Points for attention in the application of vortex flowmeter

Abstract: The application of vortex flowmeter meter should pay attention to the information provided by the excellent flowmeter and flowmeter manufacturers. Vortex flowmeters are suitable for a wide range of fluids, but are not suitable for measuring low Reynolds number (ReD2104) fluids. When the Reynolds number is low, the Strouhal number changes with the Reynolds number, the linearity of the instrument becomes poor, and the fluid viscosity is high, which significantly affects or even hinders the generation of vortices. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the application of vortex flowmeters. Vortex flowmeters are suitable for a wide range of fluids, but are not suitable for measuring low Reynolds number (ReD2104) fluids. When the Reynolds number is low, the Strouhal number changes with the Reynolds number, the linearity of the instrument becomes poor, and the fluid viscosity is high, which significantly affects or even hinders the generation of vortices. The erosion of the vortex generator by the fluid containing solid particles will produce noise and wear on the vortex generator. If the short fibers contained in the ultrasonic flowmeter are wound on the vortex generator, the meter coefficient will be changed. The application of vortex flowmeter in miscible fluid is as follows: ① It can be used for gas-liquid two-phase flow with dispersed and uniform micro-bubbles, but the volume gas content should be less than 7%~10%. 2%, the meter factor should be corrected. ② It can be used for gas-solid, liquid-solid two-phase flow with dispersed and uniform solid particles and the content is not more than 2%. ③ It can be used for two-component flow of insoluble liquid (such as oil and water), etc. Pulsating and swirling flow will have a serious impact on the vortex flowmeter. If the pulsation frequency is consistent with the vortex frequency, the electromagnetic flowmeter may cause resonance, destroy the normal operation and equipment, and cause the vortex signal to be generated.”Lock (1ock-in)”phenomenon, when the signal is fixed at a certain frequency.”locking”It is related to the pulsation amplitude, the shape of the vortex generator and the blockage ratio. The accuracy of the vortex flowmeter is roughly ±(0.5%~2%) R for liquids, and ±(1%~2%) R for gases, and the repeatability is generally 0.2%~0.5%. If the vortex street is 1, it means pulse signal output, if the bus temperature transmitter is 3, it means with 485 communication, if it is 4, it means battery powered, without temperature and pressure compensation, if it is 5, it means temperature and pressure compensation is integrated, With 4-20MA current output, if it is 6, it means that the temperature and pressure compensation is integrated, and the battery is powered. When choosing a vortex flowmeter as a measurement, we must carefully select the model and pay attention to the details in the selection. Only when the model is selected can the measurement accuracy of the flowmeter be guaranteed. Points to note for vortex flowmeters 1. Reasonable Select the installation site and environment. Avoid strong power equipment, high frequency equipment, strong power switch equipment; avoid the influence of high temperature heat sources and radiation sources, avoid strong vibration places and strong corrosive environments, etc., and consider the convenience of installation and maintenance. 2. There must be enough upstream and downstream. straight pipe section. If there are two 90s in the same plane upstream of the sensor mounting point. Elbow, then: upstream straight pipe section≥25D, downstream straight pipe section≥5D. If there are two 90s on different planes upstream of the sensor mounting point. Elbow, then: upstream straight pipe section≥40D, downstream straight pipe section≥5D. The regulating valve should be installed beyond 5D downstream of the sensor. If it must be installed upstream of the sensor, the upstream straight pipe section of the sensor should not be less than 50D, and the downstream should not be less than 5D. 3. The piping upstream and downstream of the installation point should be concentric with the sensor, and the coaxial deviation should not be less than 0.5DN. 4. Vibration reduction measures shall be taken for the pipeline. Try to avoid installing the sensor on the pipeline with strong vibration, especially the lateral vibration. If the installation is unavoidable, vibration reduction measures must be taken, and pipe fastening devices and anti-vibration pads should be installed at the upstream and downstream 2D ​​of the sensor. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Key points for attention in the application of vortex flowmeter'

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