A positive displacement meter is a kind of meter where fluid displaces components in the meter mechanically to measure the flow. It measures the fluid or gas’ volumetric flow rate by dividing the components into fixed and metered volumes.
What are the types of PD meters?
• Oscillating piston- Each piston is operated magnetically or mechanically to fill a cylinder with the fluid. The next step involves fluid discharge. Each stroke addresses fluid’s finite measurement.
• Gear- These gears rely on internal gears that rotate to pass the fluids through them. There are two types- oval and helical. An oval gear, a finite amount of fluid is passed through the meter for each revolution. When the fluid passes through the cylinder, the fluid’s pressure causes the rotors to rotate. Helical gears are in the shape of a helix. When the fluid passes through the meter, it enters the rotor’s compartment, forcing the rotors to rotate.
• Nutating disk- Liquid goes inside a precision-machined compartment containing a disc that nutates. The disc’s position separates the chamber into sections containing an exact volume. Liquid pressure impels the disc to vibrate and a roller cam initiates the nutating disc to cause a whole cycle. This motion is translated into rotary motion by means of a ball and shaft, which is attached to the disc.
• Rotary vane- A rotating impeller having more than two vanes, separating the sections between the two vanes into distinct volumes. Plus, each rotation is calculated.
• Diaphragm- The liquid is drawn into the oscillating diaphragm’s inlet side and then released to the opening. The oscillating diaphragm cycles are added up to determine the flow rate.
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