How to solve the inaccurate flow of vortex flowmeter

The vortex flowmeter fluctuates greatly and is inaccurate. Please ask the instrument engineer to calibrate it, but it fails. If it is broken, it will be dealt with after the shutdown. The vortex flowmeter is the most worrying about the normal maintenance of the instrument. It cannot be repaired. You say the meter It's not broken, the craftsmanship is not accurate, you say it's broken, it's really not broken. The craftsman said that you don’t know anything, and you can’t justify it. This kind of watch really can’t be repaired. Steam with water will cause inaccuracy; small amount of medium will cause inaccuracy; on-site interference will cause inaccuracy; deviation from calculated pressure and temperature will cause inaccuracy; it will also cause inaccuracy if it is insane. If you ignore it, it will be fine after a while, but if you are busy with maintenance every day, it will become more and more inaccurate. The reasons for the inaccurate readings of the vortex flowmeter and the solutions to the inaccurate display mainly include three aspects: model selection, installation and parameter setting direction. The specific solutions are as follows: 1. Problems in model selection: Some vortex sensors In the selection of the caliber or after the selection of the design, due to the change of the process conditions, the selection is larger - a specification. The actual selection should choose the smallest caliber as possible to improve the measurement accuracy. For example, a vortex street pipeline is designed for several Due to the fact that part of the process equipment is not used sometimes, the current actual flow rate is reduced, and the actual use causes the original design selection diameter to be too large, which is equivalent to increasing the lower limit of the measurable flow rate, and the indication cannot be guaranteed when the flow rate of the process pipeline is small. , It can also be used when the flow rate is large, because sometimes it is too difficult to remodel, and the change of process conditions is only temporary. Can be combined with parameter recalibration to improve indication accuracy. 2. Problems in installation: The main reason is that the straight pipe section in front of the sensor is not long enough, which affects the measurement accuracy. For example, the straight pipe section in front of the sensor is obviously insufficient. Since it is not used for measurement, it is only used for control, so the current accuracy can be used, which is equivalent to downgraded use. . 3. Reasons for parameter setting direction: The instrument indication is wrong due to wrong parameters. Parameter errors make the calculation of the full-scale frequency of the secondary instrument wrong, the full-scale frequency is almost the same, making the indication inaccurate for a long time, the actual full-scale frequency is greater than the calculated full-scale frequency, which makes the indication fluctuate in a large range and cannot be read, while the parameters on the data The inconsistency also affected the final determination of the parameters, and finally the parameters were determined by recalibration combined with mutual comparison, and this problem was solved. 4. The effect of accumulation on the upstream surface of the vortex generating body of the vortex flowmeter. If there are viscous particles in the measured fluid, they may gradually accumulate on the upstream surface of the vortex generating body, changing its geometric shape and size. The coefficient also changes accordingly, so pay attention to cleaning during use. 5. The influence of temperature on the measurement The influence of temperature change on the change of the geometric size of the measuring body consists of two parts, one is caused by the change of the width of the vortex generating body; the other is caused by the change of the internal diameter of the pipeline. To eliminate this effect is generally to modify the K coefficient. At present, the vortex flowmeters of some manufacturers have fixed temperature correction and real-time temperature correction in the software for the influence of temperature.

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