Introduction of turbine flowmeter

Turbine flowmeters are based on the principle of torque balance and belong to speed flowmeters. The sensor has the characteristics of simple structure, light weight, high precision, good reproducibility, sensitive response, easy installation and maintenance, etc. It is widely used in petroleum, chemical industry, metallurgy, water supply, papermaking and other industries. It is an ideal instrument for flow measurement and energy saving. The sensor is used together with the display instrument, and it is suitable for measuring liquids in closed pipelines that are not corrosive to stainless steel 1Cr18Ni9Ti, 2Cr13, corundum Al2O3, and hard alloys, and have no impurities such as fibers and particles. If it is matched with a display instrument with special functions, it can also perform quantitative control and over-quantity alarm. The explosion-proof type (ExmIIT6) of this product is selected, and it can be used in environments with explosion hazards. The sensor is suitable for media with a viscosity less than 5×10-6m2/s at the working temperature. For liquids with a viscosity greater than 5×10-6m2/s, the sensor must be calibrated with real liquid before use. The fluid flows through the sensor housing. Since the blades of the impeller have a certain angle with the flow direction, the impulsive force of the fluid causes the blades to have a rotational moment. After overcoming the frictional moment and fluid resistance, the blades rotate. After the torque is balanced, the speed is stable. Under certain conditions, The rotation speed is proportional to the flow velocity. Because the blade has magnetic permeability, it is in the magnetic field of the signal detector (composed of a magnetic steel and a coil). The rotating blade cuts the magnetic force line and periodically changes the magnetic flux of the coil. As a result, the electric pulse signal is induced at both ends of the coil, and the signal is amplified and shaped by the amplifier to form a continuous rectangular pulse wave with a certain amplitude, which can be transmitted to the display instrument remotely to display the instantaneous flow or total amount of the fluid.

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