Vent Delay Option
Vent Delay is an optional feature that is associated with a crack test. It is
only available if purchased. In some cases the downstream pressure, or
flow through the part, may not start out at zero. This can be caused by the
test fixture or the part itself. The fixture may cause a small amount of
pressure when it closes to seal on the part. Or the test part itself may
require some minimum pressure before a valve in the part will close.
The vent delay option adds an additional timer before the Test Time. The
upstream pressure ramp is started during the Vent Delay time. The down
stream side is vented to atmosphere and the downstream sensor reading is
ignored. This allows any unwanted pressure or flow to be vented before
the test time starts.
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PROGRAM 3
Test Type Flow
Test Press. 10.000 psig
Press. Error .5 psig
Coupling GoTo
Test Params GoTo
Next Program 0
CRACK TEST
Ramp Start 3.000 psig
Ramp Rate .8 psi/s
Vent Time 1.0 sec
Test Time 5.0 sec
Dump AUTO
Max Crack 6.666 psig
Min Crack 3.333 psig
Crack Event .050 psig
Vent time added
before Test time
FIGURE 102
Appendix 26
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