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进口涡街流量变送器-美国阿卡迪亚品牌

进口涡街流量变送器Usage characteristics

Vortex flow transmitter is mainly used for the flow side of industrial pipeline fluid medium, such as gas, liquid, steam and other media. It is characterized by small pressure loss, large measuring range and high accuracy. It is almost independent of fluid density, pressure, temperature, viscosity and other parameters when measuring volume flow under working conditions. There are no movable mechanical parts, so the reliability is high and the maintenance is small. The instrument constant can be stable for a long time. Plug in instrument is installed at the pipe inlet, and ball valve can be loaded and unloaded continuously. It is convenient for regular cleaning and maintenance when operating in dirty media. The instrument adopts piezoelectric stress sensor, which has high reliability and can work within the working temperature range of - 20 ℃ to+300 ℃. With analog standard signal and digital pulse signal output, it is easy to use with computer and other digital systems. It is an advanced and ideal flow instrument

进口涡街流量变送器working principle

When a columnar resistance body is vertically inserted into the fluid, vortices will be generated alternately on both sides of it, moving with the downstream direction of the fluid,

A vortex train is formed, called Karman vortex street, as shown in Figure 1. The drag body that generates the vortex street is called the vortex generator. Experiments show that the frequency of the vortex is proportional to the flow velocity,

进口涡街流量变送器It can be expressed as follows:

Experiments show that when the distance h between two rows of vortices and the distance L between two vortices in the same row meet the formula h/L=0.281, asymmetric vortices

The vortex train can keep stable. When Reynolds number Re of fluid is within the range of 5000-150000, Sr is basically unchanged, so when vortex occurs

When the cylinder width d and Strouhal number Sr are fixed values, the frequency f of the vortex generator is proportional to the average flow velocity of the fluid, that is, proportional to the flow Q and proportional to the

Pressure, temperature, density and other parameters are independent.

When the vortex is generated on both sides of the cylinder, the sensor receives the signal induced by the alternating lift perpendicular to the flow direction, and the change frequency of the lift is

Vortex frequency. The sensor sends the signal to the converter for amplification and shaping to obtain a pulse signal with a linear proportion to the flow rate, which is directly output or converted into

4~20mA standard signal output, the relationship between flow Q and frequency f is as follows:

Structure and size

This series of vortex street transmitters have three connection methods and overall dimensions

Flange clamping type

It is mainly used for full tube vortex street meter with a drift diameter of 15~100. See Figure 3 and Table 5 below

Flange connection type

It is mainly used for full tube vortex street meter with a drift diameter of 125~350. See Figure 3 and Table 5 below

Plug in

It is mainly used for large-diameter pipelines with a drift diameter of 200-2000. See Figure 4 on the right

(Ball valve is mainly used for continuous loading and unloading, which is convenient for regular operation in dirty medium

Cleaning and maintenance. Prepared by users as required)

（仅供参考）