Adixen ASM 142, Руководство пользователя

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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
Type
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
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