Aister Share What is a suitable and affordable vortex flowmeter
2021-06-21
The type of vortex flowmeter used should be based on the chemical and physical properties of the measured medium, and the tube diameter, total flow range, lining raw materials, metal electrodes and output current of the vortex flowmeter should be selected according to the material characteristics of the measured medium.
1.precision problem selection
Precision level, for the instrument panel, the higher the precision level, the higher the price will be, and the appropriate selection can ensure economic development and cost-effective. For example, places used for foreign trade transactions, commodity work handover and power energy measurement verification should be selected with higher accuracy levels, such as 1.0, 0.5, or more advanced; Places used for process management, different precision levels are selected according to control regulations; Some just check the total flow of the whole process, without control and metrology verification, can select a slightly lower accuracy level, such as 1.5, 2.5, and even 4.0, at this time can use high-quality and inexpensive insertion vortex flowmeters.
2. Substances that can be accurately measured
Each specification of vortex flowmeter has a total flow range limit in itself, and the specifications of the instrument panel are as consistent as possible with the pipeline. The selection of instrument panel specifications (specifications) is not necessarily the same as the processing process pipeline, it should be determined whether the precise measurement of the total flow scope is clear in the water flow scope, that is, when the pipeline water flow is slightly lower, the instrument can not be considered when the instrument is specified, or the precise measurement accuracy under the water flow can not be ensured here, the instrument panel specifications must be reduced, and then the water flow in the pipe can be increased. Satisfactory and accurate measurement results are obtained.
3. Selection of vortex street liquid level transmitter
In the precise measurement of saturated water vapor, the VA type piezoresistance vortex level transmitter is selected, because the vortex flow meter has a wide measuring range, so in the specific application, it is generally key to consider that the total flow rate of accurate measurement of saturated water vapor can not be less than the lower limit of the vortex flow meter, in other words, it is necessary to consider that the liquid water flow can not be less than 5m/s. According to the size of the amount of steam used, the vortex level transmitter of different specifications can be used, and the intelligent transmitter specifications can not be selected based on the current processing process pipeline specifications.
4. Selection of working pressure compensation temperature transmitter
Because the saturated water vapor pipeline is long and the working pressure fluctuates greatly, it is necessary to select the working pressure compensation, fully consider the corresponding relationship between the working pressure, temperature and relative density, and only select the working pressure compensation in the accurate measurement, because the saturated vapor pressure of the pipeline is in the range of 0.3-0.7MP a, and the measurement range of the temperature transmitter can be selected 1MP a.
5. Digital display instrument selection
Digital display instrument intelligent total flow display instrument, with pressure regulator compensation, instantaneous speed total flow display information and accumulation of total flow. This item and the fourth item above, in fact, many of them are combined, and immediately buy the temperature and pressure compensation integral, which is more convenient.
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