Page 110
Occlusion Test without Seal
The occlusion test can also be set up to work like this:
1. Connect a product to the test port. The open end of the product is
allowed to flow to atmosphere. Push the START switch or allow the
start to be activated by automated equipment. Information about input
and output connections is on page 88-89.
2. The coupling timer will not be used for this test. (The coupling timer
provides delay time needed to activate the fixture before starting the
test.)
3. At the start of fill time, the pressure decay valve opens and fills the
product with air.
4. IF the part is blocked the test pressure will rise too high during the fill
time, above the pressure error limit, and the test will fail. This is a fast
test for a relatively large change in the flow rate. At the end of fill
time, valves close stopping the flow of air to the product.
5. Stabilization time will not be used in this test. (For large flow rates
stabilization time would allow the pressure to flow out before
pressure drop readings can be taken in the test time.) Sprint LC goes
into test phase only if test pressure is within the pressure error
tolerance by the end of the fill phase. (Again, no stabilize time is
needed for large flow rates.)
6. During test time, 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 up. 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. Note: If the fill
time check is sufficient for your needs, the test time may be set to 0.1
second and a small decay value entered to allow this portion of the
test to always pass.
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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