Selection and installation of sulfuric acid flow meter

Abstract: The information on the selection, installation and use of sulfuric acid flowmeters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Reasonable selection and correct installation of sulfuric acid flowmeter are extremely important to improve measurement accuracy and prolong the service life of the instrument. 1. Selection principle of sulfuric acid flowmeter The sulfuric acid flowmeter includes two parts: transmitter and converter. The main problems of its selection are as follows. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the selection, installation and use of sulfuric acid flowmeters. Reasonable selection and correct installation of sulfuric acid flowmeter are extremely important to improve measurement accuracy and prolong the service life of the instrument. 1. Selection principle of sulfuric acid flowmeter The sulfuric acid flowmeter includes two parts: the transmitter and the converter. The main problem of its selection is how to select the transmitter correctly. The converter only needs to be used together with it. The selection of transmitters should be considered from the following aspects. (1) Selection of caliber and range When selecting a transmitter, you should first determine its caliber and flow measurement range, or determine the flow rate range of the fluid in the transmitter's measurement tube. The full-scale scale of the transmitter is selected according to the maximum flow value expected in the production process, and the common flow rate of the transmitter in use should preferably exceed 50% of the full scale, in order to obtain higher measurement accuracy. After the determination, the diameter is determined according to the relationship between the fluid velocity in the measuring tube and the head loss, and the velocity of 2-4m/s is the most suitable. Usually the diameter of the transmitter is the same as or slightly smaller than the diameter of the pipeline; (2) Selection of working pressure The pressure of the transmitter must be lower than the specified working pressure. At present, the working pressure specifications of the transmitter are: 157 if the diameter is less than ф50mm×10'Pa; ф80-900mm diameter is 980×1O'Pa; larger than ф1000mm diameter is 58.9×10'Pa; (3) Selection of temperature The temperature of the measured medium cannot exceed the allowable temperature of the transmitter lining material, and the medium temperature is also limited by the temperature resistance of electrical insulating materials and enameled wires. Domestic stereotyped transmitters usually work at a temperature of 5 to 60 °C, and some can reach 120 °C. To measure high temperature medium, special specification transmitter should be selected; (4) Selection of lining material and electrode material The lining material and electrode material of the transmitter must be correctly selected according to the physical and chemical properties of the measured medium, otherwise the transmitter will be Corrosion of the lining and electrode is quickly damaged. Therefore, the electrode and lining materials of the transmitter must be correctly selected according to the anti-corrosion experience of the specific measurement medium in the production process. 2. Installation of sulfuric acid flowmeter The installation site of the transmitter should be far away from magnetic sources (such as high-power motors, large transformers, etc.), and there should be no vibration. It is best to install vertically, and the flow direction of the medium should be from bottom to top, so as to ensure that the measuring tube of the transmitter is always full of medium. When it cannot be installed vertically, it can also be installed horizontally, but the two electrodes should be on the same level to prevent the electrodes from being contaminated by precipitation and adsorbed by air bubbles. When installed horizontally, the elevation of the transmitter installation position should be slightly lower than the elevation of the pipeline to ensure that the transmitter measuring tube is filled with medium. In addition, the transmitter should be installed in a dry bath and ventilated place, and should avoid rain, direct sunlight and high ambient temperature. The converter should be installed where the ambient temperature is -10℃~+45℃; relative air humidity≤85% of the installation sites have no strong vibration, and the surrounding gas phase does not contain corrosive gases. The length of the connecting cable between it and the transmitter should generally not exceed 30m. 3. The use of sulfuric acid flowmeter During the use of sulfuric acid flowmeter, the inner wall of the measuring tube may be fouled, and the resistance of the fouling layer is low. In severe cases, the electrode may be short-circuited, and the flow signal will become smaller and smaller or suddenly drop. In addition, the lining of the measuring tube may also be corroded or worn, resulting in short-circuiting of the electrodes, resulting in serious measurement errors, and even the instrument cannot continue to work. Therefore, the transmitter must be regularly maintained and cleaned to keep the inside of the measuring tube clean and the electrodes bright. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Selection, Installation and Use of Sulfuric Acid Flow Meters'

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