Selection instructions for flow measuring instruments

Abstract: The information on the selection of flow measuring instruments is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. By analyzing the flow measurement principle, site conditions and measurement requirements, the flow meter is selected correctly, so that the performance of the purchased meter can meet the requirements of actual operating parameters, and the purpose of accurate measurement can be achieved. This article combines the author's work practice for several years to talk about the flow measuring instrument. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the article selection instructions for flow measuring instruments. By analyzing the flow measurement principle, site conditions and measurement requirements, the flow meter is selected correctly, so that the performance of the purchased meter can meet the requirements of actual operating parameters, and the purpose of accurate measurement can be achieved. Based on the author's work practice for several years, this article discusses the selection of flow measuring instruments. 1. First determine whether you need to install a flow meter. If you only want to know whether the fluid in the pipeline is flowing and observe its general flow, you can use a flow peep window or a flow indicator to achieve this purpose at a lower cost. Due to its simple structure, the domestic flow meter manufacturing industry does not pay enough attention to the propaganda of peep windows and flow indicators, and only a few companies provide products. peephole or indicator. If the measurement requirements are high, a flow meter needs to be installed. The site conditions should be fully utilized, and it is not necessary to specially install the flow sensor. The elbow in the pipeline system can also be used to measure the pressure drop of other bluff pipe sections (such as T-shaped pipes), which can usually achieve the same purpose. The relationship between flow rate and differential pressure can be calculated by making some simplified assumptions (such as elbows), or by using an externally clamped portable ultrasonic flowmeter at a suitable position in the upstream (or downstream) piping system of the resistance pipe section. 2 Analyze factors to collect various instrument samples, technical data and selection manuals, etc., to fully understand the specifications and performance of various instruments; The questions raised later are analyzed one by one and compared in a list. Different measurement objects have their own measurement purposes, and have different emphases on instrument performance. For example, commercial accounting and storage and transportation have high requirements for accuracy; continuous measurement process control usually requires good reliability and repeatability, and sometimes requires a wider measurement range, while the measurement accuracy requirements are placed in a secondary position; batch distribution Better accuracy than production is expected. The order of consideration generally starts with“Performance Requirements and Instrument Specifications”To start, take other factors into consideration as appropriate. if you think“economic factors”are the main factors (such as large pipe diameter transportation requires low pumping costs, and commercial accounting requires small measurement errors), while other factors are secondary factors. 3. If the fluid measurement is not simply measuring the total amount, but is applied in the flow control system, the determination of the accuracy of the detection instrument should be carried out under the control accuracy requirements of the entire system, because the entire system not only has the error of flow detection, but also It also includes errors and various influencing factors in signal transmission, control adjustment, operation execution and other links. For example, the operation execution link often has a hysteresis of about 2%, which is too high for the measuring instrument (for example, 0·5) is unreasonable and uneconomical. As far as the flow meter itself is concerned, the accuracy between the detection element (or sensor) and the conversion display instrument should also be properly determined.·Between 5% and 5%, it is meaningless to choose a high-precision differential pressure gauge to match it (currently, the ROSEMOUNT3051 used by our factory has a marked error of 0·075%). The accuracy level shown in the flow meter specification is within a wide flow range. If the operating conditions are in a specific flow or a very narrow flow range, the measurement accuracy used at this time can be higher than the specified value; if it can be specified here The measuring point is specially calibrated to improve the accuracy, for example from 0·Level 5 increased to 0·Level 25 or higher. When it is used for commercial accounting, storage and transportation and material balance requiring high accuracy, key factors such as the durability of the accuracy, whether it is easy to re-calibrate, and whether there is the possibility of online calibration should also be considered. 4 Repeatability Repeatability is a very important indicator in process control applications, which is determined by the principle of the instrument itself and the manufacturing quality, and the accuracy is not only dependent on repeatability, but also related to the value calibration system. Strictly speaking, repeatability refers to the consistency of multiple measurements in the same direction for a certain value over a period of time under the condition of constant environmental conditions and medium parameters. However, in practical applications, the excellent repeatability of the instrument is affected by many factors including fluid viscosity, density and other changes, and it is often mistaken for the poor repeatability of the instrument. Therefore, in places with parameter changes, do not choose an instrument that is sensitive to this parameter change. For example, the rotameter is easily affected by the fluid density, and the turbine flowmeter is easily affected by the fluid viscosity when it is used for high viscosity measurement.

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