Reasons for the decrease in the accuracy of the turbine flowmeter
1. There are generally some impurities in the medium, which will cause wear on the bearings and shafts, so that the gap between the two will increase, the dynamic balance of the moving parts will be destroyed, the rotational speed will drop, or the dirt will enter the gap, so that the motion resistance will increase. The speed drops. For these reasons, the display value of the meter is reduced, and a negative error occurs, which is unfavorable to the supplier of the fluid.
2. The fibrous or viscous impurities in the fluid are attached to the rotating part of the flowmeter, which increases the rotational resistance, resulting in a decrease in the indication value of the meter and a negative error, which is unfavorable to the supply side of the fluid.
3. The change of fluid temperature and pressure may cause the liquid in the pipeline to escape the air contained in the pipeline or because the pressure inside the pipeline is lower than the saturated vapor pressure of the fluid, causing some of the liquid to become steam, or may be caused by the negative pressure of the medium. The gas is sucked into the pipeline, and these gases flow with the liquid to be measured, causing the meter to increase in value and a positive error, which is unfavorable to the demand of the fluid.
4, the working environment is relatively harsh, for example, electromagnetic field interference, dust, high temperature, vibration, humidity, etc., may cause the turbine flow sensor malfunction or malfunction, directly cause the turbine flow meter indication error, the error is positive or negative The value may not be obvious or it may be completely invalid. For the above phenomenon, when it is more serious, problems can be found from the comparison of the working state of the process, and it is easy to take corresponding measures. However, in the early stages of the problem, problems cannot be discovered without special measures.
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