Vortex flowmeter appears inaccurate reading causes and treatment methods Vortex flowmeter display inaccurate reasons mainly include selection, installation and parameter setting direction, etc. The specific solutions are as follows: Extended reading: Flowmeter Mingyu Automation
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1, the problem of selection:
Some vortex sensors in the caliber selection or after the design selection due to changes in process conditions, making a choice - a specification, the actual selection should be selected as small as possible to improve the measurement accuracy, for example, a vortex street Designed for use by several devices, due to the fact that part of the process equipment is not used sometimes, resulting in the current actual use of the flow is reduced, the actual use of the original design selection aperture is too large, equivalent to increase the measurable flow rate lower limit, the process pipeline small flow When the instructions are not guaranteed, they can also be used when the traffic is large, because it is sometimes too difficult to remodel. Changes in process conditions are only temporary. The re-tuning of the parameters can be combined to improve the indication accuracy.
2, the installation of the problem:
The length of the straight pipe section in front of the sensor is not enough, which affects the measurement accuracy. For example, the straight pipe section in front of the sensor is obviously insufficient. Because the FIC203 is not used for metering, it is only used for control. Therefore, the current accuracy can be equivalent to degraded use.
3, the reasons for the parameter setting direction:
Due to a wrong parameter, the instrument indicates an error. The parameter error makes the secondary instrument full-scale frequency calculation error, the full-scale frequency is similar to the indication is not allowed for a long time, the full-scale frequency of the actual full-scale calculation makes full-scale fluctuations indicating that can not be read, and the parameters on the data The inconsistency also affects the final determination of the parameters. Finally, the parameters are determined by recalibrating and comparing with each other, and this problem is solved.
4. Effect of turbulence generating body inflow surface accumulation of vortex street flowmeter If there are viscous particles in the measured fluid, it may gradually accumulate on the vortex generating body inflow surface, causing its geometric shape and size to change, and thus the flow rate. The coefficient also changes accordingly, so you should pay attention to cleanup during use.
5, the impact of temperature on the measurement of temperature changes on the measurement body geometry changes in the impact of two parts, one is caused by changes in the width of the vortex body; the other is caused by changes in the pipeline. Elimination of this effect is generally a correction of the K-factor. At present, some manufacturers' flowmeters have fixed temperature corrections and real-time temperature corrections in software.
6, vortex flowmeter piping and the flowmeter through the inconsistencies caused by the impact. 
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