General Guidelines for Liquid Flow Meter Selection

Time: 2024-07-16
Equipment Configuration:liquid flow meters

In order to correctly select the flowmeter, first of all, each type of flowmeter must have a basic understanding of the measurement principle, structure, performance, etc., and then combined with the specific measurement conditions, taking into account the accuracy of the measurement, economy and other factors, to determine the type of flowmeter and specifications.

Project Overview

General guidelines for selecting a flow meter

  • (1)Determine the characteristics of the measured fluid. Clearly measured fluid is what kind of media, that is, to understand the measured fluid is liquid, gas or steam; measured fluid properties, such as flow rate, density, viscosity, corrosivity and compression, etc.; measured medium temperature, pressure, and its high and low changes in the normal operation range; measured fluid flow range, including the minimum flow rate, the common flow rate, the maximum flow rate; fluid flow state is laminar or turbulent; whether or not there is pulsation; As well as whether the fluid flow is in a full pipe state, these factors will directly affect the selection of the flowmeter.
  • (2)Define the technical requirements for flow measurement. Define the accuracy of the flow meter, that is, to determine the accuracy of the measured fluid requirements; flow measurement of repeatability, that is, under certain conditions, many times repeatedly measure the same amount of the measured value is the same; flow measurement results of the representation, is the mass flow or volume flow, is the instantaneous flow or cumulative flow; flow meter signal output, whether it is necessary to have a remote transmission function; flow measurement Flow measurement results of the display mode, whether mechanical or electronic meter head, etc.. If the flow meter does not match the technical requirements of the measured fluid, it will also lead to measurement errors.
  • (3)Determine the installation conditions of the flow meter. Flow meter measurement object is generally based on pipeline liquids, so the flow meter is generally installed in the pipeline for measurement, then before selecting the flow meter, it is necessary to understand the site conditions, to determine whether or not the need for explosion-proof type of flow meter; instrumentation installation, whether outside the pipeline or in the closed pipeline, whether or not the need to break the pipe; if the break pipe, the process pipeline vibration as well as the ambient temperature and humidity conditions, etc. To choose the flow meter with small permanent pressure loss and easy installation and maintenance.
  • (4)Determine the economy of operation. Flowmeter structure of different prices and pressure losses are different, comprehensive consideration, the price belongs to the one-time investment, but if the pressure loss is not properly selected, then the flowmeter will make the long-term operation of the fluid flow kinetic energy loss is huge, resulting in a waste of energy. In short, the choice of liquid flowmeter to consider the above factors, in order to achieve both to meet the technical requirements and economic and reasonable.

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The magnetic inductive flowmeter industry, these are successful cases with comparable and reference value.

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