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A Division of Nagano Keiki Group
Atmospheric pressure chamber type and vacuum chamber type can be selected with this helium leak test system. It also can be combined with a recovery unit, concentration meter and mixer.
Two types of test methods:
This helium leak test system supports works of large sizes. Chamber size: Maximum diameter 300 （□ 300） × 1200mm
The helium leak test system is a test system optimum for leak inspections with high accuracy or of high pressure. This test system uses helium gas as the detection gas (tracer gas) and detects leaked helium. It is the leak test type capable to detect the minutest leak among FUKUDA leak testers.
Fukuda > Leak Tester >Helium Leak Test System
A leak is detected through the helium leak test by charging helium gas to the tested work and passing the leaked gas through the mass analyzer tube to detect helium only.
Helium is used for the gas to be charged in the tested work. For concentration, helium gas of 100% as well as dilute gas can be used. In addition, the used helium gas can be collected and used again since helium gas is costly.
Principle of Detection
The leaked helium gas is ionized by the electron beam from the filament within the ion chamber of the analyzing tube. The ions are accelerated and move out through a slit and then pass through the magnetic field generated by the analyzer. Since the circular trajectories of the ions depend on their mass, the collector can catch only the helium ions and detect helium.
[Figure] Principle of Helium Leak Test
The bell jar method is widely applied for the helium leak test.
In the bell jar method, helium gas is charged by depressurizing the work so that the concentration of helium gas is not decreased by atmospheric pressure. Gas in the chamber is sucked to detect leaked helium and judged by the detector. Helium inside the work is discharged and cleaned with nitrogen gas.
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