How to Measure Pupillary Distance (PD) | Eyebuydirect
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How to Measure Pupillary Distance (PD) | Eyebuydirect
Learning how to measure your pupillary distance at home is an important step towards finding your next pair of glasses. Try our free average pupillary distance ruler.
Jan 3, 2018
PD Measurement Tutorial
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
0:07
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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