Pressure Testing Method (Inside-Out) - Agilent Technologies Helium User Manual

Technical Information

Pressure Testing Method (Inside-out)

In this technique, the part is pressurized with helium or a mixture of helium and air,
and tested by one of the following methods.
Measuring Leaks
To determine the total quantity of leakage (but not the number or location of leaks),
the part is pressurized with helium (or a mixture of helium and air or nitrogen).
This can be done by bombing or backfilling small hermetically sealed parts. Larger
parts can be actively pressurized using a hose or tubing to deliver the helium. The
part is placed in a volume that is then evacuated by the leak detector. All the helium
escaping from the part is captured and quantified (see the following figure).
Figure 92 Measuring Leaks: Inside Ou
Agilent Helium Leak Detector User Manual
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