(1) Advantages of vortex flowmeter Compared with throttling differential pressure flowmeter, vortex flowmeter has the following advantages. Wiper Arm,Autozone Wiper Blades,Rear Windshield Wiper,Wiper Blades For My Car Ruian Wanjiang Auto Parts Co.,Ltd , https://www.wanjiangautoparts.com
1 The structure is simple, firm, easy to install and maintain. There is no need for pressure guiding pipes and three-valve manifolds to reduce leakage, blockage and freezing.
2 The accuracy is high, generally ± (1 ~ 1.5)% R.
3 Wide measuring range, reasonable determination of caliber, range up to 20:1.
4 The pressure loss is small, about 1/4 to 1/2 of the throttling differential pressure flowmeter.
5 Output pulse signal proportional to flow without zero drift.
6 Within a certain range of Reynolds number, the output frequency is not affected by the physical properties (density, viscosity) and composition of the fluid, that is, the meter factor is only related to the shape and size of the vortex generating body and the pipeline.
(2) Limitations of vortex flowmeter 1 It is sensitive to mechanical vibration of pipelines and should not be used for strong vibration.
2 The larger the caliber, the lower the resolution. In general, the flowmeter is used for DN400 or less.
3 When the fluid temperature is too high, the sensor still has difficulty. Generally, the fluid temperature is ≤ 420°C.
4 When the pressure of the fluid pulsates or the flow pulsates, the indicating value is significantly higher and has a greater influence, so it is not suitable for pulsating flow.
(3)Advantages of throttling differential pressure flowmeter 1 The standard orifice plate structure in throttling differential pressure flowmeter is easy to duplicate, simple and firm, stable and reliable in performance, and low in price. It can be used without real-time calibration, which is rare in flowmeters.
2 Wide range of applications. Not only applies to all single-phase fluids, but also can measure part of the mixed-phase flow, such as gas-solid, vapor-liquid, solid-liquid and so on.
3 high temperature and pressure large diameter and small flow are applicable.
4 It is not sensitive to vibration and has excellent anti-interference ability.
(4) Throttle Differential Pressure Flowmeter Limitations 1 The measurement accuracy is moderate in the flowmeter. Due to the complexity of the influence of many factors, it is difficult to improve the accuracy.
2 The range is narrow. Because the instrument signal (differential pressure) and flow rate are squared, the general range is only 3:1 to 4:1.
3 The on-site installation conditions are relatively high. If a long straight pipe section (finger plate, nozzle) is required, it is generally difficult to satisfy.
4 The pressure-inducing pipeline between the throttling device and the differential pressure display instrument is a weak link, and it is prone to malfunctions such as leakage, blockage and freezing, and signal distortion.
The integrated throttle differential pressure flowmeter developed in recent years, although it still has pressure-inducing lines, is less than 1m in length, thus reducing the defects in this area.
5 Large pressure loss (hole plate, nozzle).
Comparison of advantages and disadvantages of vortex and differential pressure flowmeters