What are the reasons for vortex flowmeter inaccuracy?

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Vortex flowmeters are mostly used for the measurement of steam, gas, liquid and other related media. During use, it is inevitable to encounter the problem of inaccurate measurement of the vortex flowmeter. So what are the reasons for inaccurate measurement of vortex flowmeters? Today, the editor will take you through~

1. The vortex generator is affected by impurities

If there are sticky particles in the measured medium, they may gradually accumulate over time. On the upstream surface of the vortex generator, its geometric shape and size are changed, which in turn causes changes in the flow coefficient. Therefore, the vortex flowmeter can be removed regularly for cleaning and removal of particles and impurities in the pipeline.

2. Effect of ambient temperature

Since the vortex flowmeter is used in a environment with high temperature and humidity, it will affect or even damage the electronic components of the flow sensor. Therefore, steam pipes should be insulated and the environment should be moisture-proof.

3. The impact of inconsistent calibers

Vortex flowmeters should choose the appropriate caliber according to actual working conditions to improve the accuracy of measurement. Improper selection may cause the user's actual gas consumption to exceed the measurement range of the vortex flowmeter, resulting in inaccurate measurement or even damage to the vortex generator. When selecting a model, a vortex flowmeter of appropriate caliber should be selected according to the user's gas consumption. The measurement range of the vortex flowmeter should be able to completely cover the user's usage range. In particular, some users' gas consumption increases as the production scale increases. Enlarging. When it reaches a certain scale, it is necessary to replace the large-diameter vortex flowmeter in time.

4. Installation impact

Many users are limited by site conditions, and the installation of vortex flowmeters does not meet the requirements. For example, the straight pipe sections before and after the flowmeter are not enough, and the concentricity of the flowmeter installation is poor. , poor welding of pipes and flanges, etc. During installation, the straight pipe sections before and after the flowmeter must meet the requirements of the first 20D and the last 5D, so that the fluid at the flowmeter is in a fully developed state; the concentricity must be strictly ensured when the flowmeter is installed, and special tools can be used to ensure concentricity when necessary; pipelines The welding point with the flange should be smooth and without burrs.

5. Problem of external signal interference

Pipe vibration produces interference signals: external shock absorption measures can be adopted, such as brackets to fix the pipe, rubber cushions, changing pipes, etc. Some brands of vortex flowmeters can also eliminate shock by adjusting the flowmeter parameters.

External electromagnetic interference signals: Certain measures should be taken to weaken the electromagnetic interference or strengthen the shielding of the signal lines to ensure that the flow meter is well grounded during use and away from high-frequency interference sources, such as battery chargers, transformers, Welding machine, etc.

6. Parameter setting issues

Steam flow measurement has pressure and temperature compensation functions. In addition to the vortex flowmeter, the measurement system also has temperature transmitters and pressure transmitters. and flow totalizer. Sometimes the installation and parameter settings of these supporting equipment are incorrect, which will also produce large measurement errors.

The above are common reasons for inaccurate measurement of vortex flowmeters. For more questions about vortex flowmeter selection, installation, after-sales and other issues, please feel free to contact Supmea Measurement and Control.~