Precautions for flow meters

Fluid characteristics mainly refer to the pressure, temperature, density, viscosity, compressibility, etc. of gas. As the volume of gas changes with temperature and pressure, compensation and correction should be considered.
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Instrument performance refers to the accuracy, repeatability, linearity, range ratio, pressure loss, initial flow rate, output signal, and response time of an instrument. When selecting a flow meter, the above indicators should be carefully analyzed and compared, and an instrument that can meet the requirements of measuring medium flow rate should be selected.
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Installation conditions refer to the flow direction of gas, pipeline direction, length of upstream and downstream straight pipes, pipe diameter, spatial position, and fittings, all of which can affect the accurate operation, maintenance, and service life of gas flow meters.
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Economic factors refer to procurement costs, installation costs, maintenance costs, calibration costs, and spare parts, which are also affected by the performance, reliability, and lifespan of gas flow meters.
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The accuracy level and function of the instrument are selected based on measurement requirements and usage scenarios to achieve economic benefits. For example, in situations such as trade settlement, product handover, and energy measurement,
In the selection of accuracy levels, such as 1.0, 0.5, or higher, for process control applications, different accuracy levels should be selected according to control requirements. In some cases where only the process flow rate is detected without the need for precise control and measurement, slightly lower accuracy levels such as 1.5, 2.5, or even 4.0 can be selected. In this case, low-cost plug-in electromagnetic flow meters can be used to measure medium flow rate, instrument range, and diameter. When measuring medium with general medium, the full flow rate of the electromagnetic flow meter can be selected within a relatively wide range of measuring medium flow rate of 0.5-12m/s. The selection of instrument specifications (caliber) may not necessarily be the same as the process pipeline. It should be determined based on whether the measured flow rate range is within the flow rate range. That is, when the flow rate of the pipeline is too low to meet the requirements of the flow instrument or the measurement accuracy cannot be guaranteed at this flow rate, it is necessary to reduce the instrument diameter to increase the flow rate inside the pipeline and obtain satisfactory measurement results.