How much cut-off volume is needed for small flow rate of vortex flowmeter?

The size of the small flow cut-off volume of the vortex flowmeter depends on factors such as the installation location and model, and is generally 5-10% of the flow measurement range.

1. The principle of small flow cut-off phenomenon of vortex flowmeter

The vortex flowmeter is a flow measurement instrument widely used in industrial and commercial fields. It measures When the fluid passes through the vortex street in its pipe, the flow rate is measured by the relationship between the rotation speed of the vortex street and the flow rate. However, under small flow conditions, the inertia of the flow affects the rotation of the vortex street, resulting in inaccurate measurement of small flow rates. At this time, the vortex flowmeter will have a cut-off phenomenon, that is, it cannot accurately measure small flow rates.

2. Factors affecting the low flow cut-off amount of the vortex flowmeter

Although the vortex flowmeter has cut-off phenomenon under low flow conditions, the small flow cut-off amount of the vortex flowmeter is not The size can be controlled by some factors. The following are several main factors that affect the removal volume of small flow rates:

1. Flow measurement range: Normally, the removal volume of a vortex flowmeter under low flow conditions is 5% of the flow measurement range - 10%. Therefore, if you need to measure very small flow rates, you can choose a desktop vortex flowmeter or a miniature vortex flowmeter.

2. Fluid properties: The density, viscosity, cohesion and other characteristics of the fluid will also have an impact on the small flow rate cutoff of the vortex flowmeter. Generally speaking, the amount of liquid removed is less than that of gas.

3. Installation position: The installation position also affects the amount of small flow removal. Generally, installing the vortex flowmeter in the upper part of the pipe will reduce the amount of small flow removal than installing it in the lower part.

4. Vortex flowmeter model: Different models of vortex flowmeters have different cutting volumes. Therefore, when choosing a vortex flowmeter, you must choose according to actual needs.

3. Summary

The factors that influence the small flow cut-off volume of a vortex flowmeter are many. Generally, the small flow cut-off volume of a vortex flowmeter is 5% of the flow measurement range. -10%. In practical applications, selecting different models of vortex flowmeters and appropriate installation locations according to specific flow measurement requirements and conditions can greatly reduce the impact of small flow cutoffs.