Analyze the cause of measurement error caused by differential pressure flow meter in industrial production

Abstract: Analysis of the causes of measurement errors caused by differential pressure flowmeters in industrial production is provided by excellent flowmeter and flowmeter manufacturers. Orifice differential pressure flowmeter is an important means of energy management for industrial enterprises to measure flow. It has the characteristics of simple structure, convenient installation and low price. When the differential pressure flowmeter is actually applied in the field, its measurement error tends to increase, and sometimes it can be achieved. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the analysis of the reasons for the measurement errors caused by differential pressure flowmeters in industrial production. Orifice differential pressure flowmeter is an important means of energy management for industrial enterprises to measure flow. It has the characteristics of simple structure, convenient installation and low price. When the differential pressure flowmeter is actually applied in the field, its measurement error tends to increase, sometimes reaching 10%--20%, especially when the differential pressure flowmeter is used as the material (water, steam, water, steam, etc.) in the production process. It is particularly important to reduce measurement errors when conducting economic accounting and material balance in the measurement of gas and raw materials. However, it must be noted that not only a reasonable selection, accurate design calculation and manufacturing are required, but also attention must be paid to correct installation, maintenance and compliance with the conditions of use to ensure that the orifice flowmeter has sufficient actual measurement accuracy. Let’s analyze several reasons for the measurement error: 1. If the working state of the measured fluid changes, if the working state of the measured fluid (such as temperature, pressure) and the corresponding parameters such as fluid density, viscosity and pipe roughness are used in practical applications , which is inconsistent with the design. If the flow rate is still calculated according to the original instrument constant, there will be an error with the actual flow rate, which can be revised or redesigned according to the relevant calculation formula. 2. The installation of the orifice plate is incorrect. When a company just put into production and commissioning, the gas flow meter showed that the gas flow meter was too small. After inspection, the orifice plate was installed backwards, but in fact, the sharp side of the orifice plate should face the flow direction of the fluid as the inlet end, in the shape of a horn. One side of the mouth shape is the outlet end, pay attention to the direction. In addition, during installation, the center of the orifice opening and the center line of the pipeline are not concentric, which will also cause measurement errors. 3. The inlet edge of the orifice plate is worn out. Because the orifice plate has been used for a long time, especially when the measured medium is mixed with impurities such as solid particles, or is chemically corroded, the geometry and size of the orifice plate will change. The sharpness of the inlet edge of the plate is dulled by the impact or corrosion of the medium, so that the pressure difference ΔP generated when an equal amount of fluid passes through is reduced, resulting in a lower display value. In serious cases, the orifice plate needs to be replaced. 4. Scaling on the surface of the orifice plate and changes in the cross-sectional area of ​​the flow. During field use, the surface of the orifice plate may be covered with a layer of dirt, or due to the deposition of impurities at the front and rear corners of the orifice plate for a long time, or due to strong corrosion. The flow cross-sectional area of ​​the pipeline will be gradually changed, and the leakage and blockage of the pressure-inducing catheter will cause measurement errors. Because the gas used by our company is dirty (including tar), the pressure-taking ring chambers before and after the orifice plate are blocked, there is no pressure difference at the pressure-taking port, and the flow meter has no flow display. After dismantling, clean the two ring chambers and replace the pressure guiding pipe , the flow meter shows normal. 5. Improper zero-point drift and range setting of the transmitter will also cause measurement errors. Due to the long time, the zero-point of the transmitter will drift. If it is negatively drifted, the output current of the transmitter is less than the standard 4MA, and the flow rate is displayed on the low side. If the drift is positive, the output current of the transmitter is greater than the standard 4MA, and the flow rate is displayed on the high side. If the range setting is large, the flow rate will be displayed on the low side; if the range setting is small, the flow rate will be displayed on the high side. The flowmeter manufacturer insists“Technology, Innovation, Quality, Service”development policy, continue to uphold“Build an industrial aircraft carrier and contribute to the national economy”The purpose of the company is to actively participate in the market competition with high-quality products, preferential prices and excellent services, and sincerely cooperate with friends from all walks of life, new and old customers to create brilliance together. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Analysis of the Causes of Measurement Errors Caused by Differential Pressure Flow Meters in Industrial Production'

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