vortex flow flow meter advantages and disadvantages
As a commonly used flow metering instrument, the application of vortex flowmeter plays an important role in industrial production. Intelligent instrumentation, digital LCD display, is closely related to the automation control system. Regarding the advantages and disadvantages of the vortex flowmeter, the following statement is made.
The vortex flowmeter has no moving parts, and the measuring components are simple in layout, reliable in function and long in service life. The volumetric flow rate of the vortex flowmeter is not affected by thermal parameters such as temperature, pressure, density or viscosity of the fluid being measured. It usually does not need to be calibrated on its own. It measures the flow of liquids, gases or vapors. The pressure that it forms is lost. Moreover, the vortex flowmeter has the advantage of high accuracy, the repeatability is 0.5%, and the maintenance amount is small.
But vortex flowmeters also have some disadvantages:
The volume flow rate of the vortex flowmeter is not affected by the thermal parameters such as temperature, pressure and density of the measured fluid, but the final measurement result of the liquid or steam should be the mass flow. For the gas, the measured result should be the standard volume. flow. Both mass flow and normal volume flow must be converted by fluid density, and it is necessary to consider changes in fluid density caused by changes in fluid conditions.
The main factors that form the flow measurement error are: the measurement error caused by the uneven flow velocity; the medium density when the fluid condition is changed cannot be accurately determined; the wet full steam is assumed to be dry and full steam for measurement. If these errors are not constrained or eliminated, the total measurement error of the vortex flowmeter will be large.
The anti-vibration function of the vortex flowmeter is poor. External oscillations can cause errors in the vortex flowmeter measurement and may not even work properly. The high flow velocity shock of the channel fluid will cause additional oscillation of the cantilever episode of the vortex episode, which will reduce the measurement accuracy. The large diameter impact is more significant.
The above is a description of some of the characteristics of the vortex flowmeter, but in any case, the vortex street is widely used and plays a big role in the development of modern industry. As long as the characteristics are mastered, it can be used properly in appropriate occasions. .