The liquid turbine flowmeter uses a turbine for measurement. It first converts the flow rate to the speed of the turbine, and then converts the speed into an electrical signal proportional to the flow. This kind of flowmeter is used to detect the instantaneous flow and the total integrated flow. Its output signal is frequency, which is easy to digitize. The induction coil and the magnet are fixed on the housing together. When the ferromagnetic turbine blade passes the magnet, the magnetic resistance of the magnetic circuit changes, thereby generating an induction signal. The signal is amplified and shaped by the amplifier and sent to a counter or frequency meter to display the total integrated flow. At the same time, the pulse frequency undergoes frequency-voltage conversion to indicate the instantaneous flow. The speed of the impeller is proportional to the flow rate, and the number of revolutions of the impeller is proportional to the total amount of flow.

 

The output of the turbine flowmeter is a frequency modulated signal, which not only improves the anti-interference of the detection circuit, but also simplifies the flow detection system. Its range ratio can reach 10:1, and the accuracy is within ±0.2%. The time constant of the turbine flowmeter with small inertia and small size can reach 0.01 seconds.

 

Liquid turbine flow meters are widely used in petroleum, organic liquids, inorganic liquids, liquefied gas, natural gas and cryogenic fluids.

The output signal of the turbine flowmeter is pulse, which is easy to digitize. Turbine flowmeter has small pressure loss, blades can be anticorrosive, and can measure viscous and corrosive liquids.