Positive displacement (PD) volumetric flow rate measurement.
Positive displacement flow meters measure volumetric flow rate directly.
There are many different principles of design used for manufacturing positive displacement flow meter, which use different shaped chambers and moving parts to suit the intended application, but principally they are all producing a way of breaking up the flow into countable fixed dimension packets, using dynamic chambers as the flow passes through the PD flow meter.
The dynamic chambers have precise dimensions and therefore it is possible to precisely determine the amount of fluid transferred by each chamber. The number of chambers filled are counted over time, and thus the volumetric flow rate can be determined by multiplying the total number of counts by the volume of the chamber and dividing by the total time.
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Glossary of Sensor Technology technical terms
- BFSG – Bonded Foil Strain Gauge
- Bourdon Tube
- Capacitive Fluid Level Measurement
- Ceramic Pressure Sensors
- Conductive Fluid Level Detection
- Doppler Effect Flow Measurement
- Float Fluid Level Detection
- LVDT – Linear Variable Differential Transformer
- Paddle Wheel Sensor
- Piezoresistive Strain Gauges
- Radar Distance Sensing
- SOI – Silicon on Insulator
- Strain Gauge
- Thin Film
- Transit Time Flow Measurement
- Turbine Rotor Sensor
- Ultrasonic Distance Sensing
- Ultrasonic Flow Velocity Sensors
- Vibrating Tuning Fork Fluid Level Detection
- Vortex Flow Measurement
- Wheatstone Bridge Strain Gauge
