Schematic diagram of the installation of the measurement system of the balance flow meter

Abstract: The information on the installation schematic diagram of the measurement system of the balance flow meter is provided by the excellent flow meter and flow meter production and quotation manufacturers. 1. The installation of the balance valve and the three-valve group requires the function of the balance valve or the three-valve group (1) to adjust the zero point of the differential pressure transmitter (2) to prevent the positive and negative of the differential pressure transmitter and the overpressure of the pressure chamber, please refer to the method shown in the figure below Connect to the impulse piping. 2. Installation of differential pressure transmitter. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the installation diagram of the balance flowmeter measurement system. The article details. 1. The installation of the balance valve and the three-valve group requires the function of the balance valve or the three-valve group (1) to adjust the zero point of the differential pressure transmitter (2) to prevent the positive and negative of the differential pressure transmitter and the overpressure of the pressure chamber, please refer to the method shown in the figure below Connect to the impulse piping. 2. Installation requirements of differential pressure transmitter (1) Introduce the pressure pipe of the balance flowmeter into the positive pressure chamber of the differential pressure transmitter, and then introduce the pressure pipe of the negative pressure side of the balance flowmeter into the three valve group. The negative pressure chamber connected to the differential pressure transmitter (2) The installation position of the differential pressure transmitter on the process pipeline is related to the measured medium. In order to obtain a better installation effect, the following conditions should be considered. Corrosive or overheated medium to be tested is in direct contact with B To prevent dross from depositing in the impulse pipe and block it C The lengths of impulse pipes on both sides of positive and negative pressure should be the same as possible D The head of liquid column in impulse pipes on both sides of positive and negative pressure should be maintained Balance E The pressure pipe is installed in the place where the temperature gradient and temperature fluctuation are the smallest. The pressure transmitter should be installed beside or above the pipeline under test, so that the accumulated liquid can easily flow into the pipeline. in the pressure tube. Special attention should be paid to prevent the temperature of the differential pressure transmitter from contacting the medium when measuring steam or other high-temperature media to exceed the limit temperature of the transmitter. 3. Installation requirements for temperature and pressure transmitters 1. When measuring superheated steam medium, it is necessary to add temperature integrated transmitter and pressure transmitter for dynamic compensation. When measuring saturated steam medium, a pressure transmitter must be added for dynamic compensation. 2. When measuring natural gas and gas medium, a pressure transmitter must be added for dynamic compensation, and a transmitter with safety barrier and explosion-proof device must be used. 3. When measuring hot water medium, when heat display is required, an integrated temperature transmitter must be added, otherwise the integrated temperature transmitter can be omitted. 4. The temperature integrated transmitter is installed on the pipeline under test, and the temperature probe should be inserted into the top of the temperature probe beyond the first 5D pipe section or the rear 2D straight pipe section to ensure the measurement accuracy. 5. The pressure taking point of the differential pressure transmitter must be outside the 5D straight pipe section in front of the balance flowmeter or the 2D straight pipe section after the balance flowmeter, and an on-off valve must be installed in between. For the installation of temperature integrated transmitter and pressure transmitter, in principle, the requirements of this system can be met as long as the conventional installation specifications are met. For specific installation requirements, please refer to their respective installation instructions. 4. Commissioning and operation After the installation is completed according to the installation principles and procedures, before the system commissioning, check whether all equipment, pipes, valves, connectors, wires, terminals, signal plugs, etc. are complete, correct and reliable, and whether the pipes and equipment are blocked. , leakage phenomenon, whether the wires and signal connection points are wrongly connected, short-circuited, disconnected, poor contact, etc., the system debugging can be carried out after checking and confirming that there is no error. The debugging steps are as follows: 1. The pressure pipe is drained: (1) Open the pressure taking valves on both sides of the balance flowmeter (note: all valves must be opened); (2) Close the positive and negative pressure valves on both sides of the three-valve group, and open the balance valve in the middle; The side positive and negative pressure sends no valve to open for sewage. Clean the impulse tube. 2. Condensation of the pressure pipe: (1) Close the drain valve and let the medium naturally condense in the pressure pipe until the entire pipe is filled with condensed water (about 4 hours). (2) When there is enough condensed water in the pressure-inducing pipe, the positive and negative pressure valves on both sides of the three-valve group can be opened (the balance valve in the middle is still open at this time), so that the condensed water enters the differential pressure changer respectively. In the positive and negative pressure chamber of the transmitter. Since the deposition of condensed water takes a certain amount of time, the displayed value of the differential pressure transmitter will not be accurate at first, until the condensed water completely fills the entire measurement system (including the pressure-taking body, the pressure-inducing pipe, and the positive pressure of the differential pressure transmitter). After the negative pressure chamber), the indicator of the differential pressure transmitter tends to be normal (about 2 hours). 3. Exhaust of the differential pressure transmitter: In order to ensure that the residual air in the positive and negative pressure chambers of the differential pressure transmitter is removed cleanly,Put the exhaust gas on the positive and negative pressure chambers of the transmitter. 4. Zero adjustment of the differential pressure transmitter: a) Close the exhaust valve on the positive and negative pressure chambers of the differential pressure transmitter. b) Close the positive and negative pressure valves on both sides of the three-valve group (the balance valve in the middle is still open at this time). (See the picture below) The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Balance flow meter measurement system installation diagram'

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