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Leak Test Using Flow
Sprint LC can be used to check for leaks using flow. When setting up this
kind of test, set the minimum flow rate to zero. The maximum flow setting
is then set to the maximum flow rate to accept. The exact flow rate
depends on the product characteristics and specifications.
When to use a flow leak test
A leak test using flow is often an excellent option when certain conditions
apply. If your product is small and the acceptable leak rate is relatively
high, a leak test using flow can be much faster than a pressure decay test.
This is because a flow test conducted on a small product requires no fill or
stabilization time. Typical leak tolerances used in flow leak testing are
roughly 1.0 sccm for small rigid products, and 5.0 sccm or greater for
larger and more flexible products.
If the acceptable leak rate is relatively small (less than the rates discussed
above) a pressure decay test is probably your best choice for leak testing.
Call Uson to discuss your special testing needs. We specialize in helping
test engineers come up with the very best tests for a wide range of
products.
When setting the maximum flow setpoint, you’ll need to experiment to
find the best setting. The maximum flow setting is typically quite high
above zero to allow for high speed testing—the reason to use a flow leak
test in the first place. If the maximum flow setting is set too close to zero
and the time is kept short, a high number of rejects could occur simply due
to inconsistencies among the products tested. Atmospheric and room
pressure changes could also cause errors if the maximum setpoint is set
too close to zero.
Protect the Flow Sensor
DO NOT run a flow test unless product is attached
to the test port. Without this restriction, the high
flow rate could damage the flow sensor.
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