The flow measurement instrument selection guidelines

Abstract: the selection of flow measurement instrument information information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. By analyzing the principle of flow measurement, site conditions and the measurement requirements, correctly selecting flow meter, the instrument performance meet the requirements of actual operation parameters of choose and buy, to achieve the purpose of accurate measurement. This article combined with author's working practice, a few years talk about flow measuring instrument. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the flow measurement instrument selection information article for details. By analyzing the principle of flow measurement, site conditions and the measurement requirements, correctly selecting flow meter, the instrument performance meet the requirements of actual operation parameters of choose and buy, to achieve the purpose of accurate measurement. In this paper, combined with years of practice, the writer discuss the selection of flow measuring. 1 first determine whether need to install the flow meter if only want to know whether in conveying flow of fluid, observing the general flow, then choose flow peep window or flow indicator can achieve this purpose at a lower cost. Due to its simple structure, domestic flow meter manufacturing to peep window and flow indicator attaches great importance to the propaganda is not enough, only a few enterprises to provide product, in contrast, petrochemicals, steam turbine and other complete sets of equipment imported from abroad, the more points with flowing peep window or indicator. If the measurement demand is high, the need to install a flow meter. Should make full use of the site conditions, don't have to be specially flow sensor installation, can use a bend in the pipe system, measurements can also have other resistance (fluid pipe section Such as T tube) The pressure drop, usually also can achieve the same purpose. The relationship between flow rate and differential pressure, some simplified assumptions can be made through the calculation, Such as bend) , or use the outer clamp portable ultrasonic flowmeter in the upstream section of the resistance ( Or downstream) Piping proper place online check. 2 sample analysis factors to collect all kinds of instruments, selection of technical data and manuals, and fully understand the various instrument performance specifications; Again, respectively, according to the performance requirements and instrument specifications, fluid properties, installation location, environmental conditions and economical factors in five aspects, according to the question, analyze, compare list. Different objects have their respective measurement purposes, have different emphasis on its performance in the instrument. For example, business accounting and storage and transportation of high accuracy requirements; Continuous measurement process control usually require good reliability and repeatability, sometimes also requires a wide measurement range, measurement accuracy requirements and the subsidiary; Ratio of bulk production, hope to have good precision, etc. Usually consider order from & other; Performance requirements and instrument specifications & throughout; Start, appropriate to consider other factors. If think & other; Economic factors & throughout; Is the main factor ( If big diameter conveying pump, low cost, small business accounting measurement error) And other factors as the secondary factor. 3 not simply measuring the total fluid measurement such as precision, but the application in the fluid flow control system, the instrument measuring precision sure you want to in the whole system under the control accuracy requirement, because the whole system not only has the traffic detection error, also contains a signal transmission, control and operation of error and various influence factors, such as operation link tend to have about 2% back to the poor, on the accuracy of the measuring instrument to determine the high ( For example 0 & middot; Level 5) It is not reasonable and not economic. In terms of flow meter itself, the detecting element ( Or sensors) And should also be appropriate to determine the accuracy of the conversion between display instrument, such as without real velocity-equalizing tube flow calibration, wedge pipe, pipe bending arithmetic at zero pressure device error & middot; Between 5% ~ 5%, choose high precision differential pressure gauge to match there would be no sense ( At present our factory used ROSEMOUNT3051 mark error in 0 & middot; 075%) 。 The accuracy of the flow meter specifications as shown in the rating is in a wide flow rate range, if the conditions of use in a particular flow or flow range is very narrow, the use of e. high measuring accuracy comparable; If you can in this special calibration measurement point, can improve the accuracy, such as from 0 & middot; Level 5 to 0 & middot; 25 level or higher. Used for business accounting, storage and transportation, and material balance requires high precision, accuracy should also be considered persistent, is easy to be check key factors, such as, as well as about the possibility of online check. Four repetitive repeatability in process control applications are important indicators, the principle and manufacturing quality is decided by the instrument itself, and besides depends on repeatability, precision is related to the value calibration system. Strictly speaking repeatability refers to the environmental conditions, the medium parameters such as the same case, same direction for a period of time of a * value in measuring the consistency of the many times. In practical application, however, instrument excellent repeatability influenced by many factors including fluid viscosity and density change, often mistaken for instrument repeatability is not good.

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