8-2 Uson 628 Operator’s Manual
The relationship between pressure drop and flow rate is dependent upon the
volume of the test component.
The pressure drop/flowrate relationship is given by:
The Tester has a calibration facility to derive the flowrate from the pressure drop.
This function performs a comp and cal test on a master part (i.e. known leak tight
component. The comp test determines the offset reading due to background
leakage within the system.
The cal test determines the ratio between pressure drop and flowrate units for
given leak master and master part.
The tester uses the comp and cal values to display the flowrate units in the
following way:
Flowrate = Leak master value * (Pressure Drop - Comp) / Cal
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