What matters need to be checked before using the smart vortex flow meter

Abstract: The information on what matters need to be checked before using the intelligent vortex flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. The working principle of the intelligent vortex flowmeter is to set a vortex generating body in the fluid, and regular vortices will be generated alternately on both sides of the generating body. Vortex Street will generate a certain amount. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the article details of what needs to be checked before using the smart vortex flowmeter. The working principle of the intelligent vortex flowmeter is to set a vortex generator in the fluid, and regular vortices will be generated alternately on both sides of the generator, and the vortex rows are arranged asymmetrically downstream of the vortex generator, which is called“Karman Vortex Street”, the vortex street will generate a certain frequency, through the formula f=St*v/(1-1.27d/D)*d, (St is the Strouhal number, which is a dimensionless number, and the vortex generator and Reynolds number related; v is the flow rate; d is the width of the face of the generating body; D is the nominal diameter) to get the flow rate. Intelligent vortex flowmeter is mainly used for flow measurement of medium fluid in industrial pipelines. Such as gas, liquid, vapor and other media. It is characterized by small pressure loss, large measuring range, high precision, and is almost not affected by parameters such as fluid density, pressure, temperature, viscosity, etc. when measuring the volume flow of the working condition. No moving mechanical parts, so high reliability and low maintenance. The parameters of the intelligent street flowmeter can be stable for a long time. The instrument adopts piezoelectric stress sensor, which has high reliability and can work in the working temperature range of -10℃～+300℃. There are analog standard signals and digital pulse signal outputs, which are easy to use with digital systems such as computers. It is a relatively advanced and ideal flowmeter. Generally speaking, the output signal (frequency) of the vortex flowmeter is not affected by changes in the physical properties and components of the fluid, which means that the meter coefficient is only related to the shape and size of the vortex generator and the Reynolds number. Its advantages are: simple and firm structure, easy installation and maintenance; suitable for various types of fluids, such as liquid, gas, steam and some mixed phases; high accuracy, generally up to±About 1%R; wide flow range, up to 10:1 or 20:1 or more; small head loss; no zero drift; relatively cheap price; disadvantages are: not suitable for low Reynolds number Re<20000 The use of high viscosity, low flow rate, and small diameter is limited; the requirements for the environment are high, and places with vibration should be avoided as much as possible, and a long straight pipe section is required on the upstream side; the instrument coefficient is low, and the larger the diameter, the lower. The signal resolution is reduced, so the aperture should not be too large, generally used in DN15~DN300mm. What precautions should be taken before the installation and use of the vortex flowmeter, this article will give you a brief introduction. 1. There is no signal output from the sensor. The online detection sensor has no signal output. Check the wiring of the probe and the wiring of the amplifier board, and no problems are found. There is no problem with the removal of the amplifier board for inspection. Still no signal after reinstalling. Tap the amplifying board and find that the signal is sometimes absent, so it is concluded that the components of the amplifying board are virtually connected, check the solder joints, re-solder, and then install and debug, and it is normal. In the process of inspection and debugging, it was found that the sensor was installed on the pipeline, and the display instrument was installed in the control room. The two were not only far apart, but also located in two places. When adjusting the sensor, the debugging situation could not be directly seen from the display instrument. 2. Sensitivity adjustment The intelligent street flowmeter has been adjusted and calibrated before leaving the factory, but because the calibration medium is different from the actual medium, the condition of the calibration medium is also different from the actual situation, or the technical parameters provided by the user are not very accurate, so the first installation must be make adjustments. 1. When there is no fluid flow in the pipeline, the display meter should have no signal. If there is a signal output, the sensitivity is too high, and the sensitivity potentiometer should be slightly adjusted counterclockwise to reduce the sensitivity. 2. When the medium passes through the pipeline and the signal is absent or unstable, you can lightly adjust the magnification potentiometer to increase or decrease it. 3. Selection of compensation device and installation of intelligent street flowmeter. Generally, the measurement should be accurate when the airflow is stable and the temperature and pressure change is not large. However, the actual use situation is often not an ideal state, so a compensation device is required. There are two types of compensation devices, namely pressure compensation and temperature compensation. 1. Pressure compensation. The pressure transmitter is more sensitive, but the price is high. It can be installed on the upstream or downstream of the sensor, and the installation distance is 1D ~ 2D. 2. Temperature compensation. Due to the thermocouple or thermal resistance used for temperature compensation, response time is required, but the price is low. When installing, it should be installed upstream of the sensor, and should be installed in a vertical or countercurrent position, with a distance of 3D to 4D. 4. Simple calibration Generally, the use of intelligent street flowmeter is continuous, and it cannot be dismantled and checked at will when there is a problem. Here is an online inspection method, which is suitable for non-riot-proof occasions. After the oscilloscope is calibrated, it is used for inspection. The oscilloscope wiring hook is connected to the signal line, and the ground is connected to the ground. After adjusting the oscilloscope, a uniform square wave pulse signal should appear. Generally, there are high and low level output regulations in the manufacturer's instruction manual, and the oscilloscope displays the square wave high and low level values ​​to check whether they are consistent with the specified values. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'What Matters Need to Check Before Using Smart Vortex Flow Meters'

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