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Reasons for Decreased Measurement Accuracy of Liquid Turbine Flow Meters

by:Sincerity Group     2022-09-13
Abstract: The information on the reasons for the decline of the measurement accuracy of the liquid turbine flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. The liquid turbine flowmeter adopts a new and intelligent design, which can maintain high-precision measurement during use. In use, the performance of the turbine flowmeter is superior, the service life is very long, and it has a strong anti-interference ability. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details of the reasons for the decline of the measurement accuracy of liquid turbine flowmeters. The liquid turbine flowmeter adopts a new and intelligent design, which can maintain high-precision measurement during use. When in use, the turbine flowmeter has superior performance and long service life, and it has a strong anti-interference ability. When in use, the turbine flowmeter may encounter various electromagnetic interference. If the anti-interference of the flowmeter If the ability is not good enough, the measurement accuracy of the flowmeter may be affected when it is used. Since the turbine flowmeter is more sensitive to the conditions on site, the user should meet its ideal requirements under the condition of maximum satisfaction, so as to maintain the accuracy of the factory instrument and obtain ideal measurement data. When the temperature and pressure of the fluid medium are quite different from the reference conditions, the volume change of the sensor housing can be calculated according to the material and temperature and pressure of the sensor, and the meter reading can be corrected. When the viscosity of the fluid medium in the working state is quite different from the viscosity of the calibration fluid, it is necessary to correct the parameters of the viscosity correction curve provided in the installation and operating instructions. And the turbine flowmeter has certain requirements on the length of its upstream and downstream straight pipe sections in the measurement, which must be met according to the installation requirements, especially when the user requires high precision. The meter displays the volume flow under the working conditions of the medium. To know the standard volume flow or mass flow, density compensation is also required. The accuracy of the liquid turbine flowmeter is determined under reference conditions (or standard working conditions). For turbine flowmeters, the reference conditions generally include: environmental conditions (ambient temperature 15℃~35℃, relative humidity 45%) ~75%, atmospheric pressure 86kPa, ~108kPa, no electric field, magnetic field interference, no vibration); power source condition (220V±10% or 110V, 50HZ±1, or 24VDC); fluid conditions (when using fluid calibration, the calibration pipeline is an industrial round tube, single-phase Newtonian fluid, fully full tube, fully developed turbulent velocity axisymmetric distribution, no vortex, no disturbance, steady flow. The calibration fluid is usually water, oil, and air, which can be selected according to needs. There is a long enough straight pipe section upstream and downstream of the turbine flowmeter. The fluid temperature is generally room temperature, and the fluid pressure is generally below 0.25MPa). Obviously, the actual working conditions of the turbine flowmeter are usually different from the reference conditions, which will cause the accuracy of the turbine flowmeter to change. The accuracy of the liquid turbine flowmeter decreases during use, which may be due to the following reasons: 1. The fibrous or viscous impurities in the fluid are attached to the rotating part of the flowmeter, which increases the rotating resistance, resulting in a decrease in the indication value of the instrument and a negative appearance. Errors are detrimental to the fluid supplier. 2. Changes in fluid temperature and pressure may cause the liquid in the pipeline to escape the air contained in the pipeline, or because the pressure in the pipeline is lower than the saturated vapor pressure of the fluid, part of the liquid will become steam, or the negative pressure of the medium may cause the external air. The gas is sucked into the pipeline, and these gases flow with the liquid to be measured, causing the indication value of the instrument to increase, resulting in a positive error, which is unfavorable to the demand side of the fluid. 3. There are generally some impurities in the medium, which will cause wear and tear on the bearings and shafts, which will increase the gap between the two, the dynamic balance of the moving parts will be destroyed, the speed will drop, or the dirt will enter the gap, which will increase the movement resistance. , the speed drops. All of these reasons cause the display value of the instrument to decrease and negative errors to appear, which is unfavorable to the fluid supplier. 4. The harsh working environment will also have a great impact on the measurement results, such as electromagnetic field interference, dust, high temperature, vibration, humidity, etc., which may cause the malfunction or failure of the turbine flow sensor, and directly cause the indication error of the turbine flowmeter. , the error may be positive or negative, it may not be obvious, or it may fail completely. For the above phenomenon, when it is more serious, problems can be found from the comparison of the working status of the process, and it is easy to take corresponding measures. However, in the early stages of the problem, the problem cannot be detected without taking special measures. Automation instruments are located in what is known as“JAC Pearl”,“Little Jiangnan in northern Jiangsu”The famous water town on the shore of Gaoyou Lake--Jinhu Our company is a high-tech enterprise specializing in R&D, production and sales of industrial automation products, and provides technical services for industrial automation system integration. The company has always focused on high-tech R&D and production of advanced equipment It has become a mature R&D and manufacturing base for a full range of industrial automation instruments such as intelligent pressure detection, level detection, flow detection, display adjustment and control. Products are widely used in steel, non-ferrous metallurgy, petrochemical, electric power, urban central heating, water/sewage treatment, food processing, pharmaceutical and other fields. At present, the company has a number of professional production workshops and calibration and testing lines, more than 120 employees, technology and network throughout South China, East China, North China, Southwest China, Northwest provinces, annual sales of more than 200,000 sets of industrial automation instrument products. With excellent quality, advanced update, professional technology, perfect service to meet the highest needs of users. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Causes of Degraded Measurement Accuracy of Liquid Turbine Flow Meters'
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