The reason and treatment method of A/D saturation of electromagnetic flow meter

Abstract: The information on the causes and treatment methods of A/D saturation of electromagnetic flowmeters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. A/D saturation occurs when the electromagnetic flowmeter is applied, which is usually caused by improper installation and arrangement of the electromagnetic flowmeter or the presence of foreign substances in the medium in the pipeline. The improper installation and arrangement of the electromagnetic flowmeter are mainly manifested in the following aspects: 1. The eccentricity of the sealing gasket (misalignment. More flowmeter manufacturers select models and price quotations, welcome to inquire, the following is the A/D saturation of the electromagnetic flowmeter meter The reasons and treatment methods are detailed in the article. A/D saturation occurs when the electromagnetic flowmeter is applied, which is usually caused by improper installation and arrangement of the electromagnetic flowmeter or the presence of different phases in the medium in the pipeline. Improper installation and arrangement of the electromagnetic flowmeter It is mainly manifested in the following aspects: 1. Eccentricity of the sealing gasket (misalignment with the center). The installation of the sealing gasket is eccentric, which covers part of the flow area and causes the velocity distribution to be seriously distorted and asymmetric. Since the asymmetric flow occurs at the inlet of the flow sensor, That is, the length of the upstream straight pipe section is zero, which will bring measurement errors to the differential pressure, turbine, vortex, ultrasonic, target, electromagnetic and other instruments. For example, the DN50mm electromagnetic flowmeter has a eccentric liner of 10mm, and the measurement error is as high as 4 %～10%. 2. Lack of necessary protective accessories 3. The inner diameter Dg of the sealing gasket between the instrument and the pipe is smaller than the inner diameter Dp of the pipe and the inner diameter Dm of the instrument to generate a beam. Dg should be slightly larger than Dm, such as Dg4. Standard orifice plate The acute angle is not installed on the upstream surface 5. Install the instrument sensitive to vibration interference on the pipeline with vibration 6. The flowmeter is in the wrong flow direction. The inner diameter of the gasket is too small or the installation eccentricity The flow value of instruments such as Coriolis mass type has no or very little effect, but it will increase additional pressure loss. The upstream disturbance source and the downstream disturbance source, the upstream disturbance source includes spiral welded pipes and various types of choke fittings (such as elbows, reducers, branch pipes, and valves), they are divided into two categories according to the type of disturbed flow. The first category has distortion and secondary flow in the velocity distribution; the second category has velocity distribution distortion and secondary flow. There are vortices. The most common types of pipe fittings are elbows and various combinations of elbows (such as flat double elbows and three-dimensional double elbows). The sensitivity of various flow instruments to upstream flow disturbances is different, so it is necessary to propose The respective installation requirements. The downstream disturbance sources are mainly elbows, valves, etc. The disturbances formed by the fluid flow will propagate upward, which can affect the distance of several times the pipe diameter. In most cases, the downstream straight pipe section of 5 times the pipe diameter It is enough; some special cases may be slightly longer, but it can be considered that the downstream straight pipe section of 10 times the pipe diameter can reliably cope with the disturbance generated by any downstream pipe fittings. If the length of the straight pipe section cannot meet the requirements, the measurement accuracy must be guaranteed , one of the following two workarounds can be taken: 1) Install a flow conditioner upstream of the meter as described in the following section. 2) Calibrate under the field installation conditions, or calibrate on the laboratory real flow calibration device together with the disturbance blocker and the instrument under the same field installation conditions. Reasons for the mixing of different phases in the mass: 1. Gas (bubble) mixed in the liquid 2. Wear and deposition scaling 3. Condensate in the gas 4. Errors in the formation of cavitation The above is the entire content of this article, you are welcome to inquire My manufacturer's flowmeter selection, quotation and so on. 'The reason and treatment method of A/D saturation of electromagnetic flow meter'

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