternating lift force perpendicular to the direction of flow induction signal, the frequency of change of the lift force is the vortex frequency, the sensor will send the signal to the converter to amplify and shape the pulse signal with the flow rate is linearly proportional to the direct output or will be converted into a 4 ~ 20mA standard signal output, the relationship between flow Q and frequency is as follows：

涡街流量计厂家所需的技术知识计量范畴从非常基本的阅读水平计,写出的转移率和总应用自动化系统的高质量的技术能力,使一个客户操作/控制系统从几乎任何位置(见探讨监管和数据收集,也称为SCADA)。选择一个充压管道系统的仪表专家宣称,超出75%的电磁流量计安装实行得不满意,和选择不当占90%客户与米有难题。选择一个计充压系统能够令人困惑,由于可用的不同类型和风格市场。计务必配对系统,水客户告知计代理商下列基本资料保证仪表配对系统。要不是,读值和记录不准确,错误将不会喜欢水权利人。知道的范畴流系统的运行。范畴的流率越低的泵的泵送率越强的系统所需的运算符。比如,一个系统可能必须泵至少20加仑每分钟为越小一点水达到120加仑每分钟的越大集合。低费率可能清除一些种类的米,由于低电磁流量计能够测量的范畴以外。