Reference 8-53
Coupling Pressure: The air pressure supplied to external fixtures. Coupling
pressure must be greater than the test pressure and the same as the
incoming line pressure unless additional pneumatic components are added.
Coupling Time: A delay timer used to apply a clamp or seal to product under test
before the product is filled with air. Coupling time gives fixtures enough
time to seal product before Qualitek mR applies test pressure.
Coupling Valves: The coupling valves can be programmed to allow automated
testing of parts that have special sealing and/or connection requirements.
An example would be a test part that has multiple ports to be sealed in a
particular order or in different combinations for different tests in a
sequence. This is common for check valves or parts that incorporate a
check valve. A given port may need to be sealed in one test and then open
in another test to verify that the check valve will open in one direction and
close in the other. This may require that more than one coupling valves
activate at the same time and is then one is released in a subsequent test.
Crack Test: A crack test is setup to measure the pressure at which a product, like a
check valve, opens and allow air to flow through. It is used with parts that
do not open quickly enough to cause a drop in the upstream pressure. An
optional downstream sensor is required to measure a device that opens very
slowly. Crack testing differs from burst testing because the product does
not suddenly drop to zero pressure as in a burst test.
Decay Test: A test type which may be either a pressure decay or vacuum decay
test.
Decay: The amount of pressure change a product can sustain during a test period
before going out of an established tolerance. This applies to both pressure
and vacuum decay testing.
Equalize Step: The Equalize step operates the equalize valve which, for a time
determined by the step time, operates the equalization valve which allows
the chambers of the differential transducer to adjust to tare.
Electronic Regulator: An optional device that automatically adjusts the test
pressure to a preset value. Multiple test programs with multiple test
pressures may be linked together if this option is installed. It also provides
a way to avoid having the operator manually adjust the pressure for
different test pressures.
Evacuate Time: The time duration to apply a vacuum to the test product in tests
such as a decay test (vacuum).
Event: The instant pressure drops below the event value during a burst or creep
test. Qualitek mR monitors pressure during a burst test or creep test and
holds the maximum pressure value measured before the event (pressure
drop) occurred.
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