Adixen ASM 142, User Manual

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G 400
Long distance sniffer probe user manual
GB
01962
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Filter exchange
(continued)
When you change the filter, we recommend cleaning the needle and
the nipple (sniffer probe with rigid nipple only):

Take out the needle with needlenose pliers.

Clean delicately the needle with alcohol and a lint-free cloth.

Clean the rigid nipple with alcohol and compressed dry air.

Put back the needle.

Put back the filter with its screw: torque < 1 N.m.
Needle replacement
With this kind of sniffer probe, it is normally not necessary to change
the needle.
For every needle replacement in a sniffer probe, put a new needle
with the same diameter as the old needle.
3 methods can be used for the new needle adjustment :
1
flowmeter use
2
standard sniffer probe use
3
old needle use
Recommended methods
1
Flowmeter use in order to
measure the flow in the sniffer
probe
2
Standard sniffer probe use as
reference
Assembly to do:
Helium leak
detector P < 10 mbar
or
Flowmeter
0/100 sccm
Pump
Sniffer probe
connected to
the assembly
This method requires keeping a new
sniffer probe as a standard probe.
Do an auto-calibration in sniffing
mode with the standard sniffer
probe.
Do a measure of the He in the air
with the standard sniffer probe.
Cut the new needle to 85 mm/3.35 inch. Prepare it (see below “
3
Use of
the old needle as a reference“, picture
3
) and put it correctly in the nozzle
(see “Needle exchange” §).
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