Vortex flowmeter insertion type (without 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：

涡街流量计批发具备构造简易，直观，压力损失小，维护便捷的特性。下面给您介绍金属管转子流量计的故障处理，希望对您有所协助！金属管转子流量计故障处理：转子流量计指针颤动：

（1）指针颤动轻度：一般是由中等起伏造成的。能通过提升减振来克服。

（2）指针中等颤动：一般是由物质的流动情况造成的。针对气体，一般是因为物质的工作压力不稳定造成的。压力平稳或流量平稳设备适合于克服或提升转子流量计的气体减振。

（3）严重的指针颤动：关键是由于中等脉冲，不稳定的气压，或因为客户给出的气体运行状态的压力，温度和流量与转子流量计的具体情况不匹配。较大的差别会造成智能电磁流量计超量程。