What are the advantages of the vortex flowmeter? Flow meter imported brand
The rapid development of young vortex flowmeters and the wide range of applications are beyond the reach of many flow meters. The reason is determined by its own characteristics. The main features of the vortex flowmeter are as follows:
There are many instruments that output analog signals, such as differential pressure flowmeters, float flowmeters, electromagnetic flowmeters, and target flowmeters. There is a zero drift of the output signal of this kind of instrument, which will bring errors to the flow measurement, especially in the small flow state, the influence of zero drift on the measurement accuracy is not negligible. Among the above several types of flow meters, except for the electromagnetic flowmeter, the flow characteristics of other flow meters are still non-linear. The problem that this kind of nonlinearity brings to the instrument is that when the range is low, the measurement accuracy and the detection sensitivity are difficult to increase, and the range ratio of the meter is difficult to expand.
In the flow meter, the moving measuring part is undoubtedly its weak link. The wear of the moving parts changes the meter factor, which not only reduces the measurement accuracy, but also shortens the life of the meter. In order to maintain measurement accuracy during the lifetime, the meter must be calibrated frequently. The short calibration period is another disadvantage of having a movable component flow meter. The cleanliness requirements of the tested media are high, and the scope of application of the instrument is limited. The vortex flowmeter has no moving parts, which improves its reliability.
Within a certain Reynolds number range, the frequency of vortex separation is only proportional to the volumetric flow in the fluid mode. It is not sensitive to changes in pressure, temperature, viscosity and composition of the fluid being tested. Therefore, under geometrically similar and dynamic similar conditions, a vortex flowmeter can be calibrated with a typical medium (such as water or air) to determine its meter factor and can be used in other media. This feature of the vortex flowmeter provides great convenience to both the manufacturer and the user. For vortex flowmeters for high-pressure gas, using the meter factor calibrated under normal pressure conditions, users can rest assured that the production plant does not have to worry about not having high-voltage calibration equipment; vortex flowmeters for gas can also be used in water. Calibration in the flow standard device to improve calibration accuracy. This feature of vortex flowmeter provides favorable conditions for it to achieve dry calibration and body standardization.
Most vortex flowmeters have a good linearity in the range of Reynolds number ZxlW-TxK^. According to this Reynolds number range, the maximum range ratio of vortex flowmeter can reach more than 300:1. It is very difficult to achieve such a high turndown ratio due to the sensitivity of the detecting element, the pressure loss of the meter, and other limitations. However, most vortex flowmeters have a turndown ratio of 10:1 or more, and some can reach 20:1 or even 30:1. Other flowmeters, such as differential pressure flowmeters, do not have such a wide range of ranges.
The vortex flowmeter is a flowmeter with a medium-accuracy measurement accuracy. The accuracy of the measured liquid is usually ±0.5% ~ ±1%, and the accuracy of the measured gas is ±1%~±1.5%. This precision is better than the turbine. The flowmeter and the Coriolis mass flowmeter are low, but the measurement accuracy is higher than that of the conventional differential pressure flowmeter and the floatation flowmeter.
The structure is simple and easy to install.
Applicable inch > medium
Vortex flow meters measure the flow of liquids, gases and vapors. Many flow meters do not have this feature. For example, electromagnetic flowmeters can only be used for conductive liquids, and can not be measured for chemical media, oils and gases with low conductivity; volumetric flowmeters can measure liquids and gases, but cannot measure steam.
Compared with the orifice flowmeter, the vortex flowmeter has a small pressure loss, only 1/4-1/2 of the orifice plate.
In addition to individual types (such as vibrating body type), it can be installed horizontally, vertically, and at different angles depending on the process piping in the field. Turbine flow meters and volumetric flow meters cannot be so flexible.
When measuring the flow of small and medium pipes, a full-tube vortex flowmeter can be selected; when measuring the flow of large-diameter pipes, a plug-in vortex flowmeter can be selected.
The advantages of the above 1~4 are the most favorable for the dry calibration of the vortex flowmeter.
condition
Among all flowmeters, vortex flowmeters can use the most detection technology. Thermal, force sensitive, ultrasonic, photoelectric, magnetoelectric and other detection technologies are almost always used, so that the advantages of different detection technologies can be fully utilized. Different testing techniques are available for different fluids, different operating conditions, and different measurement requirements, which is not comparable to other types of flow meters.
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