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Reference
5.0.5 Converting Pressure to Flow Rate
You can determine the leak rate in flow units (cubic
centimeters per minute) based on the pressures (P1 less P2)
measured by Sprint iQ. In a pressure decay test, Sprint iQ
holds the pressure drop on the main digital readout-large
numerals in the center of the LCD. The pressure drop is the
delta pressure (P) in the formula.
Delta time (t) is the test timer value set in Sprint iQ’s pressure
decay program (provided the test passes). Because this timer
is set in seconds, merely divide by 60 to get the delta time in
minutes.
Volume is the part volume plus Sprint iQ’s internal test circuit
(generally between 5.0 cubic centimeters and 15.0 cubic
centimeters depending on model) plus the volume of
connections between Sprint iQ’s test port and the product.
The total volume (for our example) must be in cubic
centimeters.
Atmosphere is the barometric pressure in pounds per square
inch (roughly 14.7 psi at sea level). This number changes with
weather conditions.
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