ANF387 gear flowmeter is a type of volumetric flowmeter. It is a transmitter that measures volume flow with high precision. The gears mesh and rotate as the medium flows. Under the action of the fluid flow, a pressure difference is formed at both ends of the meter inlet and outlet. No power is required. A pair of gears rotate freely. The cavity between the gears is filled with liquid, and the liquid is discharged as it rotates. By measuring the number of gear revolutions, the flow rate of the liquid flowing through the meter can be known.