Helium mass spectrometer leak detector unit is kg.
Helium mass spectrometer leak detector, for the gas industry terminology, using helium or hydrogen as a leak detection gas, gas analyzers to detect the helium leak detection mass spectrometer. Helium's low background noise, molecular weight and viscosity coefficient is small, so it is easy to pass through the leakage hole and easy to diffuse; in addition, helium is an inert gas, does not corrode the equipment, so helium is often used as a leak detection gas.
Working Principle of Helium Mass Spectrometer
Helium mass spectrometry is an indispensable technology in the field of vacuum leak detection. It is widely used in the leak detection of resistance furnace due to the high leak detection efficiency, simple and easy to operate, sensitive response of the instrument, high precision, and not easy to be affected by the interference of other gases. Helium Mass Spectrometer is a gas-tightness testing instrument based on the principle of mass spectrometry, using helium as the leak detection gas.
By the ion source, analyzer, collector, cold cathode ionization gauge composed of mass spectrometry chamber and pumping system and electrical components. The electrons emitted from the filament in the mass spectrometry chamber oscillate back and forth in the chamber and collide with the gas in the chamber and the helium gas entering the chamber through the leakage holes to ionize them into positive ions, which enter the magnetic field under the action of the accelerating electric field.
Deflection due to the Lorentz force, the formation of arc-shaped track, change the accelerating voltage can make different masses of ions through the magnetic field and receiving slit to the receiving pole and be detected. The helium spray method and the helium absorption method are the two most common methods used by helium mass spectrometry leak detectors in resistance furnace leak detection.