How to choose and install sewage flow meter

Abstract: The information on how to select and install sewage flow meters is provided by excellent flow meter and flow meter manufacturers. Reasonable selection and correct installation of sewage flow meters are very important to ensure measurement accuracy and prolong the service life of the instrument. The following is a brief introduction to the selection principle of sewage flowmeter, installation conditions and precautions for use. (1) Sewage flow meter. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details on how to choose and install sewage flowmeters. Reasonable selection and correct installation of sewage flow meters are very important to ensure measurement accuracy and prolong the service life of the instrument. The following is a brief introduction to the selection principle of sewage flowmeter, installation conditions and precautions for use. (1) Selection principle of sewage flowmeter The selection of sewage flowmeter is mainly the correct selection of transmitter, and the converter only needs to be matched with it. 1. Selection of caliber and range The caliber of the transmitter is usually the same as that of the piping system. If the piping system is to be designed, the diameter can be selected according to the flow range and flow rate. For electromagnetic flowmeters, the flow rate is 2—4m/s is more suitable. In special cases, such as the liquid with solid particles, considering the wear situation, the usual flow rate can be selected≤3m/s, for easy-to-manage fluids. Optional flow rate≥2m/s. After the flow rate is determined, the diameter of the transmitter can be determined according to qv= D2. The range of the transmitter can be selected according to two principles: one is that the full scale of the instrument is greater than the expected maximum flow value; the other is that the normal flow is greater than 50% of the full scale of the instrument to ensure a certain measurement accuracy. 2. Selection of temperature and pressure The fluid pressure and temperature that the sewage flowmeter can measure is limited. When selecting, the operating pressure must be lower than the working pressure specified by the flowmeter. At present, the working pressure specifications of domestic sewage flowmeters are: less than 50mm diameter, working pressure is 1.6MPa, 900mm diameter, working pressure is 1MPa; larger than 1000mm diameter, working pressure is 0.6MPa. If you have special requirements for the pressure resistance of the transmitter, you can negotiate with the manufacturer. Some manufacturers have been able to manufacture electromagnetic flow transmitters with a pressure resistance of 32MPa. The operating temperature of the sewage flowmeter depends on the lining material used, generally 5—70℃. If special treatment is done, it can exceed the above range, and the transmitter allows the temperature of the measured medium to be—40 ten 130 ℃. 3. Selection of lining material and electrode tree material The lining material and electrode material of the transmitter must be correctly selected according to the physical and chemical properties of the medium, otherwise the instrument will be damaged quickly due to the corrosion of the lining and electrode, and the corrosiveness is very strong. Once the medium leaks, it is easy to cause an accident. Therefore, the materials of electrodes and linings must be carefully selected according to the specific measurement medium in the production process. (2) The installation of sewage flowmeter To ensure the measurement accuracy of sewage flowmeter, correct installation is very important. ①The transmitter should be installed in a dry and ventilated place indoors. Avoid installing in places with high ambient temperature, should not be subjected to strong vibration, and try to avoid equipment with strong magnetic fields, such as large motors, transformers, etc. Avoid installing in places with corrosive gas. The installation site is convenient for maintenance. This is the environmental condition to ensure the normal operation of the transmitter. ②In order to ensure that the measuring tube of the transmitter is filled with the measured medium, the transformer should be installed vertically, and the flow direction is from bottom to top. Especially for liquid-solid two-phase flow, it must be installed vertically. If only horizontal installation is allowed on site, it must be ensured that the two electrodes are on the same horizontal plane. ③ Valves and bypasses should be installed at both ends of the transmitter. ④ The AC potential of several millivolts measured by the electrode of the electromagnetic flow transmitter is based on the liquid potential in the transmitter. In order to stabilize the liquid potential and keep the equal potential between the transmitter and the fluid to ensure stable measurement, the transmitter casing and both ends of the metal pipe should be well grounded, and the converter casing should also be grounded. The grounding resistance cannot be greater than 10, and cannot be shared with the grounding wire of other electrical equipment. If it is not possible to ensure good contact between the transmitter housing and the metal pipes, use metal wires to connect them. And then reliable grounding. ⑤ In order to avoid interfering signals, the signal between the transmitter and the converter must be transmitted with shielded wires. It is not allowed to put the signal cable and the power cable in parallel in the same cable steel pipe. The length of the signal cable should generally not exceed 30m. ⑥ The installation site of the converter should avoid strong AC and DC magnetic fields and vibration, and the ambient temperature is—20-50℃, no corrosive gas, relative humidity not more than 80%. ⑦ In order to avoid the influence of the relative measurement of the flow rate, the flow control valve should be set downstream of the transmitter. For small-diameter transmitters, since the distance from the center of the electrode to the inlet end of the flowmeter is equivalent to several times the length of the diameter D, the upstream straight pipe may not be specified. However, for flowmeters with larger diameters, there should generally be a straight pipe section above 5D in the upstream, and generally no straight pipe section is required in the downstream. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'How to select and install sewage flow meter'

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