Vortex flowmeter inaccurate

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What are the reasons for inaccurate measurement of vortex flowmeters?

The principle of inaccurate measurement of vortex street flowmeter may have the following factors

1. The selection of vortex street flowmeter is generally based on one diameter and one flow range. Therefore, when choosing a vortex street flowmeter, accurate and reliable parameters must be provided in order to select a suitable diameter vortex street flowmeter.

. If the diameter of the vortex street and the pipeline cannot match the stove god, it is recommended to use a variable diameter method to solve the problem.

2、 In the case of flow fluctuations, the flowmeter may experience large fluctuations during measurement. Firstly, when installing the vortex flowmeter, it is necessary to ensure that the installation method is correct in order to ensure the stability of flow measurement.

3、 The influence of accumulation on the upstream surface of the vortex generator in a vortex flowmeter. If there are viscous particles in the measured fluid, they may gradually accumulate on the upstream surface of the vortex generator, causing changes in its geometric shape and scale, and therefore the flow coefficient will also change accordingly. Therefore, attention should be paid to this in application.

2. Analysis of several causes of faults in vortex flowmeters

Common causes of faults in vortex flowmeters mainly include selection problems, parameter tuning errors, secondary instrument failures, connection problems, installation problems, line failures, environmental factors, and debugging problems. The specific analysis is as follows: Improper selection of caliber: Due to changes in process conditions (such as partial

equipment shutdown) after design selection, the actual flow rate is lower than the original design flow rate, resulting in inaccurate or no indication at small flow rates.

. For example, the pipeline originally designed for use by multiple devices had a reduced actual flow rate due to the discontinuation of some equipment, and the original selected diameter was too large, resulting in an increase in the lower limit of measurable flow rate. Accuracy cannot be guaranteed at low flow rates. Improvement measures: Combining parameter tuning to improve indication accuracy; If the process conditions change temporarily, the selection or measurement range can be optimized. Parameter tuning error full frequency calculation deviation: Parameter errors lead to errors in the full frequency calculation of secondary instruments, causing long-term inaccurate or large-scale fluctuations in indications. For example, when the actual full frequency is higher than the calculated value, the instrument indication fluctuates violently and cannot read steadily. Inconsistencies in data: Inconsistencies in multiple parameter data affect the final determination and require recalibration and mutual comparison to correct the parameters. Secondary instrument malfunction hardware damage: circuit board disconnection, range setting or K coefficient display bit damage, resulting in inability to determine range or K coefficient. Display abnormality: The fixing screw of the header coil is loose, causing the header to sink, and the friction between the pointer and the case increases, resulting in large rolling and leakage, and the movement is not flexible. Improvement measures: Repair the broken circuit board and replace damaged display bits; Tighten the

What are the reasons for inaccurate measurement of vortex flowmeters?

2. Analysis of several causes of faults in vortex flowmeters

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