What are the effects of the eccentricity of the electromagnetic flow meter and the interface shoulder on the performance?

Abstract: What are the effects of the nozzle eccentricity and the interface shoulder of the electromagnetic flow meter on the performance? The information is provided to you by the excellent manufacturers of flowmeters and flowmeters. The electromagnetic flowmeter is less affected by the flow velocity distribution profile of the upstream flow, so the requirements for devices such as the length of the front straight pipe are relatively low. This is because in the early stage of the development of electromagnetic flowmeters in the 1950s and 1960s, the measuring tube length of the smaller-caliber flow sensor was longer, and it was self-sufficient. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the influences of the eccentricity of the electromagnetic flowmeter and the interface shoulder on the performance? Article details. The electromagnetic flowmeter is less affected by the flow velocity distribution profile of the upstream flow, so the requirements for devices such as the length of the front straight pipe are relatively low. This is because in the early stage of the development of electromagnetic flowmeters in the 1950s and 1960s, the smaller diameter flow sensor has a longer measuring tube, which has already played a role in adjusting the distortion movement state to be fully spread, so the straight pipe section is not placed in advance in the early stage. The length of the request, and the early appearance accuracy is low, the basic error is generally±(1.5~2.5)%Fs (full scale value), even if there is active distortion, it is only a fraction of the fundamental error, and the doubt is not obvious. With the development of electromagnetic sewage flowmeters, the caliber has grown from small to medium to more than 1m. Domestic production has reached 3m. With the design and optimization of flow sensors, it is becoming lighter and smaller. The length between the electromagnetic flow sensor and the connecting surface of the pipeline is only 1.25-2.5 times of the diameter (D), the accuracy is generally improved, and the fundamental error is±0.5%R (measured value), so we feel the need to set the length of the front straight pipe regularly. The World Standardization Organization published IS09104 'Measurement of liquid flow in closed pipelines in 1991'—The rules in the 'Functional Appraisal Method of Liquid Electromagnetic Flowmeter': The inner diameter of the flowmeter pipe should not be smaller than the inner diameter of the flow sensor, and should not be greater than 3% of the inner diameter of the sensor; the device should be installed after the sensor electrode shaft base is at least 10D away from any upstream disturbance and downstream In the straight pipe section before the disturbance 5D, each surface manufacturer is also generally distanced from the upstream disturbance part when using the device.≥5D's request. In recent years, the use of the standard meter method to calibrate the flow rate is more popular, and many water flow calibration devices use a high-precision electromagnetic flowmeter as a standard meter. The requirements for electromagnetic flowmeter devices used as standard meters are more severe, and they cannot be treated according to the requirements of ordinary electromagnetic flowmeter devices. Some instrument manufacturers attach a straight pipe to the front and rear of the 0.3-level accuracy surface and even the regular flow sensor, and then calibrate them together. If they are disassembled and reassembled, they must be recalibrated. For example, the test object is an electromagnetic sewage flowmeter with a diameter of 50mm. There are three groups of pipes connected to the inlet. The inner diameters are 50mm, 55mm and 45mm, and the inlet shoulder formed by 55mm and 45mm has exceeded the rules of ISO9104. Less than 10% of the inner diameter of the flow sensor. The flow sensor measuring pipe is connected to the connecting receiving channel, and its base line and the pipeline base line are concentric, straight and horizontal, respectively, and the eccentricity is 3mm (6% of the inner diameter of the surface). The electromagnetic flowmeter is modified by lengthening the measuring tube on the stereotyped surface, and two 30mm horizontal and vertical directions are opened at both ends of the measuring tube.×3mm viewing window to measure velocity distribution with a laser Doppler velocimeter. The rubber fabric of the measuring tube has an arc transition with a radius of 7.5mm. To sum up (1) the effect of eccentricity on the flow measurement value. The eccentricity of the receiving level destroys the upper and lower symmetry of the flow velocity distribution in the measurement tube to the electrode base line. If some of the imports are concealed, some of the flow rates in the lower half will be relatively slow, and some in the upper half will be relatively fast. If it is straight and eccentric, some conceal the right inlet, so that the flow velocity on the right side is relatively slow, and the left side is relatively fast. From Figure 2, the receiving inner diameter is combined with the measuring tube of the flow sensor. Compared with the concentricity, the error of eccentricity changes positively, and the change is +(0.1~0.15)% in the case of horizontal eccentricity. (0.45~0.6)%. (2) The influence of the interface shoulder on the flow measurement value When the inner diameter of the inlet connection is smaller than the inner diameter of the measurement tube of the flow sensor, it becomes a sudden expansion tube. The liquid enters the measuring tube to form a stream as shown in Figure 5, which is separated from some other media by the interface, and it disperses and swirls into a violent vortex, which becomes a vortex vortex. As the downflow vortex gradually disappears, the stream spreads to the entire cross-section. If the electrode orientation is in the vortex vortex region, it will affect the flow measurement value. Electromagnetic Flowmeter Sample Display: After Sales and Warranty All products supplied by Dochin Instruments (Shanghai):
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