The liquid turbine flowmeter is a viscosity-sensitive flowmeter. When the fluid viscosity increases, the linear region of the meter coefficient becomes narrower, and the lower limit flow rate increases.
When the viscosity increases to a value, even the wireless region. The situation with spiral blades is much better than with straight blades.
For liquids, the sensor is usually calibrated with water. When the accuracy is 0.5, it can be used at 5 x 10 -6 mm2/s. The following liquid does not have to consider the effect of viscosity.
When the viscosity of the fluid is higher than 5 x 10 -6 mm2/s, it can be verified with a relatively viscous fluid without viscosity correction.
In addition, some measures can also be taken to compensate for the effect of viscosity, such as reducing the range of use, increasing the lower limit of flow, or multiplying the meter coefficient by the Reynolds number correction coefficient.
The influence of viscosity on the meter coefficient is related to the sensor structure type and parameters, caliber size, etc.