Programming
59
4.1.1.6 Pressure Change Calc. (Leak Rate)
In tests such as Pressure Decay Rate, Sprint iQ calculates the leak
rate from the pressure change over time using values derived from
the following formulae.
Variable Definitions for the Calculations:
Compensation:
Calibration:
Test:
The Comp Value and Cal Value can be seen (and edited) on the
Leak Calibration Menu.
The concept previously known to many as the “comp/cal ratio” is
employed in the Sprint iQ as the Pneumatic Signal/Noise Ratio
(PSN ratio) and is discussed page 60. Like the Comp Value and
Cal Value, the PSN ratio appears on the Leak Calibration Menu.
EndMeasure = Measure at the End of a Step
CalRate = Leak Master Leak Value (user-entered value)
Tare = Measure at the Start of a Step
Comp Value EndMeasure
comp
Tare
comp
(using non-leaking master part)–=
Cal Value EndMeasure
cal
Tare
cal
– Comp (using Leak Master)–=
Leak
EndMeasure
test
Tare
test
– Comp–()
Cal
---------------------------------------------------------------------------------------------------
CalRate×=
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