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Occlusion Test with External Seal
The occlusion test can be set up to work like this:
1. Connect a product to the test port. The open end of the product is
placed in the sealing (clamping) fixture. Push the START switch
or activate the start by automated equipment. Information about
input and output connections is on page 88-89.
2. The coupling timer provides delay time needed to activate the
fixture before starting the test. A coupling valve can be used to
supply air to the fixture and hold the seal until the test ends.
3. At the end of coupling time, the pressure decay valve opens and
fills the product with air. Stabilize phase is entered only if test
pressure is within the pressure error tolerance at the end of the fill
phase.
4. At the end of fill time, valves close trapping air inside the product
including the internal test circuit of Sprint LC. Stabilization time
lets the pressurized product settle before Sprint LC starts taking
pressure drop readings. For large flow rates stabilization time is
not needed and can be set to zero.
5. At the end of stabilization time, Sprint LC starts looking for a drop
in pressure from the stabilized pressure. Sprint LC goes into test
phase only if test pressure is within the pressure error tolerance.
6. During test time, the coupling is released and the test part is
opened to atmosphere. Sprint LC compares the pressure drop to the
reject level. IF the pressure decay (or pressure loss) is greater than
the reject level at the end of test time, the pass indicator lights. The
fail light turns on if the pressure is less than or equal to the reject
level. Pass and Reject lights go out after 30 seconds if another test
is not started. Messages in the status box stay on until the next test.
7. If the dump parameter is set to auto or a time, the dump valve
vents the product to atmosphere. If another test is linked to the
occlusion test, Sprint LC goes to the next linked test in the series as
long as the product passed all tests.
8. At the end of all linked tests, the operator (or automated
machinery) removes the product and Sprint LC is ready to begin
the next test.
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