Flowmeter Should Be Noted

1. Fluid characteristics mainly refer to gas pressure, temperature, density, viscosity, compressibility, etc., because the volume of gas changes with temperature and pressure, should consider whether to compensate.
2. Instrument performance refers to the instrument's accuracy, repeatability, linearity, range ratio, pressure loss, initial flow rate, output signal and response time, etc., the flow timing should be carefully analyzed and compared with the above indicators, and the instrument that can meet the requirements of measuring medium flow rate should be selected.
3. Installation conditions refer to the gas flow direction, pipeline direction, upstream and downstream straight pipeline length, pipe diameter, spatial position and pipe fittings, which will affect the accurate operation, maintenance and service life of the gas flowmeter.
4. Economic factors refer to the purchase cost, installation cost, maintenance cost, calibration cost and spare parts, etc., which are also affected by the performance, reliability and life of gas and gas flowmeters.
5. Precision level and function According to the measurement requirements and use occasions to select the instrument precision level, so as to be economical. For example, for trade settlement, product handover and energy metering,
In the accuracy level selection, such as 1.0, 0.5, or higher, for process control occasions, select different accuracy levels according to control requirements. Some are just to detect the process flow, do not need to do accurate control and measurement occasions, you can choose a slightly lower accuracy level, such as 1.5, 2.5, or even 4.0, then you can choose a low-cost plug-in electromagnetic flowmeter to measure the flow rate of the medium, instrument range and diameter measurement of the general medium, The full degree flow of the electromagnetic flowmeter can be used in the range of 0.5-12m /s to measure the velocity of the medium. The selection of instrument specifications (caliber) is not the same as the process pipeline, it should be determined whether the measured flow range is within the flow rate range, that is, when the pipeline flow rate is low and cannot meet the requirements of the flow meter or when the measurement accuracy cannot be guaranteed at this flow rate, it is necessary to reduce the diameter of the instrument, so as to improve the flow rate in the tube and obtain satisfactory measurement results.