Neutral gas purge and inlet vent
connection
Use
Neutral gas
purge
Used to limit the leak
detector
internal pollution.
Used to
accelerate
the cleanup of the helium background noise in
the
pumps
after detecting a significant leak.
Make high
sensitivity testing
easier due to the decreasing and
stabilization of the helium background noise.
As a
supplement
to the neutral gas purge,
use
the “Depollution”
function
C
560 (except ASM 142 S/ASM 102 S).
CAUTION
In
case
of a big flow of Helium into the leak
detector
(very
big
leak
detected),
the recovery time (time for the display to go
back to normal Helium background value) is 10
times
longer
when the neutral gas purge is obturated than when it is open.
In usual average
test conditions,
there is however no major
difference.
Inlet
vent
Used to
accelerate
the cleanup of the helium background noise in
the leak
detector
after detecting a significant leak.
Make high
sensitivity testing
easier due to the decreasing and
stabilization of the helium background noise.
Allows to regulate the gas flow inside the leak detector, leak
detector
in stand-by.
Gas
characteristics
T
ype
Quality/purity
Use pressure
Nitrogen is typically the neutral gas
used
but you can
use
any gas on
the condition that it is poor in helium
(concentration
≤ 1 ppm).
Take
care with the ambiant air: it should not be polluted with helium.
According to the installation or item to
test. The
gas should be clean,
dry, without dust, no toxic.
0.3 ± 0.1 bar relative (≈ 20 psia/5 psig).
If the inlet vent
pressure
is too high, the inlet valve will always
stay
closed,
off even if the inlet valve is
"ON".
Purge
flow
ASM 122 D
-
ASM 142 D: ≤ 5 sccm
ASM 182 TD+: ≤ 50 sccm
2
/2
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