Vortex flowmeter insertion type (with valve) 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, there are analog standard signal, but also 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 are generated alternately on both sides of it, moving in the downstream direction with the fluid, 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：

Experiment proves that 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 to 4 ~ 20mA standard signal output, the relationship between flow Q and frequency is as follows：

解决时，请拆装仪表，拆下形变的瓶塞，随后并对再次定型，并检查防腐型电磁流量计是否与导向杆同舟。假如它不是同舟的，则对它进行校准，随后安装转子，拿手促进转子，并感到转子左右无障碍。是的，此外，转子流量计务必竖直或水准安装，而且不能倾斜，不然很容易造成流量计卡死并给测量带来偏差。

涡街流量计供应商运用了低压、多脉冲时差原理，选用高精密和超稳定的双均衡信号差分发送、差分接收数据检测技术来测量顺水和倒流方向的声波传送时间，依据时差计算出流速。超声波流量计具备稳定性好、零点漂移小、测量精度高、量程比宽、抗干扰强等特性。

超声波流量计工作原理：当超音波束在液体中传播时，液体的流动将使传播时间产生细微转变，其传播时间的转变正比于液体的流速。