The flow of fluid through the sensor housing, the impeller blade and the flow direction of a certain angle, the momentum of the fluid so that the blade has a rotating torque to overcome the friction torque and fluid resistance after the blade rotation in the torque balance after the stability of speed under certain conditions, The speed of rotation is proportional to the flow rate. Since the blades are magnetically permeable, they are in the magnetic field of the signal detector (consisting of permanent magnets and coils). The rotating blades cut the magnetic fluxes and periodically change the magnetic flux of the coils, The induction pulse signal, amplified by the amplifier shaping, forming a certain amplitude of the continuous rectangular pulse wave can be far to the display instrument, showing the fluid flow and the cumulative amount of instantaneous.
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