GB 03302 - Edition 03 - July 12
7/11
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 hydrogene).
m/e = atomic mass of the particle/number of electrons lost on
ionization.
The principle of magnetic deflexion 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 310 Operating instructions
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