Abstract: The information on the characteristics and installation requirements of the new liquid turbine
flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. Features and installation requirements of the latest liquid
turbine flowmeters 1． Features of Turbine Flowmeters As can be seen from the previous discussion, a turbine flowmeter is a flow meter with many advantages. To sum up, it has the following characteristics. (1) The accuracy of the turbine flowmeter is high. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the characteristics and installation requirements of Z new liquid turbine flowmeters. Features and installation requirements of the latest liquid turbine flowmeters 1 . Features of Turbine Flowmeters As can be seen from the previous discussion, a turbine flowmeter is a flow meter with many advantages. To sum up, it has the following characteristics. (1) High accuracy The accuracy of the turbine flowmeter is about (0.5-0.1)%. In the linear flow range, even if the flow changes, the accumulative flow accuracy will not decrease. And in a short time, the reproducibility of the turbine flowmeter can reach 0.05%. (2) Wide range ratio The range ratio of the turbine flowmeter can reach 8—10. Under the same caliber, the maximum flow value of the turbine flowmeter is larger than that of many other flowmeters. (3) The adaptable turbine flowmeter can be made into a closed structure, and its rotational speed signal is non-contact measurement, so it is easy to achieve high-pressure design. If the turbine and bearing of the flowmeter are made of materials with high temperature resistance and small thermal expansion coefficient, they can be used in a wide temperature range. At this time, attention should be paid to the correction of its meter coefficient (mainly the change of its flow section): K=K0[1-(R+2H)(t-to)] (3-23) where K, K0——Meter coefficient during use and calibration; t, t0——Fluid temperature during use and calibration; R, H are the material expansion coefficients of turbine and casing, respectively. (4) Digital signal output The output of the turbine flowmeter is a pulse digital signal proportional to the flow rate. It has the advantages of not reducing the accuracy during the transmission process, easy to accumulate, and easy to send into the computer system. 2. 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. The following is a brief discussion of this issue. (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 used 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 there will be a large error. 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. ①The uneven distribution of flow velocity and the existence of secondary flow in the pipe are important factors that affect the measurement accuracy of turbine flowmeter. Therefore, the turbine flowmeter has a certain effect on the upstream and downstream straight pipe sections.—Set requirements. For industrial measurement, the straight pipe length of 20D upstream and 5D downstream is generally required. In order to eliminate the 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. ②The turbine flowmeter has high requirements on the cleanliness of the fluid, and 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 liquids that are easily vaporized, a certain back pressure must be guaranteed downstream of the flow meter. The size of the back pressure can take twice the pressure drop of the flow sensor under the maximum flow rate plus 1.2 times the vapor pressure of the liquid to be measured under 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 mV＜d＜5000 mV, d=1.5; when V＞5000mV, d=2.0. ②The signal transmission line should use shielded cable to prevent induced noise from the outside. The transmission cable is required to be shielded and grounded at the display instrument end. The transmission cable cannot be close to the strong electromagnetic equipment, and it is not allowed to be arranged in line with the power line. (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 piping 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. 'Characteristics and installation requirements of the new liquid turbine flow meter'
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