Detecting systems - hellium detector
| The main component of the whole system is a helium detector using a mass spectrometer detecting molecules of helium. This method of leak detection is initiated when a tracer gas, helium, is introduced to a test part that is connected to the MSLD system. The helium leaking from the test part diffuses through the system, its partial pressure is measured, and results are displayed on a meter. The delay in response to helium is given by the ratio of functional residual volume of the chamber and effective pumping speed of the hellium detector. |  |
| Principle of mass spectrometer in helium leak detector (MSLD = Mass Spectrometer Leak Detector) MSDL operating principle consists of ionization of gases in a vacuum and accelerating of the various ions through a voltage drop and a magnetic field. The helium ions are separated and collected, and the resulting ion current is amplified and indicated on the meter. An MSLD consists of:
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