7-2 Qualitek mR Owner’s Guide
A simple leak test cycle consists of the following phases:
Fill Phase:
The Fill Phase is when the test component is filled to the required test
pressure.
Stabilize Phase:
During the Stabilize Phase the pressure and temperature in the test
component achieve equilibrium.
Test Phase:
The Test Phase is when the instrument discriminates between a good and a
leaking component. The detected leak must remain within preset limits or
the test will end with either a rejected or salvageable component.
Vent Phase :
During the Vent Phase, the test component is vented to atmosphere.
7.1.3 Test Results: Pass, Fail, and Salvage
The Qualitek mR makes it very easy to determine the test results. The display will
clearly indicate Pass, Fail, or Salvage at the end of the test. Also, the simulated
indicator lights of the Uson double-diamond logo will brighten in color to indicate
the status. Green indicates a Pass result, Red indicates fail (reject), and Amber
indicates a Salvage condition.
A pressure error condition exists if the pressure tolerance is not met during the fill
phase. If the pressure tolerance is exceeded during the stabilize time, then a gross
pressure error is reported.
7.1.4 Program Optimization
Once an initial test has been carried out, the following parameters may need to be
adjusted to achieve optimum performance.
Fill Time
Ideally the fill time should be set so that, for a good component, no pressure
variation occurs during the stabilization phase, generally a small variation is
acceptable. The fill time should be set to a period that is only long enough to
ensure that the test component is filled and holds the correct pressure. If the fill
time is too short, the test pressure displayed during the stabilization phase will
either be lower than the set pressure, or will reduce during the stabilization phase
as the pressure equalizes within the component.
Stabilize Time
The Stabilize time is the time that the instrument allows in order to achieve
pressure and temperature equilibrium in the test component before a reliable leak
test can be performed. Generally, increase the Stabilize time to reduce the leakrate
measurement or improve the repeatability of measurement. If the Stabilize time is
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