First of all, the vortex flowmeter is based on the principle of Karman vortex street. When the gas meets the triangular column of the vortex generating body, Karman vortices are generated. The vortex street piezoelectric ceramic probe records the frequency signal and the signal can be calculated after the signal plate processing. value. Vortex flowmeters can be used for water vapor measurements. The current application of many is the measurement of steam.
The advantage of vortex flowmeter measurement is its small pressure loss, easy installation and use, and accurate metering.
Vortex flowmeters used in vortex flowmeters to measure steam generally require temperature and pressure compensation because the temperature and pressure of the steam are constantly changing, and the steam density can only be calculated by measuring the exact temperature pressure. The calculated mass flow is accurate.
The temperature and pressure compensation is generally divided into one-piece compensation and split-body compensation. The advantage of one-piece compensation is that the installation is convenient and beautiful, but the accuracy is affected. Because the integrated temperature and pressure are not in direct contact with the medium. However, this deviation is also related to the product design and quality of each manufacturer. For example, the temperature sensor of Xudong Instrument Factory, a manufacturer of vortex street flowmeters, is installed at the bottom of the probe with practically no deviation, and the pressure deviation is also very small. Of course, the accuracy is more accurate than the integrated type vortex flowmeter. It is the temperature transmitter and pressure transmitter installed separately on the pipeline for measurement, such measurement results closer to the true value.
Imported vortex flowmeters such as E+H, Rosemont precision and stability can have general accuracy of 0.75% and 1.0%, such values ​​are only theoretical values, the actual accuracy is difficult to achieve, and the price is higher than the domestic several times. Domestic vortex flowmeters can also achieve such accuracy. Therefore, everyone should not blindly respect the choices, but must choose according to the site conditions and the accuracy and stability requirements.
The quality of domestic vortex flowmeters is of course uneven. There are several reasons for these problems. One is the linear cutting technology of vortex street probe machining. Whether the vortex flowmeter processed is smooth or not, and the flow of the probe is not good. What fluctuates and the flow rate measured by a probe with poor quality will fluctuate. Vortex flowmeter circuit board is also a good or bad factor, 8-bit microcontroller board does not have 16-bit circuit board strong anti-interference, using a 16-bit chip, anti-interference performance and stability can be better. No large fluctuations in flow rate due to small vibrations at the site.
Whether the vortex flowmeter is good or bad is the quality of the verification device. Some small workshops have almost no appraisal devices, so there is no precision at all. In addition, some companies are calibrated against the standard table, and often do not use real standard tables in order to save costs, so the accuracy is not high. The identification device of our Xudong Instrument Factory is calibrated against both the reference standard and the real-time calibration of sonic nozzles, so accuracy and stability are guaranteed.
Vortex flowmeter professional manufacturer Jiangsu Huawei Yuanhang Automation Instrument Co., Ltd.
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