Rules for selection and installation of electromagnetic flowmeters

Abstract: The law information of electromagnetic flow meter selection and installation is provided by excellent flow meter and flow meter manufacturers. The rules for selection and installation of electromagnetic flowmeters: 1. First, clarify the measurement requirements of this unit. There are several measurement requirements, mainly including: measurement medium, flow m3/h (minimum, operating point, maximum), medium temperature ℃, medium Pressure MPa, installation method. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the article on the selection and installation of electromagnetic flowmeters. The rules for selection and installation of electromagnetic flowmeters: 1. First, clarify the measurement requirements of this unit. There are several measurement requirements, mainly including: measurement medium, flow m3/h (minimum, operating point, maximum), medium temperature ℃, medium Pressure MPa, installation method (pipeline or piercing), etc. 2. Conditions for selection (electromagnetic flowmeter) 1. The measured medium must be a conductive liquid (that is, the measured fluid needs to have the lowest limit of electrical conductivity). 2. The measured medium should not be rich in ferromagnetic medium or many bubbles. 3. The measurement principle of electromagnetic flowmeter should be known. The measurement principle is based on Faraday's law of electromagnetic induction, that is, when the flow is measured, the fluid flows through a magnetic field perpendicular to the direction of movement, and the movement of the conductive fluid induces a uniform flow rate (also known as volume flow rate). ) is proportional to the voltage, the voltage signal is detected by two electrodes in direct contact with the fluid, and transmitted to the amplifier through the cable, which is then converted into an output signal. Fourth, you should know the main features of the electromagnetic flowmeter. The main features are: (1) There is basically no pressure loss in the measuring tube, it is not easy to block, and it has common adaptability to the measurement of slurry; (2) The demand for straight pipe sections is low; (3) The low-frequency rectangular wave excitation is not immune to Due to the influence of power frequency and on-site distribution and disturbance, the operation is stable and reliable; (4) The body of the transmitter can be made of all stainless steel, and it has anti-acid, anti-alkali and anti-corrosion capabilities after adding fabric materials; Chip, parameter setting is convenient; ⑹ The transmitter can be equipped with a self-calibration system, which can self-calibrate the transmitter constants and factory calibration values ​​at any time, which is convenient for debugging and maintenance; ⑺ Wide measurement range, full-scale flow rate setting can be at 0.3m/s—12m/s scale; ⑻ its piercing type can be installed or disassembled under the condition of continuous flow; ⑼ wide application scale: it can be used in chemical industry, metallurgy, papermaking, food, petroleum, urban water supply and other fields. Five, the key to the selection of the type 1, the first clear is to choose the pipeline type ') electromagnetic flowmeter'), or the penetration type electromagnetic flowmeter. 2. Under normal circumstances, the electromagnetic flowmeter without display on site is selected, and the output 4-20mA (or 0-10mA) current signal is sent to the secondary surface of the control room and the flow rate and total amount can be displayed. 3. If the focus is on the investigation of the flow in the pipeline during on-site operation, the on-site display type electromagnetic flowmeter can be selected. 4. When the environmental requirements or the measurement accuracy requirements are high, the safe voltage intelligent electromagnetic flowmeter can be selected. 5. For installation and disassembly of large pipe diameters above 200mm to measure flow or continuous flow, penetrating or enhanced penetrating electromagnetic flowmeters can be preferred. 6. The key to the selection of the sensor diameter 1. The diameter of the sensor is the same as the diameter of the connected technical pipeline, and its advantage is that the installation is convenient (no reducer pipe is required); the condition is that the flow rate of the fluid in the pipe must be within 0.3m/s—Within the scale of 10m/s; its applicable condition is that it is used in the early stage of the project and the fluid velocity in the pipe is low. 2. The diameter of the selected sensor is different from the diameter of the connected technical pipeline. Its applicable conditions: (1) The flow rate is low and the flow rate is stable; (2) The cost performance is reduced: Seven, the selection of fabric materials is mainly based on the corrosiveness and wear of the company's measured medium. and temperature, selected by the orderer, please refer to the“Fabric data function and applicable scale table”. 8. The selection of electrode materials is based on the corrosiveness of the measured medium of our company, which is selected by the orderer. Please refer to the information provided by each manufacturer.“Electrode data corrosion resistance function table”. 9. The selection of protection level is based on the national standard GB4208-84. The protection level of the shell is as follows: if the surface device is below the ground and is often flooded, the diving type should be selected; if the surface device is on the surface, the water-proof type should be selected. . 10. Selection of upper limit flow 1. Usually, the diameter of the transmitter is selected to be the same as the diameter of the connected piping. Because there are strict functions of diameter, flow rate and flow rate, when selecting, you can refer to the upper limit flow table of the electromagnetic flowmeter provided by the manufacturer, and select the upper limit flow value under the corresponding diameter. 2. It cannot be achieved because the flow rate in the technical piping is low.“1”When the minimum upper limit flow value under the corresponding diameter is selected, the diameter of the transmitter can be selected to be smaller than the diameter of the technical piping, that is, a reducer is added before and after the transmitter. 11. Selection of installation method 1. Integral type: The sensor and conversion part of the flowmeter are integrated into one, and the advantage is that it is easy to install.
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