There are vacuum equipment of leak detection in helium mass spectrometer, one is conventional leak detection, the other is reverse diffusion leak detection. The theory of inverse diffusion is proven in the determine. The reverse diffusion leak detection is to connect the analyzed piece to a single end of the outlet of the molecular pump, and the leaked helium enters the mass spectrometer tube mounted in the air inlet stop of the pump from the outlet of the molecular pump towards the exhaust path of the pump and is detected.This leak detection strategy is based mostly on the diverse compression ratio (the ratio of the strain at the outlet of the molecular pump to the strain at the inlet) of the molecular pump for distinct mass of fuel, that is to say, it is developed with various degrees of reverse diffusion of distinct gases.The reverse diffusion leak detection method makes it possible for substantial interior pressure of the inspected areas. vacuum flange sfj-231 / 241 helium mass spectrometer leak detector can reach 1000Pa (typically, the conventional leak detector is underneath .05pa). Coating Equipment is ideal for the detection of massive containers or units with huge leakage, and it is also appropriate for the detection of suction gun leak. The reverse diffusion method also has the positive aspects of not effortless to be polluted and long filament existence.View a lot more vacuum elements at www.labideal.com.