Small caliber LDE electromagnetic flowmeter LDE-20 anti-corrosion electromagnetic flowmeter

Description :

　　This product can be widely used in fields such as chemical, steel, coal, mining and metallurgy, petroleum extraction, petrochemicals, papermaking, environmental protection, sugar production, pharmaceuticals, food, water conservancy and irrigation, water supply and drainage, and port dredging.

　　1、 Structure

　　1. Magnetic circuit system: Its function is to generate a uniform DC or AC magnetic field. The DC magnetic circuit is implemented by a magnet, which has the advantage of a relatively simple structure and less interference from the AC magnetic field. However, it is easy to polarize the electrolyte liquid inside the measuring tube, causing the positive electrode to be surrounded by negative ions and the negative electrode to be surrounded by positive ions, that is, the polarization phenomenon of the electrodes, and causing an increase in the internal resistance of the two electrodes, thus seriously affecting the normal operation of the instrument.

　　2. Measurement catheter: Its function is to allow the measured conductive liquid to pass through. In order to divert or short-circuit the magnetic flux when the magnetic lines pass through the measurement catheter, the measurement catheter must be made of non-magnetic, low conductivity, low thermal conductivity, and materials with certain mechanical strength. Non magnetic stainless steel, fiberglass, high-strength plastic, aluminum, etc. can be selected.

　　3. Electrode: Its function is to generate an induced potential signal proportional to the measured value Electrodes are generally made of non-magnetic stainless steel and are required to be flush with the lining so that fluid can pass through without obstruction Its installation position should be in the vertical direction of the pipeline to prevent sediment from accumulating on it and affecting measurement accuracy.

　　2、 Installation

　　In order to ensure the stable and reliable operation of the flowmeter, the following requirements should be noted when selecting the installation location:

　　1. Try to avoid ferromagnetic objects and equipment with strong electromagnetic fields (such as large motors, transformers, etc.) to prevent the magnetic field from affecting the working magnetic field and flow signal of the sensor.

　　2. It should be installed in a dry and ventilated place as much as possible, avoiding direct sunlight and rain. The ambient temperature should be between -20 and+60 ℃, and the relative humidity should be less than 85%.

　　3. There should be ample space around the flowmeter for easy installation and maintenance.

　　Installation recommendations

　　The measurement principle of electromagnetic flowmeter does not depend on the characteristics of flow rate. If there is a certain amount of turbulence and vortex generated in the non measurement area of the pipeline (such as bends, tangential flow restrictions, or partially open shut-off valves upstream), it is irrelevant to the measurement. If there is a steady-state eddy current in the measurement area, it will affect the stability and accuracy of the measurement. In this case, some measures should be taken to stabilize the flow velocity distribution:

　　a. Increase the length of the front and rear straight pipe sections;

　　b. Adopting a traffic stabilizer;

　　c. Reduce the cross-section of measurement points.

　　Horizontal and vertical installation

　　Sensors can be installed horizontally and vertically, but it should be ensured to avoid the influence of sediment and bubbles on the measuring electrode, and the electrode axis should be kept horizontal. When installed vertically, the fluid should flow from bottom to top.

　　3、 Selection

　　Firstly, it is necessary to have a profound understanding of the structural principles and fluid characteristics of flow meters, while also selecting based on the specific situation on site and the surrounding environmental conditions. We also need to consider economic factors. In general, the selection should be made from the following five aspects: ① Performance requirements for flow meters; ② Fluid characteristics; ③ Installation requirements; ④ Environmental conditions; ⑤ The price of the flow meter.

　　Collect data from flow meters for personal selection and decision-making.

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• Small caliber LDE electromagnetic flowmeter