MEASUREMENT SYSTEMS OF THE FLOW RATE AND QUANTITY OF FLUID OF VARIABLE
DIFFERENTIAL PRESSURE: THE REVIEW AND ANALYSIS OF ACHIEVEMENTS IN THE LAST DECADES 

Daev Zhanat Arikkulovich, candidate of technical sciences, associate professor, sub-department of technical and natural sciences, Kazakh-Russian International University (52 Aiteke bi street, Aktobe, Republic of Kazakhstan), zhand@yandex.ru

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Background. Measurement of flow rate and the quantity of substances is one way to achieve energy efficiency in the various industries. Variable differential pressure flow measurement systems are very special type of the instrumentation among the large number of flow measurement techniques and systems. The purpose of this article is to provide an overview of the latest achievements in the field of improving accuracy and efficiency of these systems and make their analysis, which would allow focusing of stakeholders on the existing method problems.
Materials and methods. As a part of the work was made an analysis of the quantitative distribution of the method and measurement systems based on variable pressure drop, examined and studied the proportion of the flow distribution systems market over the past two decades.
Results. The paper shows that the share of the spread of traditional flow measurement technologies takes half the market of the flow measurement equipment. The value of the distribution of the considered measuring systems remains the most popular and high. The article shows the main areas within which research is underway to improve the method. 
Conclusions. This analysis shows that the improving methods of the accuracy and reliability of functioning of these measurement systems are possible to consider by separation on ways to improve hardware and on algorithmic ways to increase efficiency.

flow, flowmeters, differential pressure, measurement system, liquid, gas, accuracy