Liquid turbine flowmeter viscosity requirements for liquid media

What are the requirements for the viscosity of the liquid turbine flowmeter? Most customers do not know much about the viscosity requirements of the liquid turbine flowmeter. In fact, many customers do not know that there are certain conditions for the viscosity of the liquid medium. The following is an introduction by the technical consultant about the viscosity requirements of the liquid turbine flowmeter for the liquid medium. The liquid turbine flowmeter 

is a viscosity-sensitive flowmeter. When the viscosity of the liquid increases, the linear area of ​​the instrument coefficient becomes narrower, the lower limit flow increases, and when the viscosity increases to a certain value, there is even no linear area. The situation of spiral blades is much better than that of straight blades.

For liquids, water is usually used to calibrate the sensor. When the accuracy is 0.5, the liquid below 5×10-6mm2/s can be calibrated without considering the influence of viscosity. When the viscosity of the fluid is higher than 5 times;10-6mm2/s, it can be calibrated with a liquid of equivalent viscosity without making viscosity corrections. In addition, some measures can also be taken to compensate for the influence of viscosity. Such as narrowing the range of use, increasing the flow rate downline value or multiplying the instrument coefficient by the Reynolds number correction factor. 

The influence of viscosity on the instrument coefficient is related to the sensor structure type and parameter caliber size. There are several ways to express the effect of viscosity on instrument factor: the relationship between instrument factor and Reynolds number, the relationship between instrument factor and output frequency at several viscosities, and the relationship between instrument factor and the ratio of output frequency divided by the moving year, etc. Some manufacturers prepare these data, but not all manufacturers have them.