How to Measure Pupillary Distance (PD) | Eyebuydirect
How to Measure Pupillary Distance (PD) | Eyebuydirect
Jan 3, 2018
eyebuydirect.com
How PD meter measures flow 1. Fluid enters the inlet. 2. Fluid fills the spaces between gear teeth and casing. 3. Flow forces the gears to rotate. 4. A fixed volume is trapped in each gear cavity. 5. Trapped fluid is carried around the gear perimeter. 6. Tight clearances prevent backflow through the center. 7. Gear teeth re-mesh at the outlet. 8. Trapped fluid is displaced out of the meter. 9. Each gear rotation equals a known volume. 10. Rotations are counted by the sensor. #instrumentation #pr
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