Theory Of Operation; Theory Of Alps Leak Testing - Alps Electric SC Linear Leak Tester Quick Start Manual

AIR LOGIC POWER SYSTEMS (ALPS)

THEORY of OPERATION

Theory of Operation

Theory of ALPS Leak Testing

Start of Leak Test
When a container is detected by the SC test photo eye the probe extend and fill valves will execute simultaneously. At
this time pressurization of the container occurs. During this process the container is electronically monitored to insure
the sealed container reaches the specified Peak Pressure. If the container fails to reach peak pressure the container
will be rejected for a fill failure. A fill failure usually occurs if there is a large hole or defect in the container. If the
container reaches target pressure then the SC performs Test 1.
Leak Testing on the SC
Depending upon the application and possible time constraints required T1 maybe be used for the entire leak test or for
a stabilization period. These types of scenarios are discussed in greater detail in the advanced operator manual.
TEST 1 (T1)-(Stabilize Test)
As stated Test 1 on a SC machine can be used for the entire leak test or it can be used as pressure stabilization period. If
T1 is used for stabilization, this is the time allowed for the pressure curve to flatten out. Test 1 will reject the container if
Maximum % percent value is exceeded. If Maximum % value is not exceeded test 2 is performed.
Test 2 (T2)-(Leak Test)
Unlike test 1, test 2 is normally performed over a longer period time. This is done so that smaller leaks can be
detected. The graph below shows how time is relative to pressure loss in both good and bad containers. Notice the
pressure loss is more uniform or steady in T2 in relation to T1. In T2 the container will be rejected if the maximum %
percent value is exceeded. If the T2 maximum % is not exceeded the container is considered good. At the end of the
test cycle the test probe is lifted and a probe retract timer begins. At the end of this time period, the probe is
considered to be retracted and the test cycle is completed.
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ALPS SC LINEAR QUICK-START GUIDE REV00 © 02/12/2014