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Six Requirements for Vortex Flowmeter Supplier Installation Location The correct installation of the vortex flowmeter is directly related to the measurement accuracy of the flowmeter, so the correct installation of the vortex flowmeter is crucial. Thermal gas mass flow meters are instruments that measure gas flow using the principle of thermal diffusion. The sensor consists of two reference-grade RTDs. One is a speed sensor RH, and the other is a temperature sensor RMG that measures the change in gas temperature. Vortex flowmeter is a volume flowmeter that measures the volume flow of gas, steam or liquid, the volume flow of standard conditions or mass flow according to the principle of Karman vortex flow. Compressed air flowmeter can be measured by target flowmeter, which not only has the characteristics of traditional orifice plate, turbine, vortex and other flowmeters without moving parts, but also has the measurement accuracy comparable to that of positive displacement flowmeter. Let's get straight to the point. The flowmeter has some special instructions for the installation location. 1. The flow direction mark on each sensor is consistent with the flow direction of the measured medium in the boiler. 2. Installation requirements ensure that the conductive liquid is always filled with the measured medium. 3. Avoid very small amounts of non-corrosive gases in the environment. Floods can be avoided only when the relative ambient temperature is less than 10%—90%. 4. Choose the place where the fluid flows pulsatingly, that is, away from the pressure loss parts of the pump (valves, elbows, etc.). 5. When measuring two-phase fluids, choose a place where complete separation is difficult. 6. Minimize and avoid negative pressure in the measuring pipeline. Requirements for the middle pipe section: 1. The requirements for the various sensors in the upstream straight pipe section are 5 times the diameter of the various sensors. 2. When the channel diameter of the upstream or downstream straight pipe section is inconsistent with the channel diameter of the inductor, an expansion pipe or a tapered pipe with a taper angle less than 150 should be installed and then connected to it. 3. The flow signals generated by other sensors are very weak, usually microvolts and millivolts, so it is very important to prevent external pulse interference. These are the requirements to be aware of when choosing a vortex flowmeter location.
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Abstract: The information on the installation and piping requirements of the turbine flow meter is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. Installation and piping requirements of turbine 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 certain requirements for the upstream and downstream straight pipe sections. For industrial measurements, upstream is generally required. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on the installation and piping requirements of turbine flowmeters. Installation and piping requirements of turbine 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. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Turbine flow meter installation and piping requirements'
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Abstract: The information on the precautions for the use of gas flow meters is provided by excellent flowmeter and flowmeter manufacturers. Precautions for the use of gas flow meters 1. When the working conditions of the instrument change (such as changing the medium, the ambient temperature changes greatly, etc.), the zero position of the instrument should be re-adjusted. At the same time, the conduit of the instrument must be installed horizontally and calibrated with a spirit level. Otherwise will. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the article on the precautions for the use of gas flowmeters. Precautions for the use of gas flowmeters 1. When the working conditions of the instrument change (such as changing the medium, the ambient temperature changes greatly, etc.), the zero position of the instrument should be re-adjusted. At the same time, the conduit of the instrument must be installed horizontally and calibrated with a spirit level. Otherwise, it will increase the influence of working condition changes on zero drift. The rack should not be vibrated or swayed, so it is not suitable for use on ships. 2. Pair is equivalent to 0—A large number of test data in the range of 100kg/cm2 pressure and 0-7 standard liters/hour flow (air) are correlated and calculated, and the linear regression equation is obtained by the principle of least squares, and its correlation coefficientλThe values ​​are all in the range of 0.999 to 0.9999, which proves that the instrument has good linearity. However, the linearity and range size have the larger the flow, the more serious the nonlinearity, so the range is generally limited to within 0 ~ 4 standard liters/hour (air) to ensure good linearity. In order to measure large flow and ensure linearity, the shunt principle can be used to expand the range of the instrument. If the bypass tube, venturi tube, orifice plate, etc. are used together, the range can be expanded to tens, hundreds, thousands of standard liters per hour, up to tens of thousands of standard cubic meters. 3. Although the specific heat of the real gas varies with the pressure, and even some gases vary greatly, the measurement accuracy of the instrument can still be maintained within a certain range. 4. In the selection of conduit materials, in addition to considering corrosion resistance, it is better to choose materials with better thermal conductivity. Taking the measurement of nitrogen as an example, also at 0—100kg/cm2 pressure and 0 to 7 standard liters/hour flow rate, the measurement accuracy of nickel tube is 2 to 2.5% and that of stainless steel is 3 to 4% (the thermal conductivity of nickel is about three times that of stainless steel. ). 5. Since the gas flowmeter can work normally only when the specific heat of the gas is relatively stable, the specific heat value is very unstable in the case of unstable gas composition, fog in the center of the gas, and working conditions approaching the liquefaction critical area of ​​the gas. , should not use this instrument. For example, the critical point of ethylene liquefaction is 50 kg/cm2 and 9.9 °C. When the pressure exceeds 30 kg/cm2 during the test, the meter reading begins to become unstable. 6. If a gas medium is changed, re-calibrate. In the manual of the instrument, it is often introduced not to recalibrate, but to convert the uncalibrated gas flow only according to the specific heat of the two gases. Although it is simple and convenient, it will cause large errors, especially when working under high pressure. It is found that the sensitivity of the instrument is not completely proportional to the specific heat, and it is better to re-calibrate the meter. 7. The instrument must be turned on to preheat before use. Before it is fully preheated, the instrument will be unstable. Better models, the boot warm-up time is less than two hours. 8. During use, when the gas flow changes suddenly, the temperature in the tube must be redistributed through the transfer of heat, so the re-stabilization of the output signal takes a certain amount of time. In order to reduce this hysteresis, the manufacturer often adds a differential network to the electrical circuit of the instrument to make the output signal respond quickly. This is especially necessary when cooperating with other instruments for automatic flow control. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Precautions for the use of gas flow meters'
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The meaning of flow measurement Flow measurement is a science that studies the qualitative change of substances. The law of mutual change between quality and quantity is the basic law of the connection and development of things. Therefore, its measurement object is not limited to the pipeline fluid in the traditional sense, but any fluid flow that needs to be controlled There are problems with flow measurement locally. The industrial production process is a large field of flow measurement and meter application. Flow, temperature, pressure and level are collectively referred to as the four parameters in process control. Everyone monitors and controls the production process through these parameters. Correct measurement and adjustment of fluid flow is the basis for ensuring safe and economical operation of the production process, improving product quality, reducing material consumption, improving economic efficiency, and realizing scientific management. In the entire process detection table, the output of the flow table accounts for about 1^〜1 eight. In power measurement, many flowmeters are used, such as the petroleum industry, from oil extraction, storage and transportation, refining to trading and sales, flowmeters are inseparable from any link. Nowadays, with the vigorous development of the natural gas industry, the measurement of natural gas has attracted everyone's attention, because in the process of natural gas collection, processing, storage, transportation and distribution, millions of flow meters are required, some of which involve The number of settlement amounts is infinite, and the requirements for measurement accuracy and reliability are particularly high. In addition, in the measurement of gas, refined oil, liquefied petroleum gas, steam, compressed air, oxygen, nitrogen, and water, a large number of flow meters are also used, a large part of which is used for transaction settlement, and the measurement accuracy requires Meet the relevant national standards, which puts forward a high demand for flow measurement.
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