Over
view
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
no
The part is
sealed
yes
Its
characteristics
allow it to
be
evacuated
Its
characteristics
no
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
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.
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.
1
/4
To Next Page
Loading...
