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Technical Information
Figure 89 Selective Ion Pump Detector
Methods of Leak Testing
There are many different ways to leak test parts using helium as a tracer gas. In
general, the leak detection method is selected based on the actual working
conditions of the part being tested. It is recommended that during leak testing, the
same pressure differential be maintained and in the same direction as exists during
the actual use of the part. For example, a vacuum system is tested with a vacuum
inside the chamber, while a compressed air cylinder should be tested with a high
pressure inside the cylinder.
There are two general concerns when leak testing. One is the location of leaks and
the other is the measurement of the total leakage rate of the part, as some leakage
may be acceptable. In many cases, parts may be first tested to determine if they
pass an acceptable level, and if not, the part may be taken off line and subjected to
a second test with the intent of locating the leak. Additionally, many parts may be
tested in batches. If a batch fails, the individual parts in that batch may then be
tested separately to identify the leaking part(s).
Agilent Helium Leak Detector User Manual
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