Vortex flowmeter flange type meter head no display

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：

（1）确保待测管道中涡街流量计规格液体满管并且没有气泡（安装自动放气阀）；

（2）确保准确测量服务器和超声波测距优良接地装置；

（3）超声波流量计的工作上开关电源无须与变频和髙压机械设备合用一个开关电源，尽量采用可调电源工作上；

（4）超声波测距电源线无须与推动力电缆线并行，应与蒸汽流量计屏蔽双绞线并行或单独走线并套金属波纹管给予维护屏蔽；

（5）将超声波流量计服务器避免影响自然环境；电磁流量计选型是选用技术研发的一种全智能、可靠性高的流量计,不但适合于一般的过程检验,还适用于煤浆、纸桨及糊状液态的测量，广泛应用于石油、化工、钢材、食品、电力、造纸、水利给排水、水政水源等领域。电磁流量计在充压管道系统里的七点挑选指南：挑选一个表必须1流的技术评估充压系统和全面的功能和点评营运商的要求。