The reason why the steam vortex flowmeter is not accurate on the market at present

The reason why the steam vortex flowmeter is not accurate on the market at present

The Xiamen Jingchuan JCVF steam vortex flowmeter is a speed flowmeter made by the Kalman vortex street theory using the natural vibration principle of the fluid and using the piezoelectric crystal or differential capacitor as the detecting component.

The steam vortex flowmeter has three types of basic type, differential pressure type and temperature and pressure compensation integrated type. The basic type measures the flow signal of single working condition, the differential pressure compensation type directly measures the mass flow, and the temperature and pressure compensation integrated type can measure the temperature at the same time. , pressure, flow signal, after compensation, output standard volume flow or mass flow. The product has two types of structure: pipeline type and plug-in type. It can be displayed on site or remotely. Each type has high temperature, high pressure, anti-corrosion, explosion-proof specifications, and has integral and split structure to adapt to different measurements. Media and installation environment.

Some problems in the selection of steam vortex flowmeters: Some vortex flow sensors are designed for caliber or because of changes in process conditions, which will make them choose a larger specification than usual. The actual selection should be to choose the smallest possible diameter, so that the accuracy of the measurement can be improved. For example, there are several devices used in a vortex pipeline design, because some parts of the process are sometimes not used. It is caused by the actual use of the flow reduction, the actual design of the vortex flowmeter caused by the original design selection aperture is too large, which is relative to the increase of the measurable flow rate lower limit. The indication is not guaranteed when the process pipe has a small flow rate. The vortex flowmeter can be used when the flow rate is large. If it is to be rebuilt, the difficulty will be a bit large. The change of the process conditions is only temporary, and it can be combined with the vortex street. Flowmeter parameters are rearranged to improve the accuracy of the indication.

The effect of the steam vortex flowmeter on temperature is very obvious. The stability number is very obvious for the geometrical change of the measuring body. It consists of two parts. One is caused by a change in the width of the vortex generator; the other is caused by a change in the inside of the pipe. If the vortex flowmeter wants to eliminate this effect, it is generally to correct the K factor. At present, some manufacturers' vortex flowmeters have already made a fixed temperature correction and real-time temperature correction in the software.

What is the cause of the parameter adjustment direction of the steam vortex flowmeter: there may be a parameter error, which may cause a problem in the indication of the steam vortex flowmeter, and the parameter error may cause the secondary instrument full frequency calculation to be incorrect. The full-scale frequency phase is almost indicative of long-term instability. In practice, the vortex flowmeter full-scale frequency is greater than the calculated full-scale frequency so that a large range of fluctuations is indicated, and the value cannot be read. However, some data show that the parameter inconsistency will also affect the final determination of the parameters. After Zui, the parameters are determined by recalibrating and comparing with each other to solve the problem.

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