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What type of flow meter is suitable for measuring diesel or other oily fluids? For diesel with moderate viscosity, we recommend the commonly used vortex flow meters and turbine flow meters, which offer good cost-performance ratios. For some oils with relatively high viscosity, such as engine oil. So, can vortex flow meters and turbine flow meters be used? The answer is definitely no. Speaking of which, why do vortex flowmeters have such advantages when used for measuring diesel? Here we need to analyze the characteristics of vortex flowmeters; it is by examining these characteristics that one can understand the advantages of vortex flowmeters and why they are recommended for measuring diesel. The principle of the vortex flow meter is based on the Karman vortex street phenomenon; structurally, it consists of a vortex generator inside the pipeline, and as the fluid passes through this vortex generator, Karman vortices are formed, and the sensor is used to determine the instantaneous frequency of the fluid. Vortex flowmeters are relatively cheaper than other types of flowmeters. Vortex flowmeters also have some notable characteristics in terms of their operation: 1. The volumetric flow rate is not affected by thermal properties such as the temperature, pressure, density, or viscosity of the fluid being measured. 2. No moving parts; the measuring element has a simple structure, reliable performance, and a long service life. 3. It offers high accuracy with a repeatability of 0.5%, and requires minimal maintenance. 4. It can measure the flow rate of liquids, gases, or vapors. 5. Generally, no separate calibration is required. 6. It has a wide measurement range. The range ratio can generally reach 1:10^7, resulting in low pressure loss