Positive Displacement Flow Meters
Positive displacement flow meters consist of a set of chambers or compartments that are filled with the fluid. Each time the fluid flows through the meter, the chambers fill to a certain volume. Once the chamber is full, it discharges the fluid...
Overview
Positive displacement flow meters consist of a set of chambers or compartments that are filled with the fluid. Each time the fluid flows through the meter, the chambers fill to a certain volume. Once the chamber is full, it discharges the fluid and is refilled
Working Principle of PD Flow Meters
Positive displacement flow meters consist of a set of chambers or compartments that are filled with the fluid. Each time the fluid flows through the meter, the chambers fill to a certain volume. Once the chamber is full, it discharges the fluid and is refilled again for the next cycle. The key here is that each cycle corresponds to a known volume of fluid. The meter counts the number of these cycles, and based on the volume of each cycle, it calculates the flow rate. This process works well because the measurement is independent of factors like pressure and temperature, which can affect other types of flow meters. For example, in a rotary piston PD meter, a rotor moves within a chamber, displacing a fixed volume of liquid with each rotation. The number of rotor rotations is then used to calculate the total flow of the liquid.
Advantages of Positive Displacement Flow Meters
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