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Vortex flowmeter inaccurate

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Is it not accurate to use a vortex flowmeter without temperature compensation?

The actual measurement of the vortex flowmeter is only the flow rate, which is converted into a flow rate expression after knowing the diameter of the pipeline, the temperature and pressure of the medium.. When the pipeline diameter, medium temperature, and medium pressure are consistent with the design, the expressed flow rate is in line with the accuracy of the flowmeter. But if the diameter of the pipeline, the temperature of the medium, and the pressure of the medium change, this conversion becomes inaccurate and needs to be corrected. The most ideal correction method is to directly measure the temperature and pressure of the medium simultaneously (without changing the diameter of the pipeline), and then convert them with the flow rate. So, whether the vortex flow meter without temperature compensation is accurate depends on whether the medium temperature and pressure under the process conditions can be stably maintained within a certain range consistent with the design. Generally speaking, adding temperature and pressure compensation can improve the measurement accuracy of vortex flowmeters, but in most cases, it is acceptable not to add it. It depends on specific needs.

2. Reasons for inaccurate vortex flowmeter

Hello, KNKE, a well-known American imported vortex flowmeter brand commonly used in the project, is pleased to answer your question.

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1、 Parameter issues: Due to errors in the flow meter parameters, the entire instrument indication is incorrect. Parameter errors can cause errors in the calculation of the secondary instruments full frequency. A small difference in full frequency can resul

Vortex flowmeter inaccurate
t in inaccurate readings for a long time. The actual full frequency is greater than the calculated full frequency, which can cause a wide range of fluctuations in the indication and make it impossible to read. And the inconsistency of parameters in its data also affected the final determination of parameters. Later, the parameters were determined by recalibration combined with mutual comparison, which solved this problem. 2. Selection issues for imported vortex flowmeters from the United States: Some vortex flowmeters may choose a larger diameter specification due to changes in process conditions during pipe diameter selection or design selection. In actual selection, the smallest possible pipe diameter should be chosen to improve measurement accuracy, such as providing several devices for use in a set of vortex pipelines. Due to the fact that some equipment in the process cannot be used at times, the actual flow rate currently in use has decreased. The actual use has resulted in the original design selecting a larger diameter, which is equivalent to providing a measurable lower limit for flow rate. When the process pipeline has a small flow rate, the indication cannot be guaranteed. When the flow rate is high, it can still be used. If it is renovated, it will be a bit difficult. The change in process conditions is only temporary, and as long as it is combined with parameter tuning, the accuracy of the indication can be improved. 3. Installation issues: The main issue is that the length of the straight pipe section in front of the sensor is not sufficient, which affects the measurement accuracy. For example, the straight pipe section in front of the sensor is obviously insufficient. Since FIC203 is not used for measureme

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