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1. Structural features and working principle
(1) Structural features
The sensor is of the thrust type with cemented carbide bearings, which not only ensures accuracy and improves wear resistance, but also has the characteristics of simple structure, firmness, and convenient disassembly and assembly.
(2) Working principle
When the fluid flows through the sensor housing, since the blades of the impeller have a certain angle with the flow direction, the
impact force of the fluid gives the blades a rotational torque. After overcoming the frictional torque and fluid resistance, the blades rotate. After the torque is balanced, the rotation speed becomes stable. Under certain conditions, the rotation speed is proportional to the flow velocity. Since the blades are magnetic, they are in the magnetic field of the signal detector (composed of a permanent magnet and a coil). The rotating blades cut the magnetic lines of force, periodically changing the magnetic flux of the coil, thereby inducing electrical pulse signals at both ends of the coil. This signal is amplified and shaped by an amplifier to form a continuous rectangular pulse wave with a certain amplitude, which can be transmitted remotely to the display instrument to show the instantaneous flow or total flow of the fluid. Within a certain flow range, the pulse frequency f is proportional to the instantaneous flow Q of the fluid flowing through the sensor. The flow equation is:
In the formula:
f - Pulse frequency [Hz]
k - Instrument coefficient of the sensor [1/m3], given by the calibration sheet.
Q - Instantaneous flow of the fluid (under working conditions) [m3/h]
3600 - Conversion coefficient between seconds and hours
The instrument coefficient of each sensor is filled in the verification certificate by the manufacturer. After setting the k value in the supporting display instrument, the instantaneous flow and cumulative total can be displayed.
2. Basic parameters and technical performance
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