Installation and debugging work before use of intelligent turbine flow meter

Abstract: The information on the installation and commissioning of the intelligent turbine flowmeter before use is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Installation and use of turbine flowmeter In order to give full play to the characteristics of turbine flowmeter, full attention must be paid to the installation and use of flowmeter. This issue is briefly discussed below. (1) Measured medium The liquid measured by the turbine flowmeter is general. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the installation and commissioning work before the use of intelligent turbine flowmeters. The installation and use of the turbine flowmeter In order to give full play to the characteristics of the turbine flowmeter, full attention must be paid to the installation and use of the flowmeter. This issue is briefly discussed below. (1) The liquid measured by the measured medium turbine flowmeter is generally low viscosity (generally less than 15×l0-6m2/s), low corrosive liquid. Although there are turbine flowmeters for measuring various media, the measurement of high temperature, high viscosity and strong corrosive media still needs to be carefully considered and corresponding measures should be taken. When the medium viscosity v is greater than 15×When l0-6m2/s, the meter coefficient of the flowmeter must be calibrated in real liquid, otherwise a large error will occur. Tip: Gas-liquid two-phase flow, gas-solid two-phase flow, and concentrated-solid two-phase flow cannot be measured by turbine flowmeter. (2) Installation and piping requirements The installation of the flowmeter has a great influence on the measurement accuracy of the flowmeter. 1. The uneven distribution of flow velocity and the existence of secondary flow in the pipe are important factors that affect the measurement accuracy of the turbine flowmeter. Therefore, the turbine flowmeter has a certain effect on the upstream and downstream straight pipe sections.—set requirements. For industrial measurement, a straight pipe length of 20D upstream and 5D downstream is generally required. To eliminate secondary flow, it is best to install a rectifier at the upstream end. If the upstream end can be guaranteed to have a straight pipe section of about 20D, and a rectifier is installed, the measurement accuracy of the flowmeter can reach the accuracy level at the time of calibration. 2. Turbine flowmeters have high requirements on the cleanliness of the fluid. A filter must be installed before the flowmeter to ensure the cleanliness of the fluid. The filter can be a funnel type, and its own cleanliness can be obtained by measuring the change of the differential pressure at both ends. 3. In order to ensure that the liquid passing through the flowmeter is single-phase, that is, no air or vapor can enter the flowmeter, an air eliminator should be installed upstream of the flowmeter when necessary. For easily vaporized liquids, a certain back pressure must be ensured downstream of the flow meter. The size of the back pressure can be twice the pressure drop of the flow sensor at the maximum flow rate plus 1.2 times the vapor pressure of the liquid to be measured at the maximum temperature. (3) Signal transmission line In order to ensure that the display instrument has sufficient sensitivity to the pulse signal output by the turbine sensor, it is necessary to improve the signal-to-noise ratio. For this reason, various electrical interference phenomena, namely electromagnetic induction, electrostatic and capacitive coupling, should be prevented during installation. Therefore, when configuring the signal transmission line, you must pay attention to the following points: 1. Limit the maximum length of the signal line. The maximum length of the signal line is, L=dV; among them, V is the effective value of the output voltage of the sensing coil at the minimum flow rate, mV; d is the coefficient, m/mV, and its value is desirable: when V<1000mV, d=1.0 ; When 1000 mV5000mV, d=2.0. 2. Shielded cable should be used for signal transmission line to prevent induced noise from outside. The transmission cable is required to be shielded and grounded at the display instrument end. Transmission cables cannot be close to strong electromagnetic equipment, and are not allowed to be arranged in line with power lines. (4) Operation and maintenance ① When the pipeline of the turbine flowmeter needs to be cleaned, the bypass must be opened, and the cleaning liquid cannot pass through the flowmeter. ②When the pipeline system is started, the bypass must be opened first to prevent the sudden increase of the flow rate, which will cause the turbine to rotate too much and be damaged. ③The turbine flowmeter bearing should be replaced regularly. Generally, the wear of the bearing can be observed according to the change of small flow characteristics. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Installation and debugging work before use of intelligent turbine flow meter'

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