The reasons for the obvious difference between the displayed value of the turbine flowmeter and the empirical value

This can happen for a number of reasons. The first thing to consider is the influence of the medium on the turbine flowmeter. Temperature changes will cause changes in the viscosity of some measurement media, and the greater the change, the greater the error; the reverse flow of the medium occurs in the measurement pipeline without a check valve, causing measurement errors; the downstream of the measurement pipeline is directly emptied, resulting in Insufficient back pressure leads to cavitation, which affects the rotation of the impeller and also causes errors; due to inaccurate calculations during model selection, the turbine flowmeter is used beyond the range, making the turbine flowmeter work in an area with low linearity, resulting in a large error. The turbine flowmeter itself will also have some reasons that affect the accuracy. For example: the magnetism of the magnetic material in the detection element is weakened or invalid, which makes the flowmeter work intermittently and seriously affects the accuracy; the circuit of the display head will also fail; the deformation of mechanical parts such as the impeller and the wear of the bearing will make the turbine flowmeter The instrument coefficient changes, which affects the accuracy. Therefore, for the turbine flowmeter, to ensure the accuracy of measurement, it is necessary to calibrate the flowmeter regularly and modify the instrument coefficient that has changed, which is also the biggest shortcoming of the turbine flowmeter in use.

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