GB 04269 - Edition 05 - July 12
7/10
A 200
About leak detection
Analyzer cell
operating principle
The analyzer cell works on the principle of mass spectrometry and is
set by default to the mass of helium (m/e = 4). Other gasses can be
used (helium 3 or hydrogen).
m/e = atomic mass of the particle/number of electrons lost on
ionization.
The principle of magnetic deflection spectrometry is as follows.
The molecules of the gas being analyzed pass into an ionization
chamber
4
where they are bombarded by an electron beam
generated by a heated iridium filament
5
. A large number of the
molecules are transformed into ions.
6
He
2.5V
3 A
He
He
He
He
Stabilized power supply
Amplifier
He Leak Signal
4
5
1
"Heavy" ions
Electrons beam
"Light" ions
Helium ions
2
3
TARGET
+ 140 V adjustable
1
Triode electrode
2
Diaphragm
3
Braking electrode
4
Ionization chamber
5
Iridium filament
6
Spare filament
Magnetic field
Description
adixen Vacuum Products - ASM 380 Operating instructions
Summary of Contents for adixen ASM 380
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