Working principle of turbine flowmeter

Turbine flowmeter is a speed instrument with high precision, good repeatability, simple structure, high pressure resistance, wide measurement range, small size, light weight, small pressure loss, long life, simple operation, convenient maintenance, and no zero point With the advantages of drift and high turndown ratio, it is used to measure the volume flow and accumulation of low-viscosity, non-corrosive, and clean liquids in closed pipelines. The main structure of the turbine flowmeter: it consists of a turbine and an external pulse detector. The liquid flows into the turbine to cause the rotor to rotate. The specific inner diameter makes the rotor speed directly proportional to the flow. The pulse detector converts the detected rotor blade rotation into a pulse signal proportional to the flow rate. The specific variable is the K factor (number of pulses/liter), each sensor has been calibrated to determine the K factor and marked on the label, and a calibration report can also be provided if the customer requires it. Working principle: Turbine flowmeter is the main type of velocity flowmeter. When the measured fluid flows through the sensor of the turbine flowmeter, under the action of the fluid, the impeller is forced to rotate, and its speed is proportional to the average flow velocity of the pipeline. At the same time, The blade periodically cuts the magnetic field lines generated by the electromagnet and changes the magnetic flux of the coil. According to the principle of electromagnetic induction, a pulsating potential signal, that is, an electric pulse signal, will be induced in the coil. The frequency of this electric pulsation signal is proportional to the flow rate of the measured fluid. Proportional. The liquid turbine flowmeter has high-quality bearings and specially designed guide vanes, so the wear is greatly reduced, it is not sensitive to peaks, and it can give reliable measurement variables even under harsh conditions. The output signal of the turbine flowmeter is pulse, which is easy to digitize. The pressure loss of the turbine flowmeter is small, the blade can be anti-corrosion, and can measure viscous and corrosive media. If the turbine flowmeter is matched with a secondary instrument with special functions, it can also perform quantitative control and over-quantity alarm.

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