Adixen ASM GRAPH D+ - Sniffer Method

A 400
T esting methods
GB
00008
-
Edition 05
-
February
02
Sniffer method
(outboard testing)
The test part is pressurized with helium. The detector, via an LDS (Long
Distance Sniffer)
probe, samples the helium escaping from the par t.
Global test
Local sniffing test
or
He He
par t
LDS
detector
part
detector
LDS
The part is placed under a
cover containing a sniffer
probe.
The leak cannot be
located.
The helium from the leak
accumulates over time inside
the
cover. The detector
measures
the concentration of helium.
The sniffer probe is moved
over
areas likely to contain leaks.
The leak can be
located.
The signal supplied by the
analyzer is not a direct
measurement of the leak.
The sniffer probe only
samples
part of the helium escaping
from the part. The sample
depends on the distance
separating the leak from the tip
of the
probe.
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