Principle of vacuum helium mass spectrometry leak detection

Principle of Helium Mass Spectrometry Leak Detection by the Vacuum Method:

When using the vacuum method for leak detection, an auxiliary vacuum pump or a leak detector is required to evacuate the internal sealed chamber of the product to be inspected. Helium gas is applied to the outer surface of the product to be inspected by means of a helium hood or spraying. When there are leak holes on the surface of the product to be inspected, helium gas will enter the interior of the product through the leak holes and then enter the helium mass spectrometry leak detector, thus enabling the measurement of the leakage rate of the product to be inspected. According to the different methods of applying the leakage gas, the vacuum method can be divided into the vacuum spraying method and the vacuum helium hood method. In the vacuum spraying method, helium gas is sprayed onto the outer surface of the product to be inspected by means of a spray gun, which can locate the leak holes. In the vacuum helium hood method, a helium hood with a certain sealing function is used to cover the entire product to be inspected, and the hood is filled with helium gas at a certain concentration, which can realize the measurement of the total leakage rate of the product to be inspected.

What are the advantages of leak detection by the vacuum method? The advantages of the vacuum method are high detection sensitivity, the ability to locate leak holes, and the capability to detect leaks in large containers or products with complex structures.

Disadvantages of leak detection by the vacuum method: The disadvantage of the vacuum method is that it can only detect the leakage rate under a pressure difference of one atmosphere and cannot truly reflect the actual leakage state of the pressurized product to be inspected.

Applications: The detection by the vacuum method is mainly applied to products that require vacuum sealing performance but do not operate under pressure, such as space moving parts, liquid hydrogen tank trucks, environmental simulation equipment, etc.

The above is the introduction by Anhui Nuoyi Technology Co., Ltd. of the principle of helium mass spectrometry leak detection by the vacuum method. If you want to learn more about other information of helium mass spectrometry, you can continuously pay attention to the official website of Anhui Nuoyi Technology Co., Ltd., or call to consult for more details: 400-1677-880!