Agilent Technologies Helium Leak Detector
160
DRAFT 12
/11/17
B.3.1 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:
B.3.1.1 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 (Figure B-3).
Figure B-3 Locating Leaks: Outside In
B.3.1.2 Measuring Leaks
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 (Figure B-4).
Figure B-4 Measuring Leaks: Outside In
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