What are the reasons for the inaccurate measurement of the steam vortex flowmeter?

What are the reasons for the inaccurate measurement of the steam vortex flowmeter:

1. Some problems in the selection of steam vortex flowmeters: some vortex flowmeters will choose larger specifications than usual due to changes in process conditions in the selection of caliber or design.The actual selection should be to choose the smallest caliber as possible, so that the measurement accuracy can be improved. For example, there are several equipment used in a vortex pipeline design, because the process equipment is sometimes not used.It is that the actual flow rate is reduced, and the original design selection diameter of the actual vortex flowmeter is too large, which relatively increases the lower limit of the flow rate that can be measured.The indication cannot be guaranteed when the flow rate of the process pipeline is small. The vortex flowmeter can be used when the flow rate is large. If it needs to be rebuilt, it will be a bit difficult. Flowmeter parameters are rearranged to improve the accuracy of indication.

2. The influence of steam vortex flowmeter measurement on temperature, its stable number is very obvious to the geometric size change of the measuring body, it is composed of two parts.One is caused by changes in the width of the vortex generating body; the other is caused by changes in the passage in the pipeline.If the vortex flowmeter wants to eliminate this effect, it usually corrects the K coefficient. At present, the vortex flowmeters of some manufacturers have implemented fixed temperature correction and real-time temperature correction in the software for the impression of temperature.

3. What is the reason for the adjustment direction of the steam vortex flowmeter parameters: it may be that the parameters are wrong, which will cause problems with the indication of the steam vortex flowmeter, and the wrong parameters will make the calculation of the full frequency of the secondary instrument wrong.The same full-scale frequency indicates long-term instability. In practice, the full-scale frequency of the vortex flowmeter is greater than the calculated full-scale frequency, which makes the indication fluctuate in a large range, and the value cannot be read.However, some data show that the inconsistency of the parameters will also affect the final determination of the parameters. Finally, the parameters are determined by recalibration and comparison with each other, which solves this problem.

4. The steam vortex flowmeter has three measurement types: basic type, differential pressure type and integrated temperature and pressure compensation type. The basic type measures the flow signal of a single working condition, the differential pressure compensation type directly measures mass flow, and the integrated temperature and pressure compensation type can Measure temperature, pressure, and flow signals, and output standard volume flow or mass flow after compensation.The product has two structural types, pipeline type and plug-in type, which can be displayed on site or transmitted over long distances. Each type has high temperature, high pressure, anti-corrosion, explosion-proof and other specifications, and there are integral and split structures to adapt to different measurements. media and installation environment.