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Several problems needing attention in precise selection of vortex flowmeter

Yjlu series Vortex Flowmeter What should be paid attention to? Jiayi will make your choice today.

Firstly, the vortex flowmeter is based on the principle of Karman vortex street. When the gas meets the vortex generator triangular cylinder, it will produce Karman vortex, which will be recorded by the vortex piezoelectric ceramic probe and converted into frequency signal. The flow value can be calculated through the signal board processing. At present, the most widely used is the measurement of steam, of course, it can also be used to measure the flow of liquid. Its main advantages are small pressure loss, convenient installation and use, relatively accurate measurement.

Vortex flowmeter is used to measure steam. The vortex flowmeter usually needs temperature and pressure compensation, because the temperature and pressure of steam are changing at any time. Only by measuring the accurate temperature and pressure can the density value of steam be calculated, so the calculated mass flow rate can be accurate.

 Vortex Flowmeter

The main reasons for the uneven quality of domestic vortex flowmeter are as follows:

1. The quality of vortex flowmeter is affected by the quality of verification device. Some small workshops almost have no identification device, so the accuracy can not be said. In addition, some companies are compared to the standard table to calibrate, often in order to save costs and do not use the real standard table, so the accuracy is not high. Our company's appraisal device has both the calibration of standard table and the real flow calibration of sonic nozzle, so the accuracy and stability can be guaranteed.

2. The quality of the circuit board of vortex flowmeter is also a factor. The circuit board of 8-bit single-chip microcomputer is not as strong as 16 bit circuit board in anti-interference, and the 16 bit chip is used, so the anti-interference performance and stability performance are better. It will not produce large fluctuation of flow because of small vibration on site.

3. It is the wire cutting technology of machining vortex street probe. Whether the processed vortex flowmeter is flat or not, the flow rate of good probe has no fluctuation, and the flow measured by the probe with poor quality will fluctuate.

Temperature and pressure compensation is generally divided into integral compensation and split compensation. The advantages of integrated compensation are convenient and beautiful installation, but the accuracy has an impact. Because the temperature and pressure measured by the whole body are not in direct contact with the medium. But this deviation is also related to the product design and quality of various manufacturers, such as our company, our temperature sensor is installed at the bottom of the probe, which has almost no deviation from the actual situation, and the pressure deviation is also very small. Of course, the accuracy is more accurate than the one-piece vortex flowmeter. The temperature transmitter and pressure transmitter are separately installed on the pipeline for measurement, so the measurement results are closer to the real value.

Imported Vortex Flowmeter The accuracy and stability are generally 0.75% and 1.0%, which are only theoretical values, which are difficult to achieve in practice, and the price is several times higher than that in China. The domestic vortex flowmeter can also achieve this accuracy. Therefore, we should not blindly worship foreign countries, but choose according to the site conditions and accuracy and stability requirements.

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