GB 00008 - Edition 05 - February 02
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Alcatel Vacuum Technology France - ATH 200 User’s Manual
A 400
Testing methods
Leak detection is used to detect micro-openings, porosities, etc. in test
parts. The detection of these cracks involves the use of a light tracer
gas, which is capable of infiltrating the smallest leak quickly: Helium.
The detector samples and measures the helium flow rate entering the
test part via the leak(s).
The testing method is selected according to the test part and the
measurement accuracy required:
The part can
be connected to
an evacuation line
The part is sealed
BOMBING method
The sensitivity is limited by the
internal dead volume of the part as
well as on the bombing time and the
pressurization value.
Global test without possible location
of the leak.
SPRAY method
laeak rate measurement from 10
-10
to 10
-1
mbar. l/s and possibility of
locating the leak.
SNIFFING method
Minimum detectable leak of 10
-6
mbar.l/s and possibility of locating
the leak.
Its characteristics
allow it to be
evacuated
Its characteristics
allow it to be
pressurized with helium
or a mixture containing
helium
Its characteristics
allow it to be placed
in a vacuum
vessel
yes
yes
yes yes
no
no
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