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1. Volumetric flowmeter?
Positive displacement flowmeter, also known as PD flowmeter or PDF, is the most accurate type of flow meter. It uses mechanical measuring elements to continuously divide the fluid into individual known volume parts, and measures the total flow volume based on the number of times the measuring chamber sequentially and repeatedly fills and discharges that volume part of the fluid. His representatives include gears, scrapers, and rotary pistons. The internal design of a positive displacement flowmeter includes a space that constitutes a certain volume. The internal rotation of the flowmeter rotates under the pressure of the fluid flowing in from the inlet. With the rotation of the rotor, the fluid flows from the inlet to the outlet. At this time, during the rotation process, a certain volume space is formed between the rotor and the flowmeter housing, filling this space with fluid. With the rotation of the rotor, the fluid is continuously sent to the outlet. If the volume of the space is designed and the number of rotations of the rotor is measured, the volume given by the space can be obtained, thereby obtaining the volume of fluid flowing through it. In addition, based on the number of rotations of the rotor measured per unit time, the instantaneous flow rate can be obtained, which is the measurement principle of the volumetric flowmeter. PDF has high measurement accuracy, with a basic error of generally ± 0.5% R, and special ones can reach ± 0.2% R or higher. Usually used in expensive media or situations that require accurate measurement. PDF does not affect the accuracy of measurement when there is distortion in the velocity field of rotating flow and pipeline obstruction components,
2. The meaning of positive displacement flow meter
Positive displacement flow meter, also known as PD flow meter or PDF, is the most accurate type of flow meter.
. It uses mechanical measuring elements to continuously divide the fluid into individual known volume parts, and measures the total flow volume based on the number of times the measuring chamber sequentially and repeatedly fills and discharges that volume part of the fluid. His representatives include gears, scrapers, and rotary pistons. The internal design of a positive displacement flowmeter includes a space that constitutes a certain volume. The internal rotation of the flowmeter rotates under the pressure of the fluid flowing in from the inlet. With the rotation of the rotor, the fluid flows from the inlet to the outlet. At this time, during the rotation process, a certain volume space is formed between the rotor and the flo
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