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Dual Phase Rate Compensation Chart
7
Phase Ratio (% Inspiration)
Typical plot of actual stroke rate at various ratios and strokes.
Figure 4. Dual Phase Rate Compensation Chart
Note: Actual I/E ration range is 25/75 to 50/50.
The graph above, taken from tests on a Harvard Model 613 Ventilator, is typical of the
performance expected from a dual phase motor control pump. As observed, actual
stroke rate varies considerably as the phase ratio reaches its outer limits. Users should
be aware of this relationship and develop appropriate curves to assure experimental
data.
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