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Flowmeter selection principle introduction

In the past 30 years, with the rapid development of the international economy and science and technology, flow meters have received increasing attention. In order to meet the characteristics of different types of fluids and solve the problem of flow metering under different flow conditions, there are dozens of types of flowmeters developed and put into use in various countries, and hundreds of models of domestic and foreign flowmeters are listed.

The industrial production industry and the boiler industry are paying more and more attention to energy conservation and environmental protection. The accurate measurement of water, oil, gas and steam in the production process is also becoming more and more important. The measurement of medium flow in industrial production is influenced by many factors such as its state, type, temperature, flow rate, flow rate, pressure, etc., which determines the complexity of flow metering. Therefore, the selection of the flowmeter is highly technical and practical.

Flowmeter selection principle

1, the choice of flowmeter

At present, the development of flowmeter measurement technology has matured, but it has a wide variety. Up to now, there is no flowmeter that can be applied to any occasion, and each flowmeter has a range of application and has limitations.

Due to the complexity and importance of the process and the object being measured in industrial production, the importance of the selection of the field flow meter is determined. Therefore, the correct and effective selection of the flowmeter must be familiar with the various processes in the industrial production process and the characteristics of the fluid being measured and the measurement methods to be used, as well as other relevant influencing factors, such as flowmeter performance indicators (flow range, Factors such as ultimate pressure resistance, error and repeatability, price, use requirements, installation environment and maintenance processability, and then specific analysis, overall planning, careful design and reasonable selection according to specific conditions.

2, the specific selection principle of the flowmeter

Flowmeter selection refers to the selection of five aspects according to the type of fluid and instrument performance, fluid characteristics, installation conditions, environmental conditions and economic factors according to industrial production requirements.

Instrument performance - quality, stability, accuracy, range, linearity, signal parameters, response time, pressure loss and other factors.

Fluid properties—temperature, pressure, density, viscosity, clogging, phase change, erosiveness, electrical conductivity, speed of sound, thermal conductivity, etc.

Installation conditions - pipe layout direction, flow direction, length of straight pipe section on the upstream and downstream side of the test piece, pipe diameter, maintenance space, vibration, power supply and other conditions.

Environmental conditions - ambient temperature, humidity, electromagnetic interference, safety, explosion-proof lightning protection, pipeline vibration and other conditions.

Economic factors - procurement costs, installation fees, calibration fees, maintenance costs, service life, spare parts and other factors.

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