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14
2022
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11
How does leak testing work on an Alloy 904L Reactor vacuum manifold
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There are three main types of leak detection for Alloy 904L Reactor vacuum chamber: helium mass spectrometry leak detection, vacuum mud sealing detection method, and vacuum gauge leak detection method.
There are three main types of leak detection for Alloy 904L Reactor vacuum chamber: helium mass spectrometry leak detection, vacuum mud sealing detection method, and vacuum gauge leak detection method. The following is a detailed introduction to the helium mass spectrometry leak detection method.
Helium mass spectrometry leak detection is a very important skill. Because of its high leak detection efficiency, simple operation, sensitive instrument response, high precision, and not easily interfered by other gases, it has been widely used in Alloy 904L Reactor vacuum chamber leak detection. The helium mass spectrometer leak detector is an air tightness testing instrument made of helium as the leak gas according to the principle of mass spectrometry.
It consists of analyzer, ion source, analyzer, cold cathode ionization gauge, collector, mass spectrometry chamber, exhaust system and electrical parts. The electrons emitted by the filament in the mass spectrometry chamber oscillate back and forth in the chamber, and collide with the chamber gas and the helium gas that enters the chamber through the leak hole to ionize them into positive ions. These helium ions enter the magnetic field under the action of the accelerating electric field and Under the action of Lorentz force, it deflects, and then forms an arc-shaped orbit. Changing the accelerating voltage can make different ions pass through the magnetic field and the receiving slit to reach the receiving pole and be detected. Among them, helium injection method and helium absorption method are two commonly used methods for helium mass spectrometry leak detection in Alloy 904L Reactor vacuum chamber.
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