Installation and Precautions of Precession Vortex Flow Meter

Abstract: The installation and precautions of the precession vortex flowmeter are provided by the excellent flowmeter and flowmeter manufacturers. In order to make the precession vortex flowmeter work in a normal state, the installation and user must understand the specific structure, characteristics and flow signal conversion of the installed instrument, understand the functions of each link in the signal transmission process, and install and use it according to the product manual. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the installation and precautions of the precession vortex flowmeter. In order to make the precession vortex flowmeter work in a normal state, the installation and user must understand the specific structure and characteristics of the installed meter and the conversion of flow signals, understand the functions of each link in the signal transmission process, and install and use according to the product manual. Generally speaking, the following points should be paid attention to in the installation and use of the precession vortex flowmeter. 1) Choose a reasonable installation site. The installation site should avoid strong power equipment, high frequency equipment, and strong power switch equipment; avoid the influence of high temperature heat sources and radiant heat sources; avoid the influence of high temperature and strong corrosive atmosphere; avoid strong vibration and facilitate installation, wiring and maintenance. Vibration due to excessively long pipes must be eliminated upstream and downstream of the sensor. 2) The instrument is generally required to be installed horizontally, and the flow direction of the fluid to be measured should be consistent with the arrow indicating the flow direction on the housing. Can also be installed vertically or inclined. When measuring liquids, make sure that the sensor is always completely filled with liquid. In order not to affect the normal transmission of fluid during maintenance, it is recommended to add a bypass in the installation section of the instrument. 3) The precession vortex flowmeter has lower requirements on the front and rear straight pipe sections. In principle, no straight pipe sections are allowed before and after the flowmeter. However, it is generally required to have a 3D length of straight pipe section in front of the meter, and a 1D length of straight pipe section behind the meter. Special cases require 5D and 3D lengths. When the bend radius of the single bend or double bend is greater than 1.8D, the straight pipe section before and after the flowmeter may not be required. 4) Pressure compensation can be used when measuring gas or steam. 5) When the measured fluid contains impurities, a filter or filter should be installed in front of the instrument, but the requirements for the straight pipe section in front of the instrument should still be guaranteed. 6} Sensor installation method when measuring a small amount of out-of-phase gas-liquid two-phase flow. When measuring liquid, there may be a small amount of gas phase in the pipeline, and its content does not exceed the specified gas-liquid two-phase fluid. In order to prevent gas from staying in the sensor, a gas separator must be installed. When measuring gas, when the pipeline is subjected to the condensed liquid that may be produced by the gas to be measured, and the unstable liquid phase that has not been removed in the gas, it is installed vertically in order to prevent the liquid from staying in the sensor. When measuring height and low temperature fluids, the sensor itself should have effective holding measures. 7) The volume flow of the measured gas measured by the instrument is the actual flow of the measured gas in the working state. If the actual flow is converted into the standard flow in the standard state, it can be calculated by the following formula. In the formula, 4?p is the volume flow in the standard state; 4 is the volume flow in the working state; ho is the measured volume in the standard state. The absolute pressure of the gas; To is the thermodynamic temperature of the measured gas in the standard state; H is the absolute pressure of the measured gas in the working state; T is the thermodynamic temperature of the measured gas in the working state; Z is the measured gas in the working state. compression factor. 8) When the pipeline is long and may vibrate, a fixed bracket should be installed upstream and downstream of the flowmeter to prevent the pipeline from vibrating. As a rule of thumb, flow measurements are susceptible to airflow pulsations and pressure changes. 9) The volume flow meter coefficient K vn and the mass flow meter coefficient K,o are calibrated and determined at normal temperature before leaving the factory. When the working state of the instrument is quite different from the calibration state of the laboratory, the instrument coefficients K, and K‘It should be corrected. The correction method of the meter coefficient is the same as that of the vortex flowmeter. Any type of measuring instrument has its particularity, and the intelligent precession vortex flowmeter is no exception. In order to make this kind of instrument better serve the flow measurement work, the practical experience from the production site shows that the following aspects should be paid enough attention to by the relevant management and use departments. ① Pay attention to instrument selection When the instrument type (for example, intelligent precession vortex flowmeter) has been selected, the selection of instrument specifications and its supporting components is crucial. In a word, you can use it well when you choose it. To this end, two basic principles should be grasped in the selection process; namely: one must ensure the accuracy of use, and the other must ensure production safety. To do this, it is necessary to implement three selection parameters, namely, the short-term and long-term large, small and commonly used instantaneous flow (mainly used to select the size and specifications of the instrument), the design pressure of the measured medium (mainly used for Nominal pressure rating of the selected instrument), working pressure (mainly used to select the pressure rating of the instrument pressure sensor). ② Carry out pre-use calibration On the one hand, considering that there are still some difficulties in the field verification of such instruments at present.

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