Repair of helium leak detector

Professional provision of AgilentRepair of helium leak detectorMass spectrometer leak detectors are widely used in fields such as pressure vessels, aerospace, atomic energy, power plants, refrigeration industry, etc. due to their high detection sensitivity, fast reaction speed, and accurate positioning and quantification. During the use of helium mass spectrometer leak detectors, some malfunctions or phenomena often occur, which can affect the normal progress of leak detection work. If ignored, it can also endanger the service life of the leak detector. Some of these faults or phenomena can be solved or avoided by users in a timely manner. Mastering and understanding the maintenance techniques for common faults of leak detectors is beneficial for the smooth progress of leak detection work and equipment maintenance. This article takes the helium mass spectrometer leak detector as an example to introduce the working principle and structural composition of this type of leak detector, analyze the handling methods of five common faults of the leak detector, and summarize the key points to pay attention to during the use of the leak detector.

Repair of helium leak detectorMalfunctions and Handling

1. Internal leakage of leak detector

(1) Internal sealing structure

When there is a leak inside the leak detector, it will cause significant interference to the leak detection work, which can easily lead to false detection and misjudgment. The main sealing part inside the helium mass spectrometer leak detector is located behind the leak detector, above the heat shield.

① The connection between the leak detector test port and the valve module is sealed with glue. If the leak detector encounters strong vibrations during transportation, it is easy for the sealant to crack at this location.

② The connection points between each solenoid valve and valve component. The sealing method uses fluororubber rings or metal gaskets for sealing. The sealing life of rubber rings is limited, and there may be sealing failure when used for more than 5 years.

③ The sealing parts at the interfaces of each component. Metal gasket sealing or rubber ring sealing between interfaces such as amplifiers and mass spectrometry chambers, ion sources and mass spectrometry chambers, molecular pumps and mass spectrometry chambers, standard leak holes and valve components, vacuum gauges and valve components, etc.