Flow meter selection must be considered

Abstract: The selection of flow meter must consider the information provided by the excellent flow meter and flow meter production and quotation manufacturers. The continuous development of the domestic economy and the country's series of measures to save energy consumption have further promoted the demand for flow meters. Especially in the measurement of urban natural gas, coal gas, industrial steam and other various mediums and the internal cost accounting of each order, it is all forced. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the articles that must be considered in the selection of flowmeters. The continuous development of the domestic economy and the country's series of measures to save energy consumption have further promoted the demand for flow meters. Especially in the measurement of urban natural gas, coal gas, industrial steam and other various media and the internal cost accounting of each single, there is an urgent need for measuring instruments with a wide range, high precision and high reliability. Differential pressure flowmeter ranks first in the flowmeter list with its advantages of mature technology, simple structure, no moving parts, stability and reliability, and adaptability to surface width. The composition of the differential pressure flowmeter At present, the differential pressure flowmeter has the following three composition methods: 1. An integrated differential pressure flowmeter, which integrates the throttling device, differential pressure, pressure, temperature, and calculation display into a whole flowmeter. The flow can be displayed directly from the meter, or the measured value can be transmitted remotely through the 4-20mA current. 2 Integrated differential pressure flow transmitter, install the differential pressure transmitter directly on the throttling device, and output a 4-20mA electrical signal representing the magnitude of the differential pressure signal. The flow calculation and temperature and pressure compensation are configured by the user. 3 It consists of a throttling device, a differential pressure transmitter, a pressure transmitter, a temperature transmitter, and a flow calculation and display instrument. Also known as a split differential pressure flowmeter. The third is the traditional composition of differential pressure flow meters, the use of which has dropped significantly in recent years. The second way cannot be called a flowmeter, it has no flow display or output, and is usually called an integrated differential pressure flow transmitter. It is suitable for use as a field instrument in a control system. The 4-20mA differential pressure signal is sent to the control system, and the measured flow is obtained after the control system calculates. The first is the true differential pressure flowmeter, which contains all the necessary elements of a flowmeter. It also represents the development direction of differential pressure flow meters. General principles for selecting flowmeters To correctly and effectively select flow measurement methods and instruments, one must be familiar with the instruments and the characteristics of the fluid being measured. At the same time, economic factors must also be considered. Generally speaking, there are five main factors: performance requirements, fluid characteristics, installation requirements, environmental conditions, and cost. There may be a variety of options for the instrument that can be used in a certain place. If you only make a rash decision based on past experience or simply consider a certain factor, you may lose the possibility of choosing the most suitable instrument. However, it is not a simple matter to combine these factors to come up with the optimal solution. Here are some suggestions based on our years of accumulation for your reference when choosing a flowmeter. 4 Accuracy Accuracy is a very important indicator of a flow measuring instrument, and it is also an important indicator that is easy to ignore in the process of meter selection. Easy to ignore here means that the user does not give further consideration to the accuracy proposed by the manufacturer when selecting the table. Regarding the accuracy of a certain watch indicated by the manufacturer, the question that needs to be further considered when selecting a watch is: 5 The percentage of error refers to the reference error (measurement upper limit or percentage of the range) or relative error. In addition, changes in temperature, pressure and environmental conditions used in the field will generate additional errors. When selecting, the comprehensive system error of the flowmeter should be pursued, and a single accuracy index should not be superstitious. 6 Whether the accuracy level indicated by the manufacturer is in line with common sense. Some manufacturers set the plug-in meter for measuring the flow rate of the plug-in vortex street, turbine, Venturi and other points as±1% or±1.5%. It is obviously unreasonable and belongs to the excessive exaggeration of extending the flow rate measurement accuracy of the insertion head to the flow measurement accuracy. 3. All flow meters except the standard throttling device are non-standard flow meters, and must be calibrated in real flow before leaving the factory to obtain the applicable flow coefficient, so it is necessary to understand the standard device. The ideal flow field of the flowmeter working in the industrial field is to fully develop the turbulent flow. Therefore, the instrument constants and accuracy levels obtained by real-flow calibration on a standard device with fully developed turbulent flow have practical significance. 4. As mentioned above, when choosing a flowmeter, it should pursue its comprehensive system error, rather than superstitious a single accuracy index. For example, what is the accuracy of the same flowmeter whose factory air is calibrated to 1% when it is used for steam measurement? It is a difficult question to answer, and the results will be very different if you choose watches from different manufacturers. The main problem is that the calculation of steam density is very different between manufacturers and various flowmeters. Some flowmeters do not even treat superheated steam and saturated steam differently, and mix the two into one pool, which is even more impossible to talk about. precision.

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