Uson SPRINT LC, Owner'S Manual

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Page 50
Reject Levels
Pressure Decay Test
The pressure decay test reject level is the amount of decay from the initial
test pressure the product
must maintain to be accepted as good. If the
pressure decays more than the established reject level before the end of
test time, the fail light turns on and LEAK is displayed in the status box.
Vacuum Test
The reject limit in a vacuum test is set in the same way as a positive
pressure test. Enter the amount of vacuum the product must maintain to be
accepted as good (the amount of vacuum loss). If the vacuum loss is more
than the reject level, the fail light turns on and LEAK is displayed in the
status box.
Occlusion (Blockage) Test
An occlusion test looks for a pressure drop, but the accept/reject settings
are opposite of a pressure decay test. In an occlusion test, the pressure
must drop MORE than the reject value to create a pass condition. If the
test pressure is 40 psig, for example, then a typical reject level might be a
value such as 20 psig. The product under test must vent (or loose) more
than 20 psig within the allocated time to pass. Testers that have mass flow
sensors do not offer occlusion testing because they can read flow directly
with a mass flow sensor instead.
Product Volume and Flow Rate
To have Sprint LC calculate the leak rate in cubic centimeters per minute,
it is only necessary to enter the internal volume of the product to be tested.
During a test, Sprint LC measures the pressure drop, and calculates the
leak rate in units of cubic centimeters per minute. To turn off the
conversion and display pressure decay set the volume to zero.