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Technical Information
Vacuum Testing Method (Outside-in)
The part to be tested is evacuated with a separate pumping system for large
volumes, or with just the leak detector itself. When the appropriate cross over
pressure has been reached, the leak detector is valved-in or transfers into test and
the part is tested using one of the following methods:
Locating Leaks
To pinpoint the location of the leak(s) (but not measure the total leakage rate),
helium is administered to the suspected leak sites of the part using a spray probe
with an adjustable flow (see the following figure).
Figure 90 Locating Leaks: Outside In
Measuring Leak
To determine the total quantity of leakage (but not the number or location of leaks),
the part is connected to the leak detector and shrouded by a helium environment.
This helium environment can be contained in many methods ranging from a simple
plastic bag to more complex bell jar arrangements (see the following figure).
Figure 91 Measuring Leaks: Outside In
164
Mount Test
Part
Agilent Helium Leak Detector User Manual
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